Transcript
GB/T 1220—2007
ICS 77. 140. 20 H 40
GB National Standard of the People’s Republic of China GB/T 1220—2007 In place of GB/T 1220—1992 __________________________________________________ ________________________ _____________________________________________________ _____________________________ __
Stainless Steel Bars
不锈钢棒
Issued on 14-05-2007
implemented on 01-12-2007
By General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China and Standardization Administration Committee of the People's Republic of China
GB/T 1220—2007
Forward This Standard is to be implemented in place of GB/T 1220—1992: Stainless steel bars. In comparison with Standard GB/T 1220—1992, the alterations of this Standard include the following points:
It has added “Technical terms and definitions” and “Contents in order sheet” (See Chapter 3 and Chapter 4 hereof);
“Dimensions, contour, weight and permissible deviation” is changed to direct quotation of stipulations specified in universal basic standard (Chapter 4 of 1992 edition; Chapter 6 of this edition);
It has cancelled 6 grades, including 1Cr18Mn10Ni5Mo3N, 1Cr18Mn12Mo2Ti, 0Cr18Ni12Mo2Ti, 0Cr18Ni12Mo2Ti, 1Cr18Ni5Mo12Mo3Ti, 1Cr18Ni9Ti and 0Cr26Ni5Mo2, etc (Table (Table 2 and Table Table 3 of 1992 Edition);
It has added 6 grades and their properties, in including 022Cr18Mn22Ni5Mo3N, 022Cr23Ni5Mo3N,
022Cr25Ni6Mo2N,
03Cr25Ni6Mo3Cu2N,
17Cr16Ni2
and
05Cr15Ni5Cu4Nb, etc (See Table 2 and Table 7, Table 4 and Table 9, Table 5 and Table 10 hereof);
It has adjusted the chemical compositions and phosphonium content of 21 steel grades (serial numbers: 1, 3, 13, 17, 23, 25, 35, 38, 39, 41, 43, 44, 52, 55, 62, 68, 93, 85, 98, 137 and 139) based on universal international steel grade (Table 2 in 1992 Edition and Tables 1 ~ 5 in this Edition);
It has modified “Smelting method” that it shall apply initial molten steel plus out-of-furnace refining process process in priority (Article 5.2 of 1992 edition and Article 7.2 of this edition);
“Delivery state” is changed from “It may not be treated if it is required by the Buyer” into “It may not be treated through negotiations between the Supplier and the Buyer”, while for precipitation-hardening stainless steel bars it has added that annealing treatment to the delivery can be chosen by steel texture
(Article 5.3 of 1992 edition
and Article 7.3 of this edition);
For “Surface quality” it has added that “It may specify to remove scales formed from heat treatment by way of pickling, turning or other methods through negotiations between the Supplier and the Buyer, which should be indicated in contract” (Article 7.8.3 of this edition);
The heat treatment system for all kinds of stainless steel bars or test pieces is separated from mechanical property table and listed into Appendix A (Informative appendix) (Table 3 ~ Table 5 of 1992 edition; Table A.1 ~ Table A.5 of this edition);
The yield strength for martensite and precipitation-hardening stainless steel is changed to necessary inspection indicator (Article 5.4.1.1 of 1992 edition; Table 9 and Table 10 of this edition);
For 022Cr19Ni5Mo3Si2N(00Cr18Ni5Mo3Si2) steel, it has added that Brinell hardness value HBW shall be no more than 290 (Table (Table 3 of 1992 edition; Table 7 of this edition);
For 12Cr13(1Cr13) steel it has added that the lower limit of carbon content shall be 0.08%, while its percentage elongation after fracture is adjusted from 25% to 22% (Table 2 and Table 4 of 1992 edition; Table 4 and Table 9 of this edition);
GB/T 1220—2007
Forward This Standard is to be implemented in place of GB/T 1220—1992: Stainless steel bars. In comparison with Standard GB/T 1220—1992, the alterations of this Standard include the following points:
It has added “Technical terms and definitions” and “Contents in order sheet” (See Chapter 3 and Chapter 4 hereof);
“Dimensions, contour, weight and permissible deviation” is changed to direct quotation of stipulations specified in universal basic standard (Chapter 4 of 1992 edition; Chapter 6 of this edition);
It has cancelled 6 grades, including 1Cr18Mn10Ni5Mo3N, 1Cr18Mn12Mo2Ti, 0Cr18Ni12Mo2Ti, 0Cr18Ni12Mo2Ti, 1Cr18Ni5Mo12Mo3Ti, 1Cr18Ni9Ti and 0Cr26Ni5Mo2, etc (Table (Table 2 and Table Table 3 of 1992 Edition);
It has added 6 grades and their properties, in including 022Cr18Mn22Ni5Mo3N, 022Cr23Ni5Mo3N,
022Cr25Ni6Mo2N,
03Cr25Ni6Mo3Cu2N,
17Cr16Ni2
and
05Cr15Ni5Cu4Nb, etc (See Table 2 and Table 7, Table 4 and Table 9, Table 5 and Table 10 hereof);
It has adjusted the chemical compositions and phosphonium content of 21 steel grades (serial numbers: 1, 3, 13, 17, 23, 25, 35, 38, 39, 41, 43, 44, 52, 55, 62, 68, 93, 85, 98, 137 and 139) based on universal international steel grade (Table 2 in 1992 Edition and Tables 1 ~ 5 in this Edition);
It has modified “Smelting method” that it shall apply initial molten steel plus out-of-furnace refining process process in priority (Article 5.2 of 1992 edition and Article 7.2 of this edition);
“Delivery state” is changed from “It may not be treated if it is required by the Buyer” into “It may not be treated through negotiations between the Supplier and the Buyer”, while for precipitation-hardening stainless steel bars it has added that annealing treatment to the delivery can be chosen by steel texture
(Article 5.3 of 1992 edition
and Article 7.3 of this edition);
For “Surface quality” it has added that “It may specify to remove scales formed from heat treatment by way of pickling, turning or other methods through negotiations between the Supplier and the Buyer, which should be indicated in contract” (Article 7.8.3 of this edition);
The heat treatment system for all kinds of stainless steel bars or test pieces is separated from mechanical property table and listed into Appendix A (Informative appendix) (Table 3 ~ Table 5 of 1992 edition; Table A.1 ~ Table A.5 of this edition);
The yield strength for martensite and precipitation-hardening stainless steel is changed to necessary inspection indicator (Article 5.4.1.1 of 1992 edition; Table 9 and Table 10 of this edition);
For 022Cr19Ni5Mo3Si2N(00Cr18Ni5Mo3Si2) steel, it has added that Brinell hardness value HBW shall be no more than 290 (Table (Table 3 of 1992 edition; Table 7 of this edition);
For 12Cr13(1Cr13) steel it has added that the lower limit of carbon content shall be 0.08%, while its percentage elongation after fracture is adjusted from 25% to 22% (Table 2 and Table 4 of 1992 edition; Table 4 and Table 9 of this edition);
GB/T 1220—2007
For 30Cr13(Y3Cr13) steel, its percentage elongation after fracture is adjusted from 12% and 40% to 8% and 35% (Table (Table 4 of 1992 edition; Table 9 of this edition);
The original yield strength
value for some martensite steels (No. 18, 22, 26, 39, 46,
σ 0.2
50 and 52) and 06Cr13Al(0Cr13Al) is adjusted from 177Mpa to proof strength at 2
non-proportional extension R extension RP0.2 value to be 175 N/mm (Table 3 of 1992 edition; Table 6 and Table 8 of this edition);
The yield strength
value for 022Cr12(00Cr12) steels is adjusted from 196MPa to
σ 0.2
2
proof strength at non-proportional extension R extension RP0.2 value to be 195 N/mm , while tensile 2
strength is adjusted from 365MPa to 360N/mm (Table 3 of 1992 edition; Table 8 of this edition);
The tensile strengths Rm for 20Cr13 (2Cr13) and 13Cr13 (1Cr13Mo) are adjusted 2
2
respectively from 635MPa and 685MPa to 640N/mm and 690N/mm (Table 4 of 1992 edition; Table Table 9 of this edition);
It has cancelled the stipulations on section shrinkage rate of flat steel (Table 3 ~ Table Table 5 of 1992 edition; notes of Table 6 to Table 10 of this edition);
“Corrosion resistance” is changed to an item in agreement, where it has cancelled the two test methods contained in GB/T 4334.4 and GB/T 4334.6, while for the test condition of 06Cr19Ni13Mo3 (0Cr19Ni13Mo3) it has added “Sensitizing treatment” (Article 5.5 of 1992 edition; Article 7.5 of this edition);
For “Surface quality” it has added that “It may specify to remove scales formed from heat treatment by way of pickling, turning or other methods through negotiations between the Supplier and the Buyer, Buyer, which should be indicated in contract” (Article 5.8 of 1992 edition; Article 7.8 of this edition);
It has clearly specified the sampling positions in “Macro strcture” and “Tower shape” for inspection of continuous casting steel and the sampling quantity for “Corrosion resistance” test (Article 12 of 1992 edition; Article 16 of this edition);
It has cancelled “Check list for stainless steel grades of this Standard and stainless steel grades of each country” and changed to direct quotation of GB/T 20878: Stainless steel and heat-resisting steel –Grade and chemical compositions compositions (Appendix B of 1992 edition; Table Table 1 ~ Table 5 of this edition).
The Appendix A and Appendix B of this Standard are informative appendixes. This Standard is proposed by China Iron and Steel Association. This Standard is governed by National Technical Committee of Standardization for Iron and Steel. The main drafting units of this Standard include China Metallurgical Information and Standardization Standardization Institute and Liaoning Dongbei Special Steel Group Co., Ltd.. The major drafters of this Standard include Luan Yan, Dai Qiang, Gu Qiang, Zeng Wentao and Liu Baoshi. Versions issued in history to be substituted by this Standard include: ---------GB/T 1220—1975, GB/T 1220—1984, GB/T 1220—1992.
GB/T 1220—2007
Contents 1.
Scope.........................................................................................................................................1
2.
Normative documents quoted ...................................................................................................1
3.
Technical terms and definitions ................................................................................................4
4.
Contents in order sheet.............................................................................................................. 4
5.
Classification.............................................................................................................................4
6.
Dimension, contour, weight and permissible tolerance.............................................................4
7.
Technical requirements .............................................................................................................5
8.
Test methods ........................................................................................................................... 21
9.
Inspection rules .......................................................................................................................22
10.
Packing, marking and quality certificate.............................................................................22
Appendix A ....................................................................................................................................23
(Informative appendix) ................................................................................................................... 23 Typical heat treatment regulations for stainless steel bars or test pieces .................................23 Appendix B ....................................................................................................................................27
(Informative appendix) ................................................................................................................... 27
GB/T 1220—2007
1.
Scope This Standard has stipulated the dimensions, contour, technical requirements , test methods, inspection rules, packing marks and certificate quality, etc, of stainless steel bars (generic terms of round steel, square steel, flat steel, hexagonal steel and octagonal steel, hereinafter refer to as “Steel bar”). This Standard is applicable to the hot rolled and forged steel bars that the dimension (diameter, side length, thickness or subtense distance, hereinafter refer to as “Dimension”) is no more than 250mm. Through negotiations of both the Supplier and Buyer, it may also supply the hot rolled and forged steel bars that the dimension is more than 250mm.
2. Normative documents quoted
Articles contained in the following documents have become articles of this Standard after they are quoted. For the dated documents so quoted, all their modifications made thereafter (excluding corrections) or revised versions shall not be applicable to this Standard, but all parties who have reached agreements on the basis of this Standard are encouraged to study on the implementation of the latest versions of these document. For the undated documents so quoted, their latest versions shall be applicable to this Standard. GB/T 222 Permissible tolerances for chemical composition of steel products GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The Diantipyrylmethane Phosphomolybdate Gravimetric Method for the Determination of phosphonium content GB/T 223.4 Methods for chemical analysis of iron, steel and alloy - The volumetric method for determination of manganese content by ammonium nitrate oxidation GB/T 223.5 Methods for chemical analysis of iron, steel and alloy – The reduction type silicomolybdic acid spectrophotometric method for the determination of acid-soluble silicon content GB/T 223.8 Methods for chemical analysis of iron, steel and alloy –The sodium fluoride separation-EDTA titration method for the determination of aluminium content GB/T 223.9 Methods for chemical analysis of iron, steel and alloy –The chromazurine S spectrophotometric method for the determination of aluminium content GB/T 223.11 Methods for chemical analysis of iron, steel and alloy –The ammonium persulphate oxidation volumetric method for the determination of chrome content GB/T 223.14 Methods for chemical analysis of iron, steel and alloy –The tantalum reagent extraction spectrophotometric method for the determination of vanadium content GB/T 223.16 Methods for chemical analysis of iron, steel and alloy –The chromotropic acid spectrophotometric method for the determination of titanium content GB/T 223.17 Methods for chemical analysis of iron, steel and alloy –The diantipyrylmethane spectrophotometric method for the determination of titanium content GB/T 223.18 Methods for chemical analysis of iron, steel and alloy – The sodium thiosulfate separation - iodine volumetric method for the determination of cuprum content GB/T 223.23 Methods for chemical analysis of iron, steel and alloy – The dimethyl glyoxime spectrophotometric method for the determination of nickel content GB/T 223.25 Methods for chemical analysis of iron, steel and alloy – The dimethyl glyoxime gravimetric method for the determination of nickel content GB/T 223.26 Methods for chemical analysis of iron, steel and alloy – The thiocyanate direct spectrophotometric method for the determination of molybdenum content
GB/T 1220—2007
GB/T 223.28 Methods for chemical analysis of iron, steel and alloy – The alpha-Benzoin oxim gravimetric method for the determination of molybdenum content GB/T 223.36 Methods for chemical analysis of iron, steel and alloy – The distillation separation - neutralization titration method for the determination of nitrogen content GB/T 223.37 Methods for chemical analysis of iron, steel and alloy – The distillation separation - indophenol blue spectrophotometric method for the determination of nitrogen content GB/T 223.40 Determination of niobium content in iron, steel and alloy – The sulfochlorophenol S spectrophotometric method GB/T 223.52 Methods for chemical analysis of iron, steel and alloy –The hydroxylamine hydrochloride - iodine gravimetric method for the determination of selenium content GB/T 223.58 Methods for chemical analysis of iron, steel and alloy –The sodium arsenite sodium nitrite titration method for t he determination of manganese content GB/T 223.59 Methods for chemical analysis of iron, steel and alloy –The molybdenum blue photometric method for the determination of phosphonium content GB/T 223.60 Methods for chemical analysis of iron, steel and alloy –The perchloric acid dehydration method for the determination of silicon content GB/T 223.61 Methods for chemical analysis of iron, steel and alloy –The ammonium phosphomolybdate volumetric method for the determination of phosphonium content GB/T 223.62 Methods for chemical analysis of iron, steel and alloy –The Butyl Acetate extraction photometric method for the determination of phosphonium content GB/T 223.63 Methods for chemical analysis of iron, steel and alloy –The sodium periodate (potassium periodate) photometric method for the determination of manganese content (GB/T 223.63 – 1998, neq ISO R 629) GB/T 223.64 Methods for chemical analysis of iron, steel and alloy –The flame atom absorption spectral method for the determination of manganese content GB/T 223.67 Methods for chemical analysis of iron, steel and alloy –The potassium iodate titration method after combustion in the pipe furnace for determination of phosphonium content GB/T 223.68 Methods for chemical analysis of iron, steel and alloy –The gas volumetric method after combustion in the pipe furnace for determination of carbon content GB/T 223.71 Methods for chemical analysis of iron, steel and alloy –The gravimetric method after combustion in the pipe furnace for determination of carbon content GB/T 223.72 Methods for chemical analysis of iron, steel and alloy –The aluminium oxide color layer separation - barium sulfate gravimetric method for determination of phosphonium content GB/T 226 Etch test for macrostructure and defect of steels (GB/T 226 – 1991, neq ISO4969: 1980, Steel – Macroscopic examination by etching with strong mineral adids) GB/T 228 Metallic material – Greenhouse tension test method (GB/T 228 –2002, eqv ISO 6892: 1998) GB/T 229 Metal – Charpy impact test method (GB/T 229 –1994, eqv ISO 83: 1976, Steel – Charpy impact test (U-notch), eqv ISO 148; 1983, Steel – Charpy impact test (V-notch)) GB/T 230.1 Metal –Rockwell hardness test, Part I: Test method (A, B, C, D, E, F, G, H, K, N, T measuring scales) (GB/T 230.1 – 2004, ISO 6508: 1999, MOD) GB/T 231.1 Metal –Brinell hardness test, Part I: Test method (GB/T 231.1 – 2002, eqv ISO
GB/T 1220—2007
6506-1: 1999) GB/T 702—2004 Metal – Hot-rolled round steel and square steel – Dimension, contour, weight and permissible tolerance (GB/T 702—2004, ISO 1035-1: 1980, Hot-rolled steel bar – Part 1: Dimension of round bars, ISO1035-2: 1980, Hot-rolled steel bar – Part 1: Dimension of square bars, ISO1035-4: 1982, Hot-rolled steel bar – Part 4:Tolerances, MOD) GB/T 704—1988 Metal – Hot-rolled flat steel – Dimension, contour, weight and permissible tolerance GB/T 705—1985 Metal – Hot-rolled hexagonal steel and octagonal steel
– Dimension,
contour, weight and permissible tolerance GB/T 908—1987 Metal – Forged round steel and square steel
– Dimension, contour,
weight and permissible tolerance GB/T 1979 Standard diagrams for macrostructure and defect of structural steels GB/T 2101 General requirements of acceptance, packaging, marking and certification for section steel GB/T 2975 Steel and steel products--Location and preparation of test pieces for mechanical testing (GB/T 2975 – 1998, eqv ISO 377: 1997) GB/T 4334.1 Stainless steel – 10% oxalic acid etch test method GB/T 4334.2 Stainless steel –sulfuric acid - ferric sulfate corrosion test method GB/T 4334.3 Stainless steel – 65% nitric acid corrosion test method GB/T 4334.5 Stainless steel –sulfuric acid - copper sulfate corrosion test method GB/T 4340.1 Metal –Vickers hardness test, Part I: Test method (GB/T 4340.1 – 1999, eqv ISO 6507-1: 1997) GB/T 6394 Metal – Methods for determination of the average grain size GB/T 6401 – 1986 Micrographic method for determining area fraction of the alpha-phases using charts in ferritic-austenitic duplex stainless steel GB/T 7736 Ultrasonic inspecting method for macro-structure and defect of steel GB/T 9971 – 2004 Pure iron for raw material GB/T 10121 Steel products--Method for magnetic particle inspection of tower sample GB/T 10561 Determination of nonmetal inclusion content in steels -- Methods for radiographic inspection and classification of radiographs (GB/T 10561 – 2005, ISO 4967: 1998, IDT) GB/T 11170 Method for photoelectric emission spectral analysis of stainless steel GB/T 13305 – 1991 Micrographic method for determining area fraction of the alpha-phases in austenitic stainless steel GB/T 15574 Classification for steel products GB/T 15711 Steel products-Method for etch test of tower sample GB/T 16761 – 1997 Forged flat steel – Dimension, contour, weight and permissible tolerance GB/T 17505 General technical requirements on delivery of steel and steel products (GB/T 17505 –1998, eqv ISO 404: 1992) GB/T 20066 Iron and steel – Sampling and sample preparation method for determination of chemical compositions (GB/T 20066 – 2006, ISO 14284: 1996, IDT) GB/T 20878 Stainless steel and heat-resisting steel – Grades and chemical compositions YB/T 5293 Metallic materials-Forging test
GB/T 1220—2007
3.
Technical terms and definitions The technical terms and definitions established in GB/T 20878 and GB/T 15574 are applicable to this Standard.
4.
Contents in order sheet The contract for goods or order form made according this Standard shall contain the following contents: a)
Standard code;
b) Product description; c)
Grade or unified numerical code;
d) Section shape (round, square, flat, hexagonal or octagonal); e)
Dimensions and contour (see Chapter 6 hereof);
f)
Weight (or quantity);
g) Processing method used (See 5.2 hereof); h) Delivery state (See 7.2 hereof); i) 5. 5.1
Special requirements (See 7.9 hereof).
Classification By structural features, steel bars are divided into five categories, including austenite type, austenite – ferrite type, ferrite type, martensite type and precipitation-hardening type.
5.2
By application methods, steel bars are divided into two categories. Application methods of steel bars should be indicated in contract, otherwise, it shall supply the steel for the purpose of cutting processing. a)
Steel for pressing processing 1) Hot-pressing processing 2) Steel for hot-forging
6. 6.1
UHP
UHF
3) Blank for cold drawing b) Steel for cutting processing
UP
UCD UC
Dimension, contour, weight and permissible tolerance Dimension, contour, weight and permissible tolerance of hot-rolled round steel and square steel The dimension, contour, weight and permissible tolerance of hot-rolled round steel and square steel shall conform to the stipulations set forth in GB/T 702 – 2004, the concrete requirements of which should be indicated in contract. Otherwise it shall execute the second group contained in GB/T 802 – 2004 Standard.
6.2
Dimension, contour, weight and permissible tolerance of hot-rolled flat steel The dimension, contour, weight and permissible tolerance of hot-rolled flat steel shall conform to the stipulations set forth in GB/T 704 – 1988, the concrete requirements of which should be indicated in contract. Otherwise it shall execute the contract according to the common class as specified in GB/T 704 – 1998.
6.3
Dimension, contour, weight and permissible tolerance of hot-rolled hexagonal steel and octagonal steel
GB/T 1220—2007
The dimension, contour, weight and permissible tolerance of hot-rolled hexagonal steel and octagonal steel shall conform to the stipulations set forth in GB/T 705 – 1985, the concrete requirements of which should be indicated in contract. Otherwise it shall execute the contract according to the second group as specified in GB/T 705 – 1985. Dimension, contour, weight and permissible tolerance of forged round steel and square steel
6.4
The dimension, contour, weight and permissible tolerance of forged round steel and square steel shall conform to the stipulations set forth in GB/T 908 – 1987, the concrete requirements of which should be indicated in contract. Otherwise it shall execute the contract according to the second group as specified in GB/T 908 – 1987. Dimension, contour, weight and permissible tolerance of forged flat steel
6.5
The dimension, contour, weight and permissible tolerance of forged flat steel shall conform to the stipulations set forth in GB/T 16761 – 1997, the concrete requirements of which should be indicated in contract. Otherwise it shall execute the contract according to the second group as specified in GB/T 16761 – 1997. Weight
6.6
Steel bars shall be delivered by actual weight. 7.
Technical requirements
7.1 7.1.1
Grade and chemical components Steel grades, unified numerical code and chemical compositions (melting analysis) shall conform to the stipulations set forth in Table 1 ~ Table 5 hereof.
7.1.2
The permissible tolerance for chemical compositions of steel bars shall conform to the stipulations set forth in GB/T 222.
7.2
Melting method Unless it is otherwise stipulated in contract, it shall usually adopt initial molten steel plus out-of-furnace refining process.
7.3
Delivery state Steel bars can be delivered in heat-treated or non-heat-treated state and the order can select delivery state with reference to Articles 7.3.1 ~ 7.3.4 hereof, which should be indicated in contract. Otherwise, it shall deliver non-heat-treated steels. The regulations for heat treatment of all kinds of steel bars refer to Table A.1 ~ Table A.5 in Appendix A hereof.
7.3.1
Austenite type and austenite – ferrite type steel bars for cutting processing shall go through solution treatment, which can be omitted through negotiations by both the Supplier and Buyer. The steel bars for hot-pressing processing shall not go through solution treatment.
7.3.2
Ferrite type steel bars shall go through annealing treatment, which can be omitted through negotiations by both the Supplier and Buyer.
7.3.3
Martensite type steel bars shall go through annealing treatment.
7.3.4
Precipitation-hardening type steel bars can select solution treatment or annealing treatment based on steel texture, annealing regulation shall be determined by the negotiations of both Supplier and Buyer, if there is no agreement, the annealing temperature shall usually be 650℃ ~ 680℃. Precipitation-hardening type steel bars (excluding 05Cr17Ni4Cu4Nb) may not be treated through negotiations of both Supplier and Buyer.
GB/T 1220—2007
7.4 7.4.1
Mechanical properties The heat treatment regulations for all kinds of steel bars of test pieces shall refer to the stipulations set forth in Table A.1 ~ Table A.5 of Appendix A hereof. The dimension of test piece blank for heat treatment shall usually be 25mm. When the dimension of steel bar is less than 25mm, heat treatment shall be conducted on original dimension steel bars.
7.4.2
For the heat-treated steel bars (except for martensite steel subject to annealing), test pieces shall be no longer heat treated and its mechanical properties shall conform to the stipulations set forth in Table 6 ~ Table 10 hereof respectively.
7.4.3
For the non-heat-treated steel bars, the blank of test pieces shall be heat treated and its mechanical properties shall conform to the stipulations set forth in Table 6 ~ Table 10 hereof respectively.
7.4.4
The mechanical properties of precipitation-hardening type steel bars shall be indicated in contract, otherwise it shall execute the second group in contract.
7.4.5
If the Supplier can guarantee the qualification of mechanical properties, it may wholly or partially omit mechanical property test.
GB/T 1220—2007
Table 1 Chemical compositions of austenite type stainless steel Code in GB/T 20878
Unified numerical code
New grade
Original grade
Chemical compositions (mass fraction) % C
Si
Mn
P
S
Ni
Cr
Mo
Cu
N
Other elements
1 3 9 13 15 16 17 18 22 23 24 25 26 32 35 38
7
GB/T 1220—2007
Table 1 (Continued) Code in GB/T 20878
Unified numerical code
New grade
Original grade
Chemical compositions (mass fraction) % C
Si
Mn
P
S
Ni
Cr
Mo
Cu
Note 1: All the elements listed in the table shall be maximum value, unless it is otherwise indicated for range or minimum value. Value in bracket is the maximum value to put in or permissible content. Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878.
N
Other elements
GB/T 1220—2007
Table 1 (Continued) Code in GB/T 20878
Unified numerical code
New grade
Original grade
Chemical compositions (mass fraction) % C
Si
Mn
P
S
Ni
Cr
Mo
Cu
N
Other elements
Note 1: All the elements listed in the table shall be maximum value, unless it is otherwise indicated for range or minimum value. Value in bracket is the maximum value to put in or permissible content. Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878.
a
It may add the alloy elements other than this table, if necessary.
8
GB/T 1220—2007
Table 2 Chemical compositions of austenite-ferrite type stainless steel Code in GB/T 20878
Unified code
numerical
New grade
Original grade
Chemical compositions (mass fraction) % C
Si
Mn
P
Note 1: All the elements listed in the table shall be maximum value, unless it is otherwise indicated for range or minimum value. Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878.
S
Ni
Cr
Mo
Cu
N
Other elements
GB/T 1220—2007
Table 2 Chemical compositions of austenite-ferrite type stainless steel Code in GB/T 20878
Unified code
numerical
New grade
Original grade
Chemical compositions (mass fraction) % C
Si
Mn
P
S
Ni
Cr
Mo
Cu
Other elements
N
Note 1: All the elements listed in the table shall be maximum value, unless it is otherwise indicated for range or minimum value. Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878.
9
GB/T 1220—2007
Table 3 Chemical compositions of ferrite type stainless steel Code in GB/T 20878
Unified numerical code
New grade
Original grade
Chemical compositions (mass fraction) % C
Si
Mn
P
S
Ni
Cr
Mo
Cu
N
Note 1: All the elements listed in the table shall be maximum value, unless it is otherwise indicated for range or minimum value. Value in bracket is the maximum value to put in or permissible content Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878. a
It is permissible for nickel content to be less than or equal to 0.50%, copper content to be less than or equal to 0.20%, while Ni + Cu ≤0.50%m, and it may add the alloy elements other than this table, if necessary.
Other elements
GB/T 1220—2007
Table 3 Chemical compositions of ferrite type stainless steel Code in GB/T 20878
Unified numerical code
New grade
Original
Chemical compositions (mass fraction) %
grade
C
Si
Mn
P
S
Ni
Cr
Mo
Cu
Other elements
N
Note 1: All the elements listed in the table shall be maximum value, unless it is otherwise indicated for range or minimum value. Value in bracket is the maximum value to put in or permissible content Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878. a
It is permissible for nickel content to be less than or equal to 0.50%, copper content to be less than or equal to 0.20%, while Ni + Cu ≤0.50%m, and it may add the alloy elements other than this table, if necessary.
10
GB/T 1220—2007
Table 4 Chemical compositions of Martensite type stainless steel Code in GB/T 20878
Unified numerical code
New grade
Original grade
Chemical compositions (mass fraction) % C
Si
Mn
P
S
Ni
Cr
Mo
Cu
N
Note 1: All the elements listed in the table shall be maximum value, unless it is otherwise indicated for range or minimum value. Value in bracket is the maximum value to put in or permissible content Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878.
Other elements
GB/T 1220—2007
Table 4 Chemical compositions of Martensite type stainless steel Code in GB/T 20878
Unified numerical code
New grade
Original grade
Chemical compositions (mass fraction) % C
Si
Mn
P
S
Ni
Cr
Mo
Cu
Other elements
N
Note 1: All the elements listed in the table shall be maximum value, unless it is otherwise indicated for range or minimum value. Value in bracket is the maximum value to put in or permissible content Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878. a
The grade of adjusted compositions relative to GB/T 20878.
11
GB/T 1220—2007
Table 5 Chemical compositions of precipitation-hardening type stainless steel Code in GB/T 20878
Unified numerical code
New grade
Original grade
Chemical compositions (mass fraction) % C
Si
Mn
Note 1: All the elements listed in the table shall be maximum value, unless it is otherwise indicated for range or minimum value. Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878.
P
S
Ni
Cr
Mo
Cu
N
Other elements
GB/T 1220—2007
Table 5 Chemical compositions of precipitation-hardening type stainless steel Code in GB/T 20878
Unified numerical code
New grade
Original grade
Chemical compositions (mass fraction) % C
Si
Mn
P
S
Ni
Cr
Mo
Cu
Other elements
N
Note 1: All the elements listed in the table shall be maximum value, unless it is otherwise indicated for range or minimum value. Note 2: The comparison between the grades of this Standard and those of foreign standards refer to GB/T 20878.
12
GB/T 1220—2007
Table 6 Mechanical properties of austenite type steel bars or test pieces through solution treatment (See Table A.1) Code in GB/T 20878
Unified numerical code
New grade
Original grade
Proof strength, non-proporti onal extension b RP0.2 /(N/mm 2 )
Tensile strength Rm /(N/mm2)
Shrinkage rate after fracture A /%
No less than
Section shrinkage rate Zc /%
HBW
Hardness b HRB
No more than
HV
GB/T 1220—2007
Table 6 Mechanical properties of austenite type steel bars or test pieces through solution treatment (See Table A.1) Code in GB/T 20878
Unified numerical code
New grade
Original grade
Proof strength, non-proporti onal extension b RP0.2 /(N/mm 2 )
Tensile strength Rm /(N/mm2)
Shrinkage rate after fracture A /%
Section shrinkage rate Zc /%
HBW
No less than
Hardness b HRB
No more than
13
GB/T 1220—2007
Table 6 (Continued) Code in GB/T 20878
Unified numerical code
New grade
Original grade
Proof strength, non-proportional extension RP0.2 b/(N/mm2)
Tensile strength Rm /(N/mm2)
Shrinkage rate after fracture A /%
No less than
a.
Section shrinkage rate Zc /%
HBW
Hardness b HRB
HV
No larger than
This table is only applicable to the steel bars that the diameter, side length, thickness or subtense distance is less than or equal to 180mm, for the steel bars of more than 180mm, it can be forged into 180mm sample blank for test, or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties.
HV
GB/T 1220—2007
Table 6 (Continued) Code in GB/T 20878
Unified numerical code
New
Original grade
grade
Proof strength, non-proportional extension RP0.2 b/(N/mm2)
Tensile strength Rm /(N/mm2)
Shrinkage rate after fracture A /%
Section shrinkage rate Zc /%
HBW
No less than
a. b. c.
Hardness b HRB
HV
No larger than
This table is only applicable to the steel bars that the diameter, side length, thickness or subtense distance is less than or equal to 180mm, for the steel bars of more than 180mm, it can be forged into 180mm sample blank for test, or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. Proof strength, non-proportional extension and hardness shall only be tested when it is required by the Buyer (to be indicated in contract), in this case, the Supplier can select one method to determine hardness according to the dimension and state of steel bars. It is not applicable to flat steel, but w hen it is required by the Buyer, it shall be decided through negotiation of both the Supplier and Buyer.
14
GB/T 1220—2007
Table 7 Mechanical properties of austenite-ferrite type steel bars or test pieces through solution treatment (See Table A.2) Code in GB/T 20878
Unified numerical code
New grade
Original grade
Proof strength, non-proportional extension RP0.2 b/(N/mm2)
Tensile strength Rm /(N/mm2)
Shrinkage rate after fracture A /%
No less than
a. b. c. d.
Section shrinkage rate Zc /%
HBW
Hardness b HRB
HV
No more than
Table 7 is only applicable to the steel bars that the diameter, side length, thickness or subtense distance is less than or equal to 75mm, for the steel bars of more than 75mm, it can be forged into 75mm sample blank for test, or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. Proof strength, non-proportional extension and hardness shall only be tested when it is required by the Buyer (to be indicated in contract), in this case, the Supplier can select one method to determine hardness according to the dimension and state of steel bars. It is not applicable to flat steel, but w hen it is required by the Buyer, it shall be decided through negotiation of both the Supplier and Buyer. For the round steel, hexagonal steel and octagonal steel that diameter or subtense distance is less than or equal to 16mm, or for the square steel and flat steel that the thickness is less than 12mm, it shall not conduct impact test.
GB/T 1220—2007
Table 7 Mechanical properties of austenite-ferrite type steel bars or test pieces through solution treatment (See Table A.2) Code in GB/T 20878
Unified numerical code
New grade
Original grade
Proof strength, non-proportional extension RP0.2 b/(N/mm2)
Tensile strength Rm /(N/mm2)
Shrinkage rate after fracture A /%
Section shrinkage rate Zc /%
HBW
No less than
a.
Hardness b HRB
HV
No more than
Table 7 is only applicable to the steel bars that the diameter, side length, thickness or subtense distance is less than or equal to 75mm, for the steel bars of more than 75mm, it can be forged into 75mm sample blank for test, or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. Proof strength, non-proportional extension and hardness shall only be tested when it is required by the Buyer (to be indicated in contract), in this case, the Supplier can select one method to determine hardness according to the dimension and state of steel bars. It is not applicable to flat steel, but w hen it is required by the Buyer, it shall be decided through negotiation of both the Supplier and Buyer. For the round steel, hexagonal steel and octagonal steel that diameter or subtense distance is less than or equal to 16mm, or for the square steel and flat steel that the thickness is less than 12mm, it shall not conduct impact test.
b. c. d.
15
GB/T 1220—2007
Table 8 Mechanical properties of ferrite type steel bars or test pieces through annealing treatment (See Table A.3) Code in GB/T 20878
Unified numerical code
New grade
Original grade
Proof strength, non-proportional extension RP0.2 b/(N/mm2)
Tensile strength Rm /(N/mm2)
Shrinkage rate after fracture A /%
Hardness b HBW HRB
Section shrinkage rate Zc /%
HV
No less than
a. b. c. d.
a
No more than
78 83
S11348 S11203
06Cr13A1 022Cr12
0Cr13A1 00Cr12
175 195
410 360
20 22
60 60
78 --
183
85
S11710
10Cr17
1Cr17
205
450
22
50
--
183
86
S11717
Y10Cr17
Y1Cr17
205
450
22
50
--
183
88
S11790
10Cr17Mo
1Cr17Mo
205
450
22
50
--
183
94
S12791
008Cr27Mo
00Cr27Mo
245
410
20
45
--
183
95
S13091
008Cr30Mo2
00Cr30M02
295
450
20
45
183
183
Table 7 is only applicable to the steel bars that the diameter, side length, thickness or subtense distance is less than or equal to 75mm, for the steel bars of more than 75mm, it can be forged into 75mm sample blank for test, or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. Proof strength, non-proportional extension and hardness shall only be tested when it is required by the Buyer (to be indicated in contract), in this case, the Supplier can select one method to determine hardness according to the dimension and state of steel bars. It is not applicable to flat steel, but w hen it is required by the Buyer, it shall be decided through negotiation of both the Supplier and Buyer. For the round steel, hexagonal steel and octagonal steel that diameter or subtense distance is less than or equal to 16mm, or for the square steel and flat steel that the thickness is less than 12mm, it shall not conduct impact test.
GB/T 1220—2007
Table 8 Mechanical properties of ferrite type steel bars or test pieces through annealing treatment (See Table A.3) Code in GB/T 20878
Unified numerical code
New grade
Original grade
Proof strength, non-proportional extension RP0.2 b/(N/mm2)
Tensile strength Rm /(N/mm2)
Shrinkage rate after fracture A /%
HV
No less than
a. b. c. d.
a
Hardness b HBW HRB
Section shrinkage rate Zc /%
No more than
78 83
S11348 S11203
06Cr13A1 022Cr12
0Cr13A1 00Cr12
175 195
410 360
20 22
60 60
78 --
183
85
S11710
10Cr17
1Cr17
205
450
22
50
--
183
86
S11717
Y10Cr17
Y1Cr17
205
450
22
50
--
183
88
S11790
10Cr17Mo
1Cr17Mo
205
450
22
50
--
183
94
S12791
008Cr27Mo
00Cr27Mo
245
410
20
45
--
183
95
S13091
008Cr30Mo2
00Cr30M02
295
450
20
45
183
183
Table 7 is only applicable to the steel bars that the diameter, side length, thickness or subtense distance is less than or equal to 75mm, for the steel bars of more than 75mm, it can be forged into 75mm sample blank for test, or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. Proof strength, non-proportional extension and hardness shall only be tested when it is required by the Buyer (to be indicated in contract), in this case, the Supplier can select one method to determine hardness according to the dimension and state of steel bars. It is not applicable to flat steel, but w hen it is required by the Buyer, it shall be decided through negotiation of both the Supplier and Buyer. For the round steel, hexagonal steel and octagonal steel that diameter or subtense distance is less than or equal to 16mm, or for the square steel and flat steel that the thickness is less than 12mm, it shall not conduct impact test.
16
GB/T 1220—2007
Table 9 Mechanical properties of Martensite type steel bars or test pieces through heat treatment Code in GB/T 20878
Unified numerical code
New grade
Original grade
a
Mechanical property of test piece through quench tempering (See Table A.4) G r o u p
Proof strength, non-proportional extension RP0.2 b/(N/mm2)
Tensile strength R m /(N/mm2)
Shrinkage rate after fracture A /%
Section shrinkage rate Z b/%
Charpy absorbed energy Aku2d/J
HBW
HEC
No less than
96 97 98 100 101 102 103 104 106 107 108 109 110 111 112 115 116 117 118 a. b. c. d. e.
S40130 S41008 S41010 S41617 S42020 S42030 S42037 S42040 S43110 S43120 S44070 S44080 S44096 S44097 S44090 S45710 S45830 S45990 S46990
12Cr12 06Cr13 12Cr13 Y12Cr13 20Cr13 30Cr13 Y30Cr13 40Cr13 14Cr17Ni2 17Cr16Ni2* 68Cr17 85Cr17 108Cr17 Y108Cr17 95Cr18 13Cr13Mo 32Cr13Mo 102Cr17Mo 90Cr18MoV
1Cr12 0Cr13 1Cr13 Y1Cr13 2Cr13 3Cr13 Y3Cr13 4Cr13 1Cr17Ni2 7Cr17 8Cr17 11Cr17 Y11Cr17 9Cr18 1Cr13Mo 3Cr13Mo 9Cr18Mo 9Cr18MoV
1 2
390 345 345 345 440 540 540 --700 600 ----
590 490 540 540 640 735 735
25 24 22 17 20 12 8
1080 900~1050 800~950 ------
490 ----
690 ----
10 12 14 ----20 ----
55 60 55 45 50 40 35
118 -78 55 63 24 24
170 -159 159 192 217 217
--
60
25 (Agv)
78
192
No more than 200 183
200 200 223 50
45
Hardness of annealed steel bars HBW
54 56 58 55 -50 55 55
235 235 235 285
295 255 255 269 269 255
200 207 269
269 Table 9 is only applicable to the steel bars that the diameter, side length, thickness or subtense distance is less than or equal to 75mm, for the steel bars of more than 75mm, it can be forged into 75mm sample blank for test, or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. It is not applicable to flat steel, but w hen it is required by the Buyer, it shall be decided through negotiation of both the Supplier and Buyer. For annealing by 75 0℃, the hardness is to be decided through negotiation of the Supplier and Buyer. For the round steel, hexagonal steel and octagonal steel that diameter or subtense distance is less than or equal to 16mm, or for the square steel and flat steel that the thickness is less than 12mm, it shall not conduct impact test. The property group of 17Cr16Ni2 steel shall be indicated in contract, otherwise it shall be selected by the Supplier himself.
GB/T 1220—2007
Table 9 Mechanical properties of Martensite type steel bars or test pieces through heat treatment Code in GB/T 20878
Unified numerical code
New grade
Original grade
a
Mechanical property of test piece through quench tempering (See Table A.4) G r o u p
Proof strength, non-proportional extension RP0.2 b/(N/mm2)
Tensile strength R m /(N/mm2)
Shrinkage rate after fracture A /%
Section shrinkage rate Z b/%
Charpy absorbed energy Aku2d/J
HBW
HEC
No less than
96 97 98 100 101 102 103 104 106 107 108 109 110 111 112 115 116 117 118 a. b. c. d. e.
S40130 S41008 S41010 S41617 S42020 S42030 S42037 S42040 S43110 S43120 S44070 S44080 S44096 S44097 S44090 S45710 S45830 S45990 S46990
12Cr12 06Cr13 12Cr13 Y12Cr13 20Cr13 30Cr13 Y30Cr13 40Cr13 14Cr17Ni2 17Cr16Ni2* 68Cr17 85Cr17 108Cr17 Y108Cr17 95Cr18 13Cr13Mo 32Cr13Mo 102Cr17Mo 90Cr18MoV
1Cr12 0Cr13 1Cr13 Y1Cr13 2Cr13 3Cr13 Y3Cr13 4Cr13 1Cr17Ni2 7Cr17 8Cr17 11Cr17 Y11Cr17 9Cr18 1Cr13Mo 3Cr13Mo 9Cr18Mo 9Cr18MoV
1 2
390 345 345 345 440 540 540 --700 600 ----
590 490 540 540 640 735 735
25 24 22 17 20 12 8
1080 900~1050 800~950 ------
490 ----
690 ----
10 12 14 ----20 ----
55 60 55 45 50 40 35
118 -78 55 63 24 24
170 -159 159 192 217 217
Hardness of annealed steel bars HBW
No more than 200 183
--
200 200 223 235 235 235 285
50 45
25 (Agv)
60
78
192
295 255 255
54 56 58 55 -50 55 55
269 269 255
200 207 269
269 Table 9 is only applicable to the steel bars that the diameter, side length, thickness or subtense distance is less than or equal to 75mm, for the steel bars of more than 75mm, it can be forged into 75mm sample blank for test, or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. It is not applicable to flat steel, but w hen it is required by the Buyer, it shall be decided through negotiation of both the Supplier and Buyer. For annealing by 75 0℃, the hardness is to be decided through negotiation of the Supplier and Buyer. For the round steel, hexagonal steel and octagonal steel that diameter or subtense distance is less than or equal to 16mm, or for the square steel and flat steel that the thickness is less than 12mm, it shall not conduct impact test. The property group of 17Cr16Ni2 steel shall be indicated in contract, otherwise it shall be selected by the Supplier himself.
17
GB/T 1220—2007
Table 10 Mechanical properties of precipitation-hardening type (See Table A.5) steel bars or test pieces Code in GB/T 20878
136
137
138
139
a. b. c.
Unified numerical code
New grade
Original grade
Type
S51550
S51740
S51770
S51570
05Cr15Ni5Cu4Nb
05Cr17Ni4Cu4Nb
07Cr17Ni7A1
07Cr15Ni7Mo2A1
0Cr17Ni4Cu4Nb
0Cr17Ni7A1
0Cr15Ni7Mo2A1
Proof strength, non-proportional extension RP0.2 b/(N/mm2)
Heat treatment
Tensile strength Rm /(N/mm2)
Group
Shrinkage rate after fracture A /%
Section shrinkage rate Z b/%
Hardness
c
HBW
HRW
≤38
NO LESS THAN
Solution treatment 480℃ P aging h r a e c 550℃ r i d p aging e i n t a i 580℃ n t i o aging n 620℃ aging Solution treatment 480℃ P aging h r a e c 550℃ r i d p aging e i n t a i 580℃ n t i o aging n 620℃ aging Solution treatment 510℃ P h e r aging
0
--
--
--
--
≤363
1
1180
1310
10
35
≥375
≥40
2
1000
1070
12
45
≥331
≥35
3
865
1000
13
45
≥302
≥31
4
725
930
16
50
≥277
≥28
0
--
--
--
--
≤363
≤38
1
1180
1310
10
40
≥375
≥40
2
1000
1070
12
45
≥331
≥35
3
865
1000
13
45
≥302
≥31
4
725
930
16
50
≥277
≥28
0
≤380
≤1030
20
--
229
--
1
1030
1230
4
10
≥388
--
565℃ aging
2
960
1140
5
25
≥363
--
Solution treatment 510℃ P h e r aging
0
--
--
--
--
≤269
--
1
1210
1320
6
20
≥388
--
565℃ aging
2
1100
1210
7
25
≥375
--
a c r i d e p i n t a i n t i o n
a c r i d e p i n t a i n t i o n
Table 10 is only applicable to the steel bars that the diameter, side length, thickness or subtense distance is less than or equal to 75mm, for the steel bars of more than 75mm, it can be forged into 75mm sample blank for test, or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. It is not applicable to flat steel, but w hen it is required by the Buyer, it shall be decided through negotiation of both the Supplier and Buyer. The Supplier can select one method to determine hardness according to the dimension and state of steel bars
GB/T 1220—2007
Table 10 Mechanical properties of precipitation-hardening type (See Table A.5) steel bars or test pieces Code in GB/T 20878
136
137
138
139
a. b. c.
New grade
Unified numerical code
Original grade
Type
S51550
05Cr15Ni5Cu4Nb
S51740
05Cr17Ni4Cu4Nb
S51770
07Cr17Ni7A1
S51570
0Cr17Ni4Cu4Nb
0Cr17Ni7A1
07Cr15Ni7Mo2A1
0Cr15Ni7Mo2A1
Proof strength, non-proportional extension RP0.2 b/(N/mm2)
Heat treatment
Tensile strength Rm /(N/mm2)
Group
Shrinkage rate after fracture A /%
Section shrinkage rate Z b/%
Hardness
c
HBW
HRW
NO LESS THAN
Solution treatment 480℃ P aging h r a e c 550℃ r i d p aging e i n t a i 580℃ n t i o aging n 620℃ aging Solution treatment 480℃ P aging h e r a c 550℃ r i d aging e p i n t a i 580℃ n t i o aging n 620℃ aging Solution treatment 510℃ P h e r aging
0
--
--
--
--
≤363
≤38
1
1180
1310
10
35
≥375
≥40
2
1000
1070
12
45
≥331
≥35
3
865
1000
13
45
≥302
≥31
4
725
930
16
50
≥277
≥28
0
--
--
--
--
≤363
≤38
1
1180
1310
10
40
≥375
≥40
2
1000
1070
12
45
≥331
≥35
3
865
1000
13
45
≥302
≥31
4
725
930
16
50
≥277
≥28
0
≤380
≤1030
20
--
229
--
1
1030
1230
4
10
≥388
--
565℃ aging
2
960
1140
5
25
≥363
--
Solution treatment 510℃ aging
0
--
--
--
--
≤269
--
1
1210
1320
6
20
≥388
--
565℃ aging
2
1100
1210
7
25
≥375
--
a c r i d e p i n t a i n t i o n
P h r a e r c i d e p i n t a i n t i o n
Table 10 is only applicable to the steel bars that the diameter, side length, thickness or subtense distance is less than or equal to 75mm, for the steel bars of more than 75mm, it can be forged into 75mm sample blank for test, or through negotiation of the Supplier and Buyer to stipulate that it is allowable to reduce the value of its mechanical properties. It is not applicable to flat steel, but w hen it is required by the Buyer, it shall be decided through negotiation of both the Supplier and Buyer. The Supplier can select one method to determine hardness according to the dimension and state of steel bars
18
GB/T 1220—2007
7.5
Corrosion resistance It may conduct intercrystalline corrosion test on austenite type and austenite-ferrite type stainless steel bars, as it is required by the Buyer, with the proper test method decided through negotiations of both the Supplier and Buyer, which should be indicated in contract, the corrosion resistance of which refers to Table 11 and Table 12 hereof. The corrosion resistance for the steel bars other than the grades listed in Table 11 and Table 12 shall be determined through negotiations of both the Supplier and Buyer. Table 11 Determination for 10% oxalic acid corrosion test in GB/T 4334.1
Code in GB/T 20878
Unified numerical code
New grade
Original grade
17
S30408
06Cr19Ni10
0Cr18Ni9
Test state
t r S e a o l t m u t
GB/T 4334.2 sulfuric acid - ferric sulfate corrosion test
Channel texture
GB/T 4334.3 65% nitric acid corrosion test
Channel texture Depression texture II
GB/T 4334.5 sulfuric acid copper sulfate corrosion test
Channel texture
GB/T 1220—2007
7.5
Corrosion resistance It may conduct intercrystalline corrosion test on austenite type and austenite-ferrite type stainless steel bars, as it is required by the Buyer, with the proper test method decided through negotiations of both the Supplier and Buyer, which should be indicated in contract, the corrosion resistance of which refers to Table 11 and Table 12 hereof. The corrosion resistance for the steel bars other than the grades listed in Table 11 and Table 12 shall be determined through negotiations of both the Supplier and Buyer. Table 11 Determination for 10% oxalic acid corrosion test in GB/T 4334.1
Code in GB/T 20878
Unified numerical code
New grade
Original grade
17
S30408
06Cr19Ni10
0Cr18Ni9
38 45 49 18
S31608 S31688 S31708 S30403
06Cr17Ni12Mo2 06Cr18Ni12Mo2Cu2 06Cr19Ni13Mo3* 022Cr19Ni10
0Cr18Ni9 0Cr17Ni12Mo2 0Cr18Ni12Mo2Cu2 00Cr19Ni10
Test state
t r S e a o l t m u t i e o n n t
s t r e n e a s i t m t i e z n i n t g
GB/T 4334.2 sulfuric acid - ferric sulfate corrosion test
Channel texture
Channel texture
GB/T 4334.3 65% nitric acid corrosion test
Channel texture Depression texture II
GB/T 4334.5 sulfuric acid copper sulfate corrosion test
Channel texture
Channel texture Depression texture II
Channel 39 S31603 022Cr17Ni12Mo2 00Cr17Ni14Mo2 texture 46 S31683 022Cr18Ni14Mo2Cu2 00Cr18Ni14Mo2Cu2 50 S31703 022Cr19Ni13Mo3 00Cr19Ni13Mo3 55 S32168 06Cr18Ni11Ti 0Cr18Ni10Ti --62 S34778 06Cr18Ni11Nb 0Cr18Ni11Nb a It may conduct sensitizing treatment, but it shall be determined through negotiations of both the Supplier and Buyer before test.
Table 12 Intercrystalline corrosion test Cod e in GB/ T 2087 8
Unified numeri cal code
17
S3040 8
06Cr19Ni10
S3160 8 S3168 8 S3170 8 S3040 3
06Cr17Ni12Mo2
0Cr17Ni12Mo2
06Cr18Ni12Mo2 Cu2 06Cr19Ni13Mo3*
0Cr18Ni12Mo2 Cu2 0Cr19Ni13Mo3*
022Cr19Ni10
00Cr19Ni10
38 45 49 18
39 46 50 41
S3160 3 S3168 3 S3170 3 S3166 8
GB/T 4334.2
New grade
GB/T 4334.3
GB/T 4334.5
Original grade Tes t stat e
Weight loss by corrosio n [g/(m2.h )]
0Cr18Ni9
022Cr17Ni12Mo2
00Cr17Ni14Mo2
022Cr18Ni14Mo2 Cu2 022Cr19Ni13Mo3
00Cr18Ni14Mo2 Cu2 00Cr19Ni13Mo3
06Cr17Ni12Mo2 Ti
0Cr18NNi12Mo 3Ti
S o l u t i o n t r e a t m e n t
s e n s i t i z i n g t r e a t m e n t
agreeme nt
agreeme nt
Test state
Solution treatme nt
sensitizi ng treatme nt
Weight loss by corrosio n [g/(m2.h )] agreeme nt
Tes t stat e S o l u t i o n t r e a t m e n t
agreeme nt s e n s i t i z i n g t r e a t m e n t
State of curved surface under test
No Intercrystall ine corrosion crack is allowed
GB/T 1220—2007 55
S3216 06Cr18Ni11Ti 0Cr18Ni10Ti 8 62 S3477 06Cr18Ni11Nb 0Cr18Ni11Nb 8 a It may conduct sensitizing treatment, but it shall be determined through negotiations of both the Supplier and Buyer before test.
7.6 7.6.1
Macro structure The acid dip macroscopic test piece of steel bar shall have no visible shrinkage cavity, air bubble, crack, inclusion, skull patch or shatter crack. It is permissible for steel bars for cutting processing to have subsurface inclusion or other inclusion with depth to be no more than half of nominal dimension tolerance.
7.6.2
The qualification level for acid dip macro structure shall conform to the stipulations set forth in Table 13 hereof. When the Buyer requires group 1, it should be indicated in contract. For steel bars with dimension no more than 200mm, the qualification level for macro structure shall be decided through negotiations of the two parties.
7.6.3
If it can be guaranteed by the Supplier, it is permissible to apply ultrasonic detection or other nondestructive flaw detection methods in place of macro structure inspection. Table 13 Macro structure qualification level
7.7 7.7.1
Group
Common porosity
Center porosity
Ingot type segregation
Group 1
≤Level 2
≤Level 2
≤Level 2
Group 2
≤Level 3
≤Level 3
≤Level 3
Hot forging Steel for hot heading upsetting (to be indicated in contract) shall be subject to hot forging test to forge test piece to one third of the original height without crack or breach on the surface.
7.7.2
This test can be omitted for steel bar with dimension to be more than 80mm if the Supplier can guarantee the qualification of forging t est.
7.8 7.8.1
Surface quality The surface of steel bars for pressing processing shall have no crack, scab, fold or inclusion on surface, otherwise, the defects mentioned above must be eliminated. The depth for such elimination shall conform to the stipulation in Table 14 hereof and the width should be no less than 5 times of depth, while the maximum elimination depth on the same cross section shall be no more than one and it is permissible for individual scratches, impressions or pockmarks whose size is no more than half of nominal dimension counting from actual dimension, or the minor cracks with depth to be no more than 0.20mm to exist on surface. Based on the agreement of the Supplier and Buyer, the surface of steel bars for cutting processing can be turned or peeled.
Table 14 Permissible depth for defect elimination on the surface of steel bars for pressing processing purpose Nominal dimension of steel bars/mm
Permissible depth of elimination
≤80
Half of nominal dimension tolerance of steel bars
> 80 ~ 140
Nominal dimension tolerance of steel bars
> 140 ~ 200
5% of nominal dimension of steel bars
GB/T 1220—2007
> 200 ~ 250
6% of nominal dimension of steel bars
It is permissible for steel bars for cutting processing to have local defects no more than
7.8.2
stipulations counting from nominal dimension as set forth in Table 15 hereof. Table 15 Permissible depth for local defects on the surface of steel bars for cutting processing Nominal dimension of steel bars/mm
Permissible depth of local defects
< 100
Negative deviation of nominal dimension of steel bars
≥100
Nominal dimension tolerance of steel bars
It can remove the scale produced by heat treatment by pickling, turning or other methods
7.8.3
through negotiations of both the Supplier and Buyer, which should be indicated in contract. 7.9
Special requirements Steel bars can be supplied by the following special requirements as requested by the Buyer and with agreement reached by both the Supplier and Buyer. a)
Reduce the range of chemical compositions as listed in Table 1 ~ Table 5;
b) Restrict the upper limit of tensile strength as listed in Table 6 ~ Table 10; c)
Add the test on corrosion resistance;
d) Check alpha phase content; e)
Check nonmetallic inclusion content in steel;
f)
Check grain size of steel;
g) Add inspection with tower sample; h) Other special requirements. 8.
Test methods The inspection items and test methods for each lot of steel bars shall conform to the stipulations as set forth in Table 16 hereof. Table 16 Inspection item, sampling quantity, sampling position and test method for steel bars
No. 1
Inspection items Chemical compositions
Samplinga quantity 1
Sampling position
Test method
GB/T 20066
GB/T 223 (see Chapter 2), GB/T 11170, Appendix A of GB/T 9971-2004,
2 3
Tensile Impact
2 2
4
Hardness
2
5
intercrystalline corrosion
2
Macro structure
2
6
On different steel bars, GB/T 2975
GB/T 228 GB/T 229 GB/T 230.1, GB/T 231.1, GB/T 4340.1
On different steel bars
GB/T 4334.1, GB/T 4334.2, GB/T 4334.3, GB/T 4334.5
different steel bars or blank equivalent to ingot head; on any of different steel bars for continuous cast steel On full piece of steel bar
GB/T 226, GB/T 1979
7
Ultrasonic inspection
2
GB/T 7736
8
Hot forging
2
9
Nonmetallic inclusion
2
On different steel bars
GB/T 10561
10 11
Grain size Alpha phase
1 1
Any steel bar
GB/T 6394
YB/T 5293
GB/T 6401 –1986, GB/T 13305—991
GB/T 1220—2007
12
Tower shape
2
different steel bars or blank equivalent to ingot head; on any of different steel bars for continuous cast steel
GB/T 15711, GB/T 10121
Piece by On full piece of steel bar Calipers, micrometer caliper piece Piece by 14 Surface Visual inspection piece In addition to surface and dimension inspections piece by piece, the sampling quantity for all the other inspection items of electroslag remelted steel shall be 1. When lot is organized by the consumable electrode melting mother furnace number, in addition to 1 sample taken from each electroslag furnace number for chemical compositions, the sampling quantity for other inspection items shall be the same as stipulations in this table. 13
9.
Dimension
Inspection rules Inspection and acceptance
9.1
The inspection and acceptance of steel bars shall be conducted by the technical and quality control departments of the Supplier. Lot organization rules
9.2
The inspection and acceptance of steel bars shall be carried out lot by lot. Each lot shall be composed of steel bars of the same grade, same furnace number, same processing method, same dimension and same delivery state (same furnace number of heat treatment). For the electroslag remelted steel, it is permissible to make delivery by the lot organized by the consumable electrode melting mother furnace number under the conditions that the process is stable and all technical requirements in this Standard can be guaranteed, which should be noted in certificate of quality. quality. Sampling position and sampling quantity
9.3
The sampling position and sampling quantity for each lot of steel bars shall conform to the stipulations set forth in Table Table 16 hereof. Rules for reinspection and determination
9.4 9.4.1
Rules for reinspection and determination shall execute the stipulations of GB/T 17505.
9.4.2
If the Supplier can guarantee the qualification of steel bars, it is permissible to use blank in place of product or use the large one in place of small one in the inspection results in connection with the mechanical property, macro structure and nonmetallic inclusion of steel bars or steel blanks from the same furnace number. number.
10. Packing, marking and quality certificate
The packing, marking and quality certificate shall conform to the stipulations of GB/T 2101.
GB/T 1220—2007
Appendix A (Informative appendix)
Typical heat treatment regulations for stainless steel bars or test pieces Table A.1 Typical heat treatment regulations for austenite type stainless steel bars or test pieces Code in GB/T 20878
Unified numerical code
New grade
Original grade grade
Solution treatment /℃ 1 010 ~ 1 120, fast-cooling 1 010 ~ 1 120, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 030 ~ 1 150, fast-cooling 1 030 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 000 ~ 1 100, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling 1 010 ~ 1 180, fast-cooling 1 030 ~ 1 150, fast-cooling 920 ~ 1 150, fast-cooling 980 ~ 1 150, fast-cooling 1 010 ~ 1 150, fast-cooling
a
When it is indicated in contract by the Buyer, it may conduct heat treatment, in this case, the heat treatment temperature shall be 85 0℃ ~ 930℃.
GB/T 1220—2007
Table A.2 Typical heat treatment regulations for austenite-ferrite type stainless steel bars or test pieces Code in GB/T 20878
Unified numerical code
New grade
Original grade grade
Solution treatment/℃
67
S21860
14Cr18Ni11Si4A1Ti
1Cr18Ni11Si4A1Ti
930 ~ 1 050, fa st-cooling
68
S21953
022Cr19Ni5Mo3Si2N 022Cr19Ni5Mo3Si 2N
00Cr18Ni5Mo3Si2 00Cr18Ni5Mo3Si 2
920 ~ 1 150, fa st-cooling
70
S22253
022Cr22Ni5Mo3N
950 ~ 1 200, fa st-cooling
71
S22053
022Cr23Ni6Mo3N
950 ~ 1 200, fa st-cooling
73
S22553
022Cr25Ni6Mo2N
950 ~ 1 200, fa st-cooling
75
S25554
03Cr25Ni6Mo3Cu2N
1 000 ~ 1 200, fast-cooling
Table A.3 Typical heat treatment regulations for ferrite type stainless steel bars or test pieces Code in GB/T 20878
Unified numerical code
New grade
Original grade grade
Solution treatment /
℃
88
780 ~ 830, air cooling or slow-cooling 700 ~ 820, air cooling or slow-cooling 780 ~ 850, air cooling or slow-cooling 680 ~ 820, air cooling or slow-cooling 780 ~ 850, air cooling or slow-cooling
94
900 ~ 1 050,
78 83 85 86
fast-cooling
95
900 ~ 1 050, fast-cooling
GB/T 1220—2007
Table A.4 Typical heat treatment regulations for martensite type stainless steel bars or test pieces Code in GB/T 20878 96
Unified numerical code
New grade
Original grade
97 98 100 101 102 103 104 106
Heat treatment regulations for steel bars Annealing /℃
Heat treatment regulations for test pieces Quenching Tempering
800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling
950~1 000 oil cooling 950~1 000 oil cooling 950~1 000 oil cooling 950~1 000 oil cooling 920~980 oil cooling 920~980 oil cooling 920~980 oil cooling 1 050~1 100 oil cooling 950~1 050 oil cooling 950~1 050 oil cooling or air cooling
07
680~700 high-temperature tempering, air cooling 1 680~800furnace cooling or air cooling 2
108
800~920 slow-cooling
109
800~920 slow-cooling
110
800~920 slow-cooling
111
800~920 slow-cooling
112
800~920 slow-cooling
1 010~1 070 oil cooling 1 010~1 070 oil cooling 1 010~1 070 oil cooling 1 010~1 070 oil cooling 1 000~1 050 oil cooling
700~750 fast-cooling 700~750 fast-cooling 700~750 fast-cooling 700~750 fast-cooling 600~750 fast-cooling 600~750 fast-cooling 600~750 fast-cooling 200~300 air cooling 275~350 air cooling 600~650 air cooling 750~800 a+ 650~700 , air cooling 100~180 fast-cooling 100~180 fast-cooling 100~180 fast-cooling 100~180 fast-cooling 200~300 oil, air cooling
Table A.4 (continued) Code in GB/T 20878 115
Unified numerical code
New grade
Original grade
Heat treatment regulations for steel bars Annealing /℃
S45710
13Cr13Mo
1Cr13Mo
830~900 slow-cooling or about 750 fast-cooling 800~900 slow-cooling or about 750 fast-cooling
Heat treatment regulations for test pieces Quenching Tempering 970~1 020 oil cooling 1 025~1 075 oil cooling
650~750 fast-cooling 116 S45830 32Cr13Mo 3Cr13Mo 200~300 oil, water or air cooling 117 S45990 102Cr17Mo 9Cr18Mo 800~900 slow-cooling 1 000~1 050 200~300 oil cooling air cooling 118 S46990 90Cr18MoV 91Cr18MoV 800~920 slow-cooling 1 050~1 075 100~200 air oil cooling cooling a When nickel content is of the lower limit as specified in Table 4, it is permissible to carry out single tempering regulations by 620 ~ 720 ℃.
GB/T 1220—2007
Table A.5Typical heat treatment regulations for precipitation-hardening type stainless steel bars or test pieces Code in GB/T 20878
Unified numerical code
New grade
Original grade
Heat treatment Type
group
Conditions
Solution
0
1 020~1 060 ℃ , fast-cooling after solution treatment
1
470~490 ℃ air-cooling after solution treatment
2
540~560 ℃ air-cooling after solution treatment
3
570~590 ℃ air-cooling after solution treatment
4
1 020~1 fast-cooling
0
1 020~1 060 ℃ , fast-cooling after solution treatment
1
470~490 ℃ air-cooling after solution treatment
2
540~560 ℃ air-cooling after solution treatment
3
570~590 ℃ air-cooling after solution treatment
4
610~630 ℃ air-cooling after solution treatment
0
1 000~1 100 fast-cooling
treatment 136
S51550
480℃
05Cr15Ni5Cu4Nb P r e c i p i t a t i o n h a r d e n i n g
ageing 550℃ ageing 580℃ ageing 620℃
060
℃
ageing Solution treatment 137
S51740
05Cr17Ni4Cu4Nb
480℃
0Cr17Ni4Cu4Nb P r e c i p i t a t i o n h a r d e n i n g
ageing 550℃ ageing 580℃ ageing 620℃ ageing Solution
℃ ,
treatment 138
S51770
07Cr17Ni7A1
510℃
0Cr17Ni7A1 P r e c i p i t a t i o n h a r d e n i n g
1
ageing
565℃
2
ageing
Solution
0
955 ℃ ±10 ℃ be kept for 10 minutes after solution treatment, air cooled to room temperature, then cooled to -73 ℃ ±6 ℃ within 24 hours to be held for 8 hours before heating up to 510 ℃±10 ℃ to hold for 1 hours and air cooled 760 ℃ ±15 ℃ be kept for 90 minutes after solution treatment, cooled to 15℃ or less within 1 hours to hold for 30 minutes before heating up to 565 ℃±10 ℃ to hold for 90 minutes and air cooled 1 000~1 100 ℃ fast-cooling
treatment 139
S51570
07Cr15Ni7Mo2A1
0Cr15Ni7Mo2A1
P r e c i p i t a t i o n h a r d e n i n g
510℃
1
ageing
565℃ ageing
2
955 ℃ ±10 ℃ be kept for 10 minutes after solution treatment, air cooled to room temperature, then cooled to -73 ℃ ±6 ℃ within 24 hours to be held for 8 hours before heating up to 510 ℃±10 ℃ to hold for 1 hours and air cooled 760 ℃ ±15 ℃ be kept for 90 minutes after solution treatment,
℃
GB/T 1220—2007 within 1 hours to hold for 30 minutes before heating up to 565 ℃±10 ℃ to hold for 90 minutes and air cooled
Appendix B (Informative appendix) Code in GB/T 20878
Unified numerical code
Table B.1 Stainless steel properties and applications New grade Original grade Properties and applications
1
S35350
12Cr17Mn6Ni5N
3
S35450
12Cr18Mn9Ni5N
9
S30110
12Cr17Ni7
13
S30210
12Cr18Ni9
15
S30317
Y12Cr18Ni9
16
S30327
Y12Cr18Ni9Se
Austenite type 1Cr17Mn6Ni5N Ni-free type steel, its property is similar to 12Cr17Ni7 (1Cr17 Ni7), which can be used in place of 12Cr17Ni7 (1Cr17Ni7). It is nonmagnetic in solution state and slightly magnetic after cold processing. It is mainly used for manufacturing hotel facilities, kitchenware, water pool and traffic means, etc 1Cr18Mn8Ni5N Ni-free type steel is the most typical and better developed Cr-Mn-Ni-N type steel. It possesses very good anti-oxidation property below 800 ℃ while keeping higher strength, which can be used in place of 12Cr18Ni9(1Cr18Ni9). It is mainly used for manufacturing the parts subject to weak media corrosion and load below 800 ℃, such as cooking utensils and tableware, etc 1Cr17Ni7 Metastable austenite steel is the steel subject to easiest cold deformation strengthening. It can obtain high strength and hardness through cold processing while keeping sufficient plastic strength, it possesses better corrosion resistance under atmospheric conditions. It is mainly used to manufacture the equipment and units that are to withstand higher load under cold processing state while expecting lighter weight and corrosion resistance, such as railway cars, decoration plates, conveyer belt and fasteners, etc 1Cr18Ni9 The austenite stainless steel with the longest history possesses excellent plasticity, toughness and cold processing property in solid solution state and better corrosion resistance in oxidable acid, atmosphere, water, steam or other media. Cold processing shall offer high strength, but its elongation is a slightly poorer than 12Cr17Ni7(1Cr17Ni7). It is mainly used to manufacture the structural parts and welded parts with lower requirements on corrosion resistance and strength, such as external decoration materials of buildings; it can be used for nonmagnetic parts and parts for low temperature device. But it intends to have intergranular corrosion in sensitizing state or after welding, so, it is not proper to be used as welded structural material. Y1Cr18Ni9 12Cr18Ni9(1Cr18Ni9) improved cutting property steel. It is the best material to make roller, shaft, bolt and nut, etc, by fast cutting (by automatic lathe, etc) Y1Cr18Ni9Se In addition to adjustment made to phosphonium and sulphur contents in 12Cr18Ni9(1Cr18Ni9) steel, selenium has also been added to improve the cutting property of 12Cr18Ni9(1Cr18Ni9) steel. It is applicable to less cutting volume, and also suitable for hot processing or cold processing, such as screw
GB/T 1220—2007
17
Code in GB/T 20878
S30408
Unified numerical code
06Cr19Ni10
New grade
0Cr18Ni9
Table B.1 (continued) Original grade Properties and applications
18
S30403
022Cr19Ni10
00Cr19Ni10
22
S30488
06Cr18Ni9Cu3
0Cr18Ni9Cu3
S30458
06Cr19Ni10N
0Cr19Ni9N
S30478
06Cr19Ni9NbN
0Cr19Ni10NbN
S30453
022Cr19Ni9Ni10N
00Cr18Ni10N
S30510
10Cr18Ni12
1Cr18Ni12
23
24
25
26
A steel developed on the basis of 12Cr18Ni9(1Cr18Ni9) steel, its property is similar to 12Cr18Ni9(1Cr18Ni9) steel, but its corrosion resistance is better than 12Cr18Ni9(1Cr18Ni9) steel, it can be used to make welded part of small section dimension, so it is a kind of stainless steel of largest quantity and most extensive range in application. It is suitable for manufacturing deep-punching formed parts, as well as acid delivery pipe, vessel and structural parts, etc, it can also be used to make nonmagnetic/low-temperature equipment and parts
This is a super low carbon austenite stainless steel developed to solve the problem that Cr 23C6 seepage make 06Cr19Ni10(0Cr18Ni9) steel have severe intergranular corrosion tendency under certain conditions, its intergranular corrosion resistance in sensitizing state is remarkably better than 06Cr19Ni10(0Cr18Ni9) steel. Except for strength which is a slightly lower, all the other properties are the same as 06Cr19Ni10(0Cr18Ni9) steel, mainly used to make corrosion resistant equipment and parts by way of welding while it is impossible to carry out solution treatment after welding It is a stainless steel developed on the basis of 06Cr19Ni10(0Cr18Ni9) steel to improve its cold forming property. Addition of copper reduces the hardening tendency in cold processing and the reduction of hardening rate in cold processing offers maximum cold deformation under less forming pressure. It is mainly used to manufacture cold upsetting fastener and parts for cold forming like deep drawing, etc Nitrogen is added to 06Cr19Ni10(0Cr18Ni9) steel, not only to prevent reduction of plasticity, but also to improve steel strength and hardening tendency in processing, improve the pitting corrosion resistance and intergranular corrosion resistance of steel and reduce material thickness. It can be used to make equipment or structural parts requiring certain corrosion resistance, higher strength and lighter weight. Nitrogen and niobium are added to 06Cr19Ni10(0Cr18Ni9) steel to improve the pitting corrosion resistance and intergranular corrosion resistance of steel, the properties and applications of which are the same as 06Cr19Ni10N(0Cr19Ni9N) steel It is extra-low carbon steel of 06Cr19Ni10N(0Cr19Ni9N). As the intergranular corrosion resistance of 06Cr19Ni10N (0Cr19Ni9N) steel is remarkably lowered when it is heated under 45 0℃ ~ 900℃ temperature, so 022Cr19Ni10N(00Cr18Ni10N) steel is recommended to welded equipment and parts. It is a stainless steel developed on the basis of 12Cr18Ni9(1Cr18Ni9) steel through increasing nickel content in steel. Its processing hardening property is lower than 12Cr18Ni9(1Cr18Ni9) steel. It is suitable for spinning and special purpose drawing, such used cold upsetting
GB/T 1220—2007
S30908
06Cr23Ni13
0Cr23Ni13
35
S31008
06Cr25Ni20
0Cr25Ni20
38
S31608
06Cr17Ni12Mo2
0Cr17Ni12Mo2
39
S31603
022Cr17Ni12M02
00Cr17Ni14Mo2
32
steel, etc High-chrome-nickel austenite stainless steel, its corrosion resistance is better than 06Cr19Ni10(0Cr19Ni9) steel, but it mostly used as heat-resisting steel in actual application High-chrome-nickel austenite stainless steel with excellent corrosion resistance in oxidable media and very good high-temperature mechanical property, as well, its anti-oxidation property is better than 06Cr23Ni3(0Cr23Ni3) steel, its pitting resistance and stress corrosion resistance are better than 18-8 type stainless steel, it can be used in both corrosion resistant parts and as heat-resisting steel Molybdenum is added to 10Cr18Ni12(1Cr18Ni12) steel so that the steel has excellent properties of reductive media resistance and pitting resistance. In sea water and other media, its corrosion resistance is better than 06Cr19Ni10(0Cr18Ni9) steel. It is mainly used as pitting resistant material The extra-low carbon steel of 06Cr17Ni12Mo2 (0Cr17Ni12Mo2), with excellent sensitizing state intergranular corrosion resistance. It is suitable for manufacturing the welded parts and equipment of thick section dimension, such as corrosion resistant material for equipment in petrochemical, fertilizer, paper making, printing and dyeing and atomic energy industries
Table B.1 (continued) Code in GB/T 20878 41
Unified numerical code
New grade
Original grade
Properties and applications
S31668
06Cr17Ni12Mo2Ti
0Cr18Ni12Mo3Ti
43
S31658
06Cr17Ni12Mo2N
0Cr17Ni12Mo2N
44
S31653
022Cr17Ni12Mo2N
00Cr17Ni13Mo2N
45
S31688
06Cr18Ni12Mo2Cu2
0Cr18Ni12Mo2Cu2
This is a steel species developed to solve the problem that 06Cr17Ni112Mo2(0Cr17Ni12Mo2) steel have intergranular corrosion tendency, it possesses excellent intergranular corrosion resistance and other properties are similar to 06Cr17Ni112Mo2(0Cr17Ni12Mo2) steel. It is suitable for manufacturing welded parts. Nitrogen is added to 06Cr17Ni12Mo2(0Cr17Ni12Mo2) steel, to improve steel strength without reduction of plasticity and reduce material thickness. It can be used to make parts requiring good corrosion resistance and high strength Nitrogen is added to 022Cr17Ni12Mo2(00Cr17Ni14Mo2) steel so that it possesses the same properties as 022Cr17Ni12Mo2(00Cr17Ni14Mo2) steel and the applications are the same as 06Cr17Ni12Mo2N(0Cr17Ni12Mo2N) steel, but the intergranular corrosion resistance is much better. It is mainly used in such fields as fertilizer, paper making, medicine making and high pressure equipment, etc 2% of Cu is added to 06Cr17Ni12Mo2(0Cr17NiMo2) steel to improve its corrosion resistance and pitting corrosion resistance. It is mainly used as sulfuric acid resistant material, which can also be used to make welded structural parts, pipes and vessels, etc It is the extra-low carbon steel of
GB/T 1220—2007
49
S31708
06Cr19Ni13Mo3
0Cr19Ni13Mo3
50
S31703
022Cr19Ni13Mo3
00Cr19Ni13Mo3
52
S31794
03Cr18Ni16Mo5
0Cr18Ni16Mo5
55
S32168
06Cr18Ni11Ti
0Cr18Ni10Ti
62
S34778
06Cr18Ni11Nb
0Cr18Ni11Nb
06Cr18Ni12Mo2Cu2 (0Cr18Ni12MoCu2) steel. Its intergranular corrosion resistance is better than 06Cr18Ni12Mo2Cu2 (0Cr18Ni12MoCu2) steel. The applications are the same as 06Cr18Ni12Mo2Cu2 (0Cr18Ni12MoCu2) steel The pitting corrosion resistance and creep resistance is better than 06Cr17Ni12Mo2 (0Cr17Ni12Mo) steel. It is used to make paper making equipment, printing and dyeing equipment, petrochemical equipment and organic acid corrosion resistant equipment, etc It is the extra-low carbon steel of 06Cr19Ni13Mo3 (0Cr19Ni13Mo3) steel. Its intergranular corrosion resistance is better than 06Cr19Ni13Mo3 (0Cr19Ni13Mo3) steel. The applications are the same as 06Cr19Ni13Mo3 (0Cr19Ni13Mo3) steel High-molybdenum stainless steel with pitting corrosion resistance better than 022Cr17Ni12Mo2(00Cr17Ni14Mo2) steel and 06Cr17Ni12Mo2Ti (0Cr18Ni12Mo3Ti) steel, and the corrosion resistance in sulfuric acid, formic acid, acetic acid and other media is much better than the common Cr-Ni steel containing 2 % ~ 4% of Mo. It is mainly used in the heat exchanger dealing with chlorine solion, acetic acid equipment, phosphoric acid equipment, bleaching facilities, etc, as well as used in the environment no applicable to less steel with pitting corrosion resistance better than 022Cr17Ni12Mo2 (00Cr17Ni14Mo2) steel and 06Cr17Ni12Mo2Ti (0Cr18Ni12Mo3Ti) steel Titanium is added to titanium stabilized austenite stainless steel to improve intergranular corrosion resistance, which has excellent high-temperature mechanical property. It can be substituted by extra-low carbon austenite stainless steel. It shall not be recommended other than special purposes (high temperature or hydrogen corrosion resistance) Niobium is added to niobium stabilized austenite stainless steel to improve intergranular corrosion resistance, the corrosion resistance in acid, alkali, salt and other media is the same as 06Cr18Ni11Ti (0Cr18Ni10Ti) steel, with good welding performance. It can be used both as corrosion resistance material and heat-resisting steel mainly in thermal power stations and petrochemical fields, etc, to make vessel, pipe, heat exchanger and shafts, etc; it can also be used as welding material
Table B.1 (continued) Code in GB/T 20878 64
Unified numerical code
New grade
Original grade
Properties and applications
S38148
06Cr18Ni13Si4
0Cr18Ni13Si4
Nickel and silicon are added to 06Cr19Ni10 (0Cr18Ni9) steel to improve its stress
GB/T 1220—2007
can be used in the environment containing chloride ion, such as vehicle exhaust purifying device, etc 67
S31860
14Cr18Ni11Si4A1Ti
68
S21953
022Cr19Ni5Mo3Si2N
70
S22253
022Cr22Ni5Mo3N
71
S22053
022Cr22Ni5Mo3N
73
S22553
022Cr25Ni6Mo2N
75
S25554
03Cr25Ni6Mo3Cu2N
78
S11348
06Cr13A1
Austenite-ferrite type 1Cr18Ni11Si4A1Ti Silicon so contained has improved the strength and aqua fortis corrosion resistance of the steel, it can be used to make parts and equipment requiring resistance to high temperature and aqua fortis media, such as aqua fortis discharge valve, etc 00Cr18Ni5Mo3Si2 It is a special purpose stainless steel with chloride stress corrosion resistance formed by adding 0.05% N ~ 0.10% N into Sweden 3RE60 steel. Its corrosion resistance is equivalent to 022Cr17Ni12Mo2 (00Cr17Ni14Mo2) steel. It is applicable to the environment containing chloride ion to make heat exchanger and condenser, etc, for oil refining, fertilizer, paper making, petrochemical and chemical industries, it can also be used in place of 022Cr19Ni10 (00Cr19Ni10) steel and 022Cr17Ni12Mo2 (00Cr17Ni14Mo2) steel for applications in environment subject to stress corrosion damage Developed on the basis of Sweden SAF2205 steel, it is a dual phase stainless steel of most extensive applications in the world. With resistance to the environment containing hydrogen sulfide, carbon dioxide and chloride, it can be used for cold/hot processing and forming, used as structural material in place of 022Cr19Ni10 (00Cr19Ni10) and 022Cr17Ni12Mo2 (00Cr17Ni14Mo2) austenite stainless steel. It is used to make oil well pipe, chemical storage tank, heat exchanger and condensation cooler, etc, the pressure equipment subject to pitting corrosion and stress corrosion Derived from 022Cr22Ni5Mo3N, its application range is narrower. The properties and applications are the same as 022Cr22Ni5Mo3N steel It comes from 0Cr22Ni5Mo3N steel by increasing molybdenum content, decreasing carbon content and adding nitrogen, featuring high strength, chloride stress corrosion resistance and good welding performance, it is a steel of best pitting corrosion resistance. It can be used in place of 0Cr26Ni5Mo2 steel. It is mainly applied in the industrial fields like chemical, fertilizer and petrochemical industries to make heat exchanger and evaporator, etc Developed on the basis of British Ferralium alloy 255, it possesses excellent mechanical property and local corrosion resistance, especially, its wear resistance is better than common austenite stainless steel, so, it is an ideal material for sea water environment. It can be used to make screw propeller and shaft for ship, or sealers for submarine, etc, it is also applicable to chemical, petrochemical, natural gas, paper pulp and paper making industries, etc Ferrite type Low-chrome pure ferrite stainless steel is a 0Cr13A1 non-quench hardened steel. Its stainlessness and anti-oxidation is equivalent to low-chrome steel, while its plasticity, toughness and cold forming property is better than other ferrite stainless steels containing higher chrome. It is mainly applied in the places not suitable for
GB/T 1220—2007 because of air quench hardening, such as oil making installation, lining of pressure vessel, blade of steam turbine and clad steel plate, etc
Table B.1 (continued) Properties and applications
Code in GB/T 20878 83
Unified numerical code
New grade
Original grade
S11203
022Cr12
00Cr12
85
S11710
10Cr17
86
S11717
Y10Cr17
88
S11790
10Cr17Mo
94
S12791
008Cr27Mo
95
S13091
008Cr30Mo2
96
S40310
12Cr12
97
S41008
06Cr13
98
S41010
12Cr13
It contains less carbon than 022Cr13 (0Cr13), with better bending property at welded position, processing property and high temperature oxidation resistance. It can applied in vehicle exhaust treatment device, boiler combustion chamber, nozzle, etc It features high corrosion resistance, mechanical property 1Cr17 and thermal conductivity with stainlessness in atmosphere, water vapor or other media, but its stainlessness is not sufficient in the media containing higher chloride ion. It is mainly used in the chemical facilities producing nitric acid and grisoutite, such as absorption tower, heat exchanger, storage tank, etc; sheet plate is mainly applied in internal decorations of building, office equipment, kitchen utensil, car decoration and gas burner, etc. As its brittleness changing temperature is higher than room temperature and it is sensitive to notching, it is not suitable to be used to make the equipment and parts to withstand load below room temperature, and the section dimension for the steel material commonly used shall not exceed 4mm It is a steel for cutting purpose improved from Y1Cr17 10Cr17(1Cr17) mainly used to make the parts to be processed with large cutting volume by automatic lathe, such as bolt and nut, etc Molybdenum is added to 10Cr17(1Cr17) steel to improve 1Cr17Mo the pitting corrosion resistance, crevice corrosion resistance and strength of the steel, its salt solution resistance is better than 10Cr17(1Cr17) steel. It is mainly used as material for vehicle hub, fastener and external decoration of vehicle It is the earliest steel among high pure ferrite stainless steel, 00Cr27Mo its properties are similar to 008Cr30Mo2(00Cr30Mo2) steel. It is suitable for the applications requiring both corrosion resistance and soft-magnetic 00Cr30Mo2 It is a high pure ferrite stainless steel with low brittleness changing temperature and good property of halogen ion stress corrosion damage resistance, its corrosion resistance is equivalent to pure nickel, possessing excellent toughness, processing/forming properties and welding performance. It is mainly applied in complete set of equipment for chemical industry (acetic acid, lactic acid or other organic acids and superalkali concentration engineering), food industry, oil refining industry, electric power industry, water treatment industry and pollution control, etc, to make heat exchanger, pressure vessel, tank and other equipment Martensite type It is an excellent heat-resisting stainless steel for steam 1Cr12 turbine blades and high-stress parts Applicable to parts requiring higher toughness and subject to 0Cr13 impact load, such as steam turbine blades, structural frame, lining, bolt and screw cap ,etc It is a semi-martensite type stainless steel with higher 1Cr13 strength and toughness through quench tempering treatment, it possesses excellent corrosion resistance and machining property. It is mainly applied to the parts requiring higher toughness, stainlessness and subject to impact load, such as
GB/T 1220—2007
100
S41617
Y12Cr13
Y1Cr13
cutting tool, blade, fastener, valve for water press and pyrolysis ant-sulphur corrosion equipment, etc; it can also be used to make the equipment and parts requiring weak corrosive media resistance under normal temperature condition It is a steel with best cutting property among stainless steel, used for automatic lathe
Table B.1 (continued) Original Properties and applications grade
Code in GB/T 20878 101
Unified numerical code
New grade
S42020
20Cr13
2Cr13
102
S42030
30Cr13
3Cr13
103
S42037
Y30Cr13
Y3Cr13
104
S42040
40Cr13
4Cr13
106
S43110
14Cr17Ni2
4Cr17Ni2
107
S43120
17Cr16Ni2
108
S44070
68Cr17
7Cr17
109
S44080
85Cr17
8Cr17
Martensite type stainless steel, main properties are similar to 12Cr13(1Cr13). As the carbon content is higher, its strength and hardness is higher than 12Cr13(1Cr13) while its toughness and corrosion resistance is lower. Mainly used to make parts subject to high stress load, such as steam turbine blade, hot oil pump and its shaft, shaft sleeve and blade, valve element for water press, etc, it can also be applied in paper making industry, medical device industry and everyday consumables field to make cutting tool and tableware ,etc It is Martensite type stainless steel, its strength, hardness and hardenability is better than 12Cr13(1Cr13) and 20Cr13(2Cr13) steels, with certain corrosion resistance in diluted nitric acid and weak organic cid under room temperature, but it is no better than 12Cr13(1Cr13) and 20Cr13(2Cr13) steels. It is mainly used for strength parts, as well as wearing parts subject to high stress load under certain corrosive media conditions, such as cutting tools and spring to operate under 300 degree or less, and the shaft, bolt, valve and bearing to operate under 400 degree temperature, etc It is a steel to improve the cutting property of 30Cr13(3Cr13) steel. The applications are similar to 30Cr13(3Cr13) steel, requiring better cutting property The property and applications are similar to 30Cr13(3Cr13) steel, but its toughness and corrosion resistance is slightly lower. Mainly used to make surgical apparatus, bearing, valve and spring, etc. 40Cr13 (4Cr13) steel possesses poor welding performance, not good for manufacturing welded parts It shall obtain higher mechanical property from heat treatment, its corrosion resistance is better than 12Cr13(1Cr13) and 10Cr17(1Cr17) steels. It is usually used to make shafts, piston rod, pump, valve, as well as spring and fastener, etc, requiring both high hardenability of mechanical property and resistance to nitric acid and organic acid corrosion Its processing property is obviously better than 14Cr17Ni2 (1Cr17Ni2) steel, suitable for making corrosion resistant parts requiring higher strength, toughness and plasticity and load bearing parts working in damp media High-chrome Martensite type stainless steel, its hardenability is higher than 20Cr13(2Cr13) steel. In quench hardened state, it possesses high strength and hardness while having stainlessness and corrosion resistance. It is usually used to make cutting tool, measuring tool, shafts, levers, valve, hooks and other corrosion resistant parts requiring stainlessness and resistance to the corrosion of diluted oxidable acid, organic acid and salts It is a hardenable stainless steel. Its property and applications are similar to 68Cr17 (7Cr17) steel, but when it is hardened, the hardness is larger than 68Cr17(7Cr17) steel while toughness is better than 108Cr17(11Cr17) steel. It is used to make cutting tool and valve seat, etc
GB/T 1220—2007
Y108Cr17
Y11Cr17
and stainless steels. Its property and applications are similar to 68Cr17 (7Cr17) steel. It is used to make jet nozzle and bearing, etc It is a steel species improve from 108Cr17 (11Cr17) steel. It is designed for automatic lathe
111
S44097
Code in GB/T 20878
Unified numerical code
New grade
S44090
95Cr18
9Cr18
115
S45710
13Cr13Mo
1Cr13Mo
116
SS45830
32Cr13Mo
3Cr13Mo
117 118
S45990 S46990
102Cr17Mo 90Cr18MoV
9Cr18Mo 9Cr18MoV
Table B.1 (continued) Original grade Properties and applications
112
High-carbon Martensite type stainless steel. Corrosion resistance is better than Cr17 type Martensite type stainless steel, while other properties are similar to Cr17 type Martensite type stainless steel. It is mainly used to make corrosion resistant and wearing resistant high-strength parts, such as shaft, pump, valve element, levers, spring and fastener, etc. Uneven carbohydrate is easy to form in this steel to affect steel quality and property, which should be noted in production. It is high strength steel with better corrosion resistance than 12Cr13(1Cr13) steel. It is used to make steam turbine blades and high temperature parts, etc Molybdenum is added to 30Cr13(3Cr13) steel to improve steel strength and hardness, which has also strengthened secondary hardening effect, and it corrosion resistance is better than 30Cr13(3Cr13) steel. Its main applications are similar to 30Cr13(3Cr13) steel The property and applications are similar to 95Cr18(9Cr18) steel. Because molybdenum and vanadium are added to this steel, its high temperature strength and anti-tempering capacity are better than 95Cr18(9Cr18) steel. The main applications are the same as 30Cr13(3Cr13) steel. It is mainly used to make the parts to withstand friction and work in corrosive media, such as measuring tool and cutting tool, etc
Precipitation-hardening type 136
S51550
05Cr15Ni5Cu4Nb
137
S51740
05Cr17Ni4Cu4Nb
0Cr17Ni4Cu4Nb
It is martensite precipitation-hardening type stainless steel developed from 05Cr17Ni4Cu4Nb (1Cr17Ni2) steel, in addition to high strength, it possesses also high transverse toughness and sound forgeability, its corrosion resistance is equivalent to 05Cr17Ni4Cu4Nb (1Cr17Ni2) steel, it is mainly applied to the service environment requiring not only high strength and good toughness, but also excellent corrosion resistance, such as high strength forged parts, valve elements of high pressure system and parts of air plane It is martensite precipitation-hardening type stainless steel added with copper and niobium, its strength can be adjusted through changing heat treatment technique, the corrosion resistance is better than Cr13 type, 95Cr18(9Cr18) and 14Cr17Ni2 (1Cr17Ni2) steels, the resistance to corrosion, fatigue and water drop erosion is better than 12% martensite type stainless steel, welding
GB/T 1220—2007
138
S51770
07Cr17Ni7A1
0Cr17Ni7A1
139
S51570
07Cr15Ni7Mo2A1
0Cr15Ni7Mo2A1
procedure is simple and easy to be processed, but it is hard to conduct deep cold forming. It is mainly used to make high strength parts requiring both of stainlessness and resistance to corrosion of weak acid, alkalis and salt. Such as the final level moving blade of steam turbine and the structural parts working in corrosive environment with operating temperature to be less than 30 0℃ It is semi-martensite precipitation-hardening type stainless steel added with aluminium, the compositions is nearly the same as 18-8 type austenite stainless steel with excellent melting and processing properties. It can be used to make the structural parts, vessel, pipe, spring, washer and measuring device parts to work below 35 0℃ for a prolonged period of time. The technique for heat treatment of this steel is complicated, so there is tendency to be substituted by martensite ageing worldwide, but there are still extensive application fields It is a semi-martensite precipitation-hardening type stainless steel using 2% Mo to substitute 2% Cr in 07Cr17NiAl (0Cr17NiAl) steel to improve its resistance to the corrosion of reductive media and its comprehensive performance is better than 07Cr17NiAl (0Cr17NiAl) steel. It is used to make the high strength vessel, parts and structural parts with certain corrosion resistant requirements in astronautical navigation, petrochemical and energy fields ,etc
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