Transcript
IS 4367 : 1991 (Reaffir (Reaffirmed med 2001) Editi Edition on 2.1 2.1 (1994-11)
Indian Standard
ALLOY STEEL FORGINGS FOR GENERAL INDUSTRIAL USE — SPECIFICATION ( Fir First Revi Revisi sion on ) (Incorporating Amendment No. 1)
UDC 669.15 — 194 — 134
© BIS 2002
BUREAU
OF
INDIAN
STANDARDS
MANAK BHAVAN MANAK BHAVAN , 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002
Price Group 4
Steel Forgings Sectional Committee, MTD 18
FOREWORD This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Steel Forgings Sectional Committee had been approved by the Metallurgical Engineering Division Council. This standard was first published in 1967. On the basis of experience gained in the production and use of steel forgings, the following major modifications have been incorporated in this version: a) In Table 1, one new grade 12NiCrMo 2 has been included. b) A new clause indicating type of condition of delivery has been included. c) Requirements for macrostructure, inclusion rating and grain size have been incorporated. d) Tool steel part has been deleted from this standard and the requirements have been covered in IS 13387 : 1992 Tool steel forgings for metal forming — Specification. For the benefit of the purchaser an informative annexure ( see Annex A ) giving particulars to be specified by the purchaser has been included. This edition 2.1 incorporates Amendment No. 1 (November 1994). Side bar indicates modification of the text as the result of incorporation of the amendment. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )’. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
IS 4367 : 1991
Indian Standard
ALLOY STEEL FORGINGS FOR GENERAL INDUSTRIAL USE — SPECIFICATION ( First Revision ) 1 SCOPE
IS No. 1598 : 1977
Method for izod impact test of metals ( first revision ) 1608 : 1972 Method for tensile testing of steel products ( first revision ) 1762 (Part 1) : Code for designation of steels, 1974 based on letter symbols ( first revision ) 3469 (Parts 1 Tolerances for closed die steel to 3) : 1974 forgings ( first revision ) 4163 : 1982 Method for determination of inclusion content in steel by microscopic method ( first revision ) 4748 : 1988 Methods for estimating average grain size of metals ( first revision )
1.1 This standard covers the requirements relating to the supply of alloy steel forgings for general industrial use in as forged, heat-treated or machined condition. 2 REFERENCES 2.1 The following Indian Standards necessary adjuncts to this standard : IS No.
are
Title
1387 : 1993
General requirements for the supply of metallurgical materials ( second revision )
1499 : 1977
Method for charpy impact test (U-notch) for metals ( first revision )
1500 : 1983
Method for Brinell hardness test for metallic materials ( second revision )
1586 : 1988
Title
3 SUPPLY OF MATERIAL 3.1 General requirements relating to the supply of alloy steel forgings shall conform to IS 1387 : 1967.
Method for Rockwell hardness test for metallic materials (Scales A – B – C – D – E – F – G – H – K) ( second revision )
3.2 Forgings of different steels covered by this standard shall be ordered and delivered on any one of the following basis :
Requirements
Type of Condition of Delivery
A
B
C
D
E
F
G
H
J
K
M
N
Chemical composition
X
X
X
X
X
X
X
X
X
X
X
X
Hardness in as supplied condition Normalized/Annealed/Spheroidized
—
X
X
X
X
X
X
X
X
X
—
—
Microstructure
— —
X
X
—
X
X
X
X
X
—
X
Macrostructure
— —
— —
—
X
X
X
X
X
X
X
Grain Size
—
—
X
X
X
X
X
X
X
X
—
X
Hardenability
—
—
—
X
X
—
—
—
X
X
—
—
Inclusion rating
—
—
X
X
X
X
—
X
X
X
X
X
Mechanical properties in simulated case hardened condition
—
—
—
—
—
—
X
—
X
—
—
Mechanical properties in quenched and tempered condition
—
— —
—
— —
— —
—
X
X
NOTE — ‘X’ indicates the property required. ‘—’ indicates the property not required.
1
— —
IS 4367 : 1991 4 MANUFACTURE
Constituent
4.1 Forgings shall be manufactured from steel produced by open-hearth, electric or any other approved process. Steel shall be fully killed. Steel may be processed through ingot or continuous casting route with sufficient reduction as per agreement with the suppliers.
Chromium Nickel Molybdenum Copper Vanadium Tin Boron
4.2 In case of ingot, sufficient discard shall be made to ensure freedom from pipe, marked segregation and other harmful defects.
Percent 0.30 0.30 0.05 0.25 0.05 0.05 0.000 3
NOTES 1 Trace elements (Cr+Ni+Mo) when added together should not exceed 0.50 percent.
4.3 The amount of hot working and finishing temperature shall be such as to ensure complete soundness and adequate uniformity of structure and mechanical properties after heat treatment. The forgings shall not be produced from overheated stock.
2 Percent copper + 10 × (Percent tin) should not exceed 0.50 percent.
7.2 Check Analysis The permissible variation in the case of product from the limits specified in Table 1 shall be as given in Table 2.
4.4 Forgings shall be suitably heat-treated or cooled after forging to avoid cracks or flakes and shall be finished as nearly as practicable to the dimension of the drawing supplied or within the tolerances mutually agreed upon between the supplier and the purchaser.
8 SELECTION OF TEST SAMPLES 8.1 The ladle analysis shall be furnished by the supplier. If check analysis is required, at least one sample per heat shall be taken. 8.2 For small forgings, with ruling section equivalent to a diameter of 30 mm or less, separate test samples shall be provided from th e bars or billets from which forgings are made. They shall be similarly and simultaneously heat-treated with the forgings they represent.
5 FREEDOM FROM DEFECTS 5.1 The forgings shall be free from any harmful internal and surface defects, such as cracks, laps, seams and slag inclusion. The forgings may be tested by physical inspection, ultrasonic flaw detector and macro-etch, magnetic particle testing method, as agreed to between the purchaser and the manufacturer.
8.2.1 For forgings with a ruling section exceeding 30 mm, the test samples for mechanical properties shall be mutually agreed to between the purchaser and the manufacturer.
5.2 Maximum depth of total decarburization and other surface defects shall not exceed 80 percent of the machining allowance or as specially agreed to with the supplier.
8.2.1.1 For forgings more than ruling section of 100 mm, separate test bar of equivalent ruling section shall be forged from the s ame stock, and heat-treated along with forgings and shall be tested. If found passing the test it shall be acceptable for batch of forgings. Alternately, an integral test sample may be provided in the forging itself and tested for acceptance.
5.3 The forgings shall be free from scale. 5.4 Defects in forgings may be repaired with prior consent of the purchaser.
8.2.2 For case hardening steel, where the size of the forging is greater than 30 mm diameter separate test bars shall be prepared by forging or by machining or by both to 30 mm; but for smaller sizes the test bars shall be heat-treated in the full section. The test pieces shall be blank-carburized and then refined and hardened as specified in the individual specification, except that by agreement between the supplier and the purchaser carburizing or blank-carburizing may be omitted. One tensile and one impact test shall be taken per heat.
6 TOLERANCES 6.1 Tolerances for forgings shall be as specified in IS 3469 (Parts 1 to 3) : 1974. In special cases, tolerances shall be as agreed to between the supplier and the purchaser. 7 CHEMICAL COMPOSITION 7.1 The ladle analysis of alloy steel forgings shall be as given in Table 1. 7.1.1 Elements not specified in Table 1 shall not be added to steel, except when agreed, ot her than for the purpose of finishing the heat and shall not exceed the limits which are as follows :
8.3 Unless otherwise agreed to between the purchaser and the manufacturer, one set of samples as specified in 8.2 and 8.2.1, shall be made per heat per heat-treated batch. 2
Table 1 Chemical Composition of Low Alloy Steels ( Clauses 7.1, 7.1.1 and 7.2 ) Designation as per IS 1762 (Part 1) : 1974
C
Si
Mn
Ni
Cr
Mo
V
Al
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
20C15
0.16–0.24
0.10–0.35
1.30–1.70
—
—
—
—
—
15Cr3
0.12–0.18
0.10–0.35
0.40–0.60
—
0.50–0.80
—
—
—
16Mn5Cr4
0.14–0.19
0.10–0.35
1.00–1.30
—
0.80–1.10
—
—
—
20Mn5Cr5
0.18–0.22
0.10–0.35
1.00–1.40
—
1.00–1.30
—
—
—
21Cr4Mo2
0.26 Max
0.10–0.35
0.50–0.80
—
0.90–1.20
0.15–0.30
—
—
07Cr4Mo6
0.12 Max
0.15–0.60
0.40–0.70
0.30 Max
0.70–1.10
0.45–0.65
—
—
10Cr9Mo10
0.15 Max
0.50 Max
0.40–0.70
0.30 Max
2.00–2.50
0.90–1.10
—
—
13Ni13Cr3
0.10–0.15
0.10–0.35
0.40–0.70
3.00–3.50
0.60–1.00
—
—
—
15Ni16Cr5
0.12–0.18
0.10–0.35
0.40–0.70
3.80–4.30
1.00–1.40
—
—
—
15Ni5Cr4Mo1
0.12–0.18
0.10–0.35
0.60–1.00
1.00–1.50
0.75–1.25
0.08–0.15
—
—
15Ni7Cr4Mo2
0.12–0.18
0.10–0.35
0.60–1.00
1.50–2.00
0.75–1.25
0.10–0.20
—
—
16Ni8Cr6Mo2
0.12–0.20
0.10–0.35
0.40–0.70
1.80–2.20
1.40–1.70
0.15–0.25
—
—
36Si7
0.33–0.40
1.50–2.00
0.80–1.00
—
—
—
—
—
37C15
0.32–0.42
0.10–0.35
1.30–1.70
—
—
—
—
—
35Mn6Mo3
0.30–0.40
0.10–0.35
1.30–1.80
—
—
0.20–0.35
—
—
40Cr4
0.35–0.45
0.10–0.35
0.60–0.90
—
0.90–1.20
—
—
—
40Cr4Mo3
0.35–0.45
0.10–0.35
0.50–0.80
—
0.90–1.20
0.20–0.35
—
—
35Ni5Cr2
0.30–0.40
0.10–0.35
0.60–0.90
1.00–1.50
0.45–0.75
—
—
—
40Ni6Cr4Mo3
0.35–0.45
0.10–0.35
0.40–0.70
1.25–1.75
0.90–1.30
0.20–0.35
—
—
40Ni10Cr3Mo6
0.36–0.44
0.10–0.35
0.40–0.70
2.25–2.75
0.50–0.80
0.40–0.70
—
—
25Cr13Mo6
0.20–0.30
0.10–0.35
0.40–0.70
0.30 Max
2.90–3.40
0.45–0.65
—
—
55Si7
0.50–0.60
1.50–2.00
0.80–1.00
—
—
—
—
—
50Cr4V2
0.45–0.55
0.10–0.35
0.50–0.80
—
0.90–1.20
—
0.15–0.30
—
20NiCrMo2
0.18–0.23
0.20–0.35
0.70–0.90
0.40–0.70
0.40–0.60
0.15–0.25
—
—
37Mn5Si5
0.33–0.41
1.10–1.40
1.10–1.40
—
—
—
—
—
(1)
3
NOTES 1 Sulphur and phosphorus can be ordered as per following limits: i) S & P — 0.030 Max ii) S 0.02-0.035 and P 0.035 Max 2 When the steel is Al kilied, to tal Al content shall be between 0.02-0.05 percent.
IS 4367 : 1991 9 MECHANICAL PROPERTIES
9.4 Impact Test
9.1 The mechanical properties of alloy steel forgings shall be as given in Table 3.
9.4.1 Izod Impact Test
9.1.1 In case the forgings are supplied in annealed or normalized condition, the properties shall be mutually agreed to between the supplier and the purchaser, unless the test samples are separately heat-treated in which case they shall conform to the requirements as given in Table 3. 9.1.2 In case of hardening steel, the properties shall conform to the requirements as specified in Table 3. When the test sample is smaller than 30 mm diameter, the properties shall be subject to mutual agreement between the supplier and the purchaser.
Izod impact test, where specified shall be carried out on test pieces machined from the test sample selected as in 8 in accordance with IS 1598 : 1977. 9.4.2 Charpy Impact Test Subject to mutual agreement between the purchaser and the manufacturer, charpy impact test may be carried out in place of izod impact test in accordance with IS 1499 : 1977. 10 MACROSTRUCTURE
9.3 Hardness Test
10.1 The macrostructure shall meet the following requirements : a) Macrostructure shall be free from harmful porosity, slag inclusions, rolled in scale, coarse dendrites, harmful segregation and cracks. b) The flow lines shall follow the contour of the forging. Flow lines shall not cut the contour.
9.3.1 Brinell Hardness Test
11 INCLUSION RATING
9.2 Tensile Test Tensile test shall be carried out in accordance with IS 1608 : 1972.
Brinell hardness test, where specified, shall be carried out in accordance with IS 1500 : 1983. 9.3.2 Rockwell Hardness Test
11.1 When tested in accordance with IS 4163 : 1982, the non-metallic inclusions shall not exceed 3 thin and 2 thick in grades A B C D, unless otherwise agreed to.
I S 4 3 6 7 : 1 9 9 1
IS 4367 : 1991 9 MECHANICAL PROPERTIES
9.4 Impact Test
9.1 The mechanical properties of alloy steel forgings shall be as given in Table 3.
9.4.1 Izod Impact Test Izod impact test, where specified shall be carried out on test pieces machined from the test sample selected as in 8 in accordance with IS 1598 : 1977.
9.1.1 In case the forgings are supplied in annealed or normalized condition, the properties shall be mutually agreed to between the supplier and the purchaser, unless the test samples are separately heat-treated in which case they shall conform to the requirements as given in Table 3.
9.4.2 Charpy Impact Test Subject to mutual agreement between the purchaser and the manufacturer, charpy impact test may be carried out in place of izod impact test in accordance with IS 1499 : 1977.
9.1.2 In case of hardening steel, the properties shall conform to the requirements as specified in Table 3. When the test sample is smaller than 30 mm diameter, the properties shall be subject to mutual agreement between the supplier and the purchaser.
10 MACROSTRUCTURE
9.3 Hardness Test
10.1 The macrostructure shall meet the following requirements : a) Macrostructure shall be free from harmful porosity, slag inclusions, rolled in scale, coarse dendrites, harmful segregation and cracks. b) The flow lines shall follow the contour of the forging. Flow lines shall not cut the contour.
9.3.1 Brinell Hardness Test
11 INCLUSION RATING
9.2 Tensile Test Tensile test shall be carried out in accordance with IS 1608 : 1972.
11.1 When tested in accordance with IS 4163 : 1982, the non-metallic inclusions shall not exceed 3 thin and 2 thick in grades A B C D, unless otherwise agreed to.
Brinell hardness test, where specified, shall be carried out in accordance with IS 1500 : 1983. 9.3.2 Rockwell Hardness Test
12 GRAIN SIZE
Rockwell hardness test, where specified, shall be carried out in accordance with IS 1586 : 1988.
12.1 Austenitic grain size shall be between 5-8 when tested in accordance with IS 4748 : 1988.
Table 2 Variation for Check Analysis Constituent
Maximum of Specified Range
Variation for Maximum Size, mm
Up to 250
Percent Carbon Silicon Manganese Nickel
Chromium
Molybdenum Vanadium Sulphur Phosphorus
Up to 0.45 Over 0.45 to 0.90 Up to 0.40 Over 0.40 to 2.0 Up to 1.20 Over 1.20 to 2.0 Up to 1.0 Over 1.0 to 2.2 Over 2.2 to 5.0 Up to 0.80 Over 0.80 to 2.2 Over 2.2 to 5.5 Up to 0.40 Over 0.40 to 1.2 Up to 0.15 Over 0.15 to 0.30 — —
Percent (±)
Over 250 Up to 500 Percent (±)
0.02 0.03 0.03 0.05 0.04 0.05 0.03 0.05 0.07 0.03 0.05 0.11 0.03 0.04 0.02 0.03 0.005 0.005
0.04 0.05 0.04 0.06 0.06 0.07 0.03 0.05 0.07 0.04 0.06 0.13 0.04 0.05 0.02 0.03 0.010 0.010
NOTE — Variations shall not be applicable both over and under the specified limits in several determinations in a heat.
4
IS 4367 : 1991 13 ADDITIONAL TESTS
the original test sample was taken unless forging has been withdrawn by the manufacturer.
13.1 Subject to mutual agreement between the supplier and the purchaser, the following optional tests as applicable may also be carried out. Method for tests may be followed as given in respective/available Indian Standards.
14.2 The mechanical properties obtained from the test pieces prepared from the two further test samples shall comply with the specified requirements.
a) Metallographic test, b) Non-destructive soundness, and
test
for
15 MARKING
internal
15.1 Unless agreed otherwise between the supplier and the purchaser, each forging shall be clearly marked with the following information : a) Indication of the source of manufacture, b) Steel designation, and c) Identification mark by which it can be traced to the heat number of steel from which the forging was made.
c) Fracture test. 14 RETESTS 14.1 Should any of the original test pieces fail to pass the mechanical tests specified in 9, two further test samples shall be selected for retest for each test sample that failed. One of the test samples shall be taken from forging from which
ANNEX A ( Foreword ) INFORMATION TO BE FURNISHED BY THE PURCHASER A-1 BASIS FOR ORDER
b) Condition of supply, c) Test required, d) Method of manufacture, e) Any special requirements, and f) Test report, if required.
A-1.1 While placing an order the purchaser should specify clearly the following : a) Grade designation,
5
I S
Table 3 Mechanical Properties of Forgings ( Clauses 9.1, 9.1.1 and 9.1.2 ) Mechanical Properties in Heat-Treated Co ndition Designa tion
Maximum Hardne ss in Soft Annealed Condition HB
Condition
Tensile Strength MPa
Yield Strength Min MPa
% Elongation Min Gauge Length 5.65 √S0
Izod Impact Value Min Joules
Hardness HB
Limiting Ruling Section mm
1
2
3
4
5
6
7
8
9
200
H&T
600–750
400
18
50
178–221
700–850
460
16
50
208–252
30
600–750
440
18
50
178–221
150
700–850
540
18
48
208–252
100
800–950
600
16
48
235–280
63
600 Min
—
13
48
—
30
20C15 37C15
15Cr3
220
170
–do–
R, Q & S.R.
4 3 6 7 : 1 9 9 1
63
(Core Properties) 6
16Mn5Cr4
207
–do–
800 Min
—
10
35
—
30
20Mn5Cr5
217
–do–
1 000 Min
—
8
38
—
30
13Ni13Cr3
229
–do–
850 Min
—
12
48
—
60
15Ni16Cr5
241
–do–
1 350 Min
—
9
35
—
30
15Ni5Cr4Mo1
217
–do–
1 000 Min
—
9
41
—
30
15Ni7Cr4Mo2
217
–do–
1 100 Min
—
9
35
—
30
16Ni8Cr6Mo2
229
–do–
1 350 Min
—
9
35
—
30
20NiCrMo2
213
–do–
900 Min
—
11
41
—
30
36Si7
217
H&T
800–950
—
—
—
235–280
100
37Mn5Si5
217
–do–
780–930
590
14
—
—
—
55Si7
245
–do–
1 300–1 500
—
—
—
380–440
100
35Mn6Mo3
220
–do–
700–850
540
18
55
208–252
150
800–950
600
16
55
235–280
100
900–1 050
700
15
50
268–311
63
1 000–1 150
800
13
45
295–341
30
700–850
540
18
55
208–252
100
800–950
600
16
55
235–280
63
900–1 050
700
15
50
266–311
30
5
6
7
8
9
40Cr4
220
–do–
Table 3 ( Concluded ) 1
2
3
07Cr4Mo6*
170
N&T
380–550
225
19
60
—
40
10Cr9Mo10*
187
–do–
410–590
245
18
55
—
50
520–680
310
18
50
—
650–800
420
16
60
190–235
150
700–850
460
15
55
208–252
100
800–950
580
14
50
235–280
40
700–850
540
18
55
208–252
150
800–950
600
16
55
235–280
100
900–1 050
700
15
50
266–311
63
1 000–1 150
800
13
45
295–341
30
900–1 050
700
15
55
266–311
150
1 000–1 150
800
13
48
295–341
150
1 100–1 250
880
12
41
325–370
100
1 30 0
8
15
450 Min
63
700–850
540
18
55
208–252
150
800–950
600
16
55
235–280
100
900–1 050
700
15
50
266–311
63
900–1 050
700
55
55
266–311
150
1 000–1 150
800
13
48
295–341
100
1 100–1 250
880
11
41
325–370
63
1 200–1 350
1 00 0
10
30
355–399
30
1 000–1 150
800
12
48
295–341
150
1 100–1 250
880
11
41
325–370
150
1 200–1 350
1 00 0
10
35
355–399
150
21Cr4Mo2
40Cr4Mo3
7
25Cr13Mo6
210
220
230
H&T
–do–
–do–
4
1 550 Min 35Ni5Cr2
40Ni6Cr4Mo3
40Ni10Cr3Mo6
50Cr4V2
220
230
250
240
H&T = Hardened and Tempered.
–do–
–do–
–do–
–do–
—
1 550 Min
130
8
15
450 Min
100
900–1 100
700
12
45
266–325
100
1 000–1 200
800
10
45
295–355
40
N&T = Normalised & Tempered.
R, Q & SR = Refined, Quenched & Stress Relieved.
*All properties for guidance only. Other values may be mutually agreed between the customer and the supplier.
I S 4 3 6 7 : 1 9 9 1
Table 3 ( Concluded ) 1
2
3
07Cr4Mo6*
170
N&T
10Cr9Mo10*
187
–do–
21Cr4Mo2
40Cr4Mo3
7
25Cr13Mo6
210
220
230
H&T
–do–
–do–
4
5
6
7
8
9
380–550
225
19
60
—
40
410–590
245
18
55
—
50
520–680
310
18
50
—
650–800
420
16
60
190–235
150
700–850
460
15
55
208–252
100
800–950
580
14
50
235–280
40
700–850
540
18
55
208–252
150
800–950
600
16
55
235–280
100
900–1 050
700
15
50
266–311
63
1 000–1 150
800
13
45
295–341
30
900–1 050
700
15
55
266–311
150
1 000–1 150
800
13
48
295–341
150
1 100–1 250
880
12
41
325–370
100
1 30 0
8
15
450 Min
63
700–850
540
18
55
208–252
150
800–950
600
16
55
235–280
100
900–1 050
700
15
50
266–311
63
900–1 050
700
55
55
266–311
150
1 000–1 150
800
13
48
295–341
100
1 100–1 250
880
11
41
325–370
63
1 200–1 350
1 00 0
10
30
355–399
30
1 000–1 150
800
12
48
295–341
150
1 100–1 250
880
11
41
325–370
150
1 200–1 350
1 00 0
10
35
355–399
150
1 550 Min
130
8
15
450 Min
100
900–1 100
700
12
45
266–325
100
1 000–1 200
800
10
45
295–355
40
1 550 Min 35Ni5Cr2
40Ni6Cr4Mo3
40Ni10Cr3Mo6
50Cr4V2
220
230
250
240
H&T = Hardened and Tempered.
–do–
–do–
–do–
–do–
N&T = Normalised & Tempered.
R, Q & SR = Refined, Quenched & Stress Relieved.
*All properties for guidance only. Other values may be mutually agreed between the customer and the supplier.
—
I S 4 3 6 7 : 1 9 9 1
Standard Mark The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, testing and quality control which is devised and supervised by BIS and operated by the producer. Standard marked products are also continuously checked by BIS for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards.
Bureau of Indian Standards
BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. Copyright
BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publications), BIS. Review of Indian Standards
Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Catalogue’ and ‘Standards : Monthly Additions’. This Indian Standard has been developed from Doc : No. MTD 18 (3683). Amendments Issued Since Publication Amend No.
Date of Issue
Amd. No. 1
November 1994
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