IS : 1570(Part
2/Set 1) - 1979 ( Reaffirmed 1998 )
Indian Standard SCHEDULES FOR WROUGHT STEELS PART 2 Section 1
CARBON
STEELS (UNALLOYED
STEELS)
Wrought Products ( Other Than Wires) With Specified Chemical Composition and Related Properties
(:
First Revision )
( Third Reprint JANUARY 1999 ( IncorporathgAmendment No. 1)
UDC
669.14
(083.4
)
0 Copyright 1999 BUREAU MANAK
Gr 5
OF
BHAVAN,
INDIAN
STANDARDS
9 BAHADUR SHAH NEW DELHI 110002
ZAFAR
MARG
October 1979
1s : 1s7o(Paft
2/set 1) - 1979
Indian Standard SCHEDULES FOR WROUGHT STEELS PART 2 CARBON STEELS (UNALLOYED STEELS) Section 1 Wrought Products (Other Than Wires) With Specified Chemical Composition and Related Properties (
First Revision )
Alloy Steels and Special Steels Sectional Committee, SMDC Chairman
19
Repesmling
DR G. MUKHERJEE
Steel Authority Durgapur
S~nr
Guest,
A. N. BISW,\S SH~I S. K. BASU ( Alter&e) Saar B. C. BISWAS SRRI A. M. BISWAS ( dlfernarc ) SHRI P. K. CEIAKIZAVAHTY DR T. MUKHERJEE ( Alternate)
Keen,
National The Tata
of India Ltd (Alloy
Williams
Test House,
Steels Plant ),
Ltd, Howrah Calcutta
Iron & Steel Co Ltd, Jamshedpur
SHRI P. K. CHATTCKJEE
,_ MifiTtry of Defence ( DC1 ) SHI~I P. K. GAN~OPADHYAY ( Auernare ) Nationa! Metallurgical Laboratory (CSIR ), SHRI K. M. CI~AUDIIU~Y Jamshedpur The Visvesvaraya Iron & Steel Ltd, Bhadravati SHnI DASARATIIA SHRI B. C. BASAVA~AJ (Alternate ) Ahmedabad Advance Mills Ltd, Navsari SHRI S. V. D~TAR SRRI M. K. Gnosn ( AItemate) The Indian Tool Manufacturers Ltd, Bombay SHRI h. D. DIAS Steel Authority of India Ltd ( Alloy Steels Plant ), SHBI M. K. DATTA Durgapur SHRI R. C. JHA ( Alternale ) Directorate General of Supplies & Disposals SHRI S. B. GUPTA ( Inspection Wing), New Delhi SIIRI P. K. GYNE ( Affernafe ) JOINT DIRECTOR (MET), RESEARCH Ministry of Railways DESIQNS AND STANDARDS ORGANIZATION D~PIJTY DIRECTOX ( MET-II_), RDSO ( Alfernate ) ( Continued on page 2 )
@ Copyrighf 1979 BUREAU
OF
1NDIAN
STANDARDS
This publication is prorertrd under the Indian Co$yigL Act ( XIV of 1957) and reproduction in whole or in part by any means except with written permission of the oublisher shall be deemed to be an infringement of copyright under the said Act.
IS : 1570(Part
2/Set 1) - 1979
( contimsed~ompage1 ) Reprcseafing
Members S~sr
S. R. KHARE SHBI V. N. PANDAY ( Ahnate ) SERI R. S. KOTHAWALE Saab S. S. LAKKUNDI ( Allcraals) DE D. P. LAEIBI SHBI I. N. BHATIA ( Afremek ) SHRI K. N. bfEHl%A SRRI D. K. DAS ( Altmafr ) SHEI L. MIEEBA
Indian
Register
Bharat
Forge Co Ltd, Mundhwa,
Ministry Heavy
of Shipping, Bombay
of Defence Engineering
Pune
(R & D ) Corporation
Ltd, Ranchi
Directorate General of Technical Development, New Delhi San1 M. K. BANERJEE ( Al&mu&) Ashok Leyland Ltd, Madras Saul A. PADMANABHAN Firth India Steel Co Ltd, Thane SEaI I. M. PA1 Saxr B. M. PA1 ( Aftmatc ) Mahindra Ugine Steel Co Ltd, Bombayj and Alloy Dg R. V. PATEY Steel Producers’ Association of India, Bombay SHRI R. NARAYANA ( Al&mate ) Mahindra Ugine Steel Co Ltd, Bombay Iron & Steel Control, Calcutta SHRI M. K. PRAMANIK SARI S. S. SAHA ( A&mats ) Research & Development Centre for Iron and DE V. RAMASWAYY Steel ( HSL ), Ranchi SHRI S. R. MEDIRATTA ( Altcmafe ) Hindustan Machine Tools Ltd, Bangalore Sanx M. RAN~ASHAI San1 SANJIT SEN (AIlmate I) SwnrP. RAMA PBASAD ( AIlera& II ) The Tata Engineering and Locomotive Co Ltd, SEEI A. K. ROY
DR S. K. MONDAL ( Alternuls)
SHRI D. SIZINIVASAN Da S. K. CEATTEBJEE ( Altmafc) SHRI Y. C. SIJBRAHWANYA SHRI K. S. VAIDYANATHAN SARI C. J. DAVE ( Altmate ) SRB~ C. R. RAMA RAO, Director ( Strut & Met )
Jamshedpur
Steel Furnace
Association
of India,
Calcutta
Ministry of Defence ( DGOF ) M. N. Dastur & Co Pvt Ltd, Calcutta Director
General,
IS1 ( Ex-ofiio Member )
hretary SHRI VIJAY KUMAR Assistant Director ( Metals ), IS1
Subcommittee for the Revision of Schedule for Wrought Steel for General Engineering Purposes, SMDC 19 : 5
San1 P. K. CEAKRAV~TY
The,Tata
Iron i?z Steel Co Ltd, Jamshedpur
Membm SHRI S. K. BABU P. K. CRATTERJEE Sunr M. K. SEN ( Alternafa )
SERI
Guest, Keen, Williams Ltd, Howrah Ministry of Defence ( DGI ) ( Coatinued on page 18 )
2
IS : 1!57O(Part 2/Set 1) - 1979
Indian Standard SCHEDULES FOR WROUGHT STEELS PART 2
CARBON STEELS (UNALLOYED STEELS\
Section 1 Wrought Products (Other Than Wires) With Specified Chemical Composition and Related Properties
( First Revision ) 0.
FOREWORD
0.1 This Indian Standard ( Part II ) ( First Revision ) was adopted by the Indian Standards Institution on 5 March 1979, after the draft finalized by the Alloy Steels and Special Steels Sectional Committee had been approved by the Structural and Metals Divisjon Council.
0.2 Schedules for wrought steels for general engineering purposes ( IS :
1570-1961 ) was first published in 1961. On the basis of the experience gained in the production and use of steels, the Sectional Committee has The other parts of decided to revise the standard and issue it in parts. the standard are as follows: Part I Steels specified by tensile and/or yield properties Part III Carbon and carbon manganese free cutting steels Part IV Alloy steels ( excluding stainless and heat-resisting steels ) Part V
Stainless and heat-resisting
steels*
Part VI Tool steels, 0.3 The following major modifications have been made in this revision: a) Steel designations have been modified in -accordance with IS : 1762 ( Part I )-1974t. However, for the sake of easy identification old designations are also given within brackets. b) New grades 2C2, 5OC8,6OC6 have been added. c) .Manganese content of grades CO5 ( 5C4 ), C55 ( 55C4 ), and C60 ( 6OC4 ) have been modified. d) Mechanical properties for cold-drawn bars given in Table 3 have been modified on the basis of experience gained. *Already published as IS : 1570 ( Part V )-1972. tCode for designation of steels: Part I Based on letter symbols.
3
B
: %7o(p8tt
2/&C
1) - 1979
0.4 This schedule does not give limits for sulphur and phosphorus. These have to be specified in the detailed specifications. The standard ranges for sulphur and phosphorus and the method for designating steel according to its sulphur and phosphorus content, steel making practice and method of deoxidation is detailed in Appendix ‘ A ’ for information. 0.5 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*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. 1. ScofE
1.1 This schedule ( Part II ) is applicable to standards for carbon steels when it is necessary for the steel to be supplied to a composition within reasonably defined limits. This schedule is not intended to be used as a standard. 1.1.1 This schedule may be used for ordering steels provided specification is available for the particular steel.
no detailed
2. GENERAL
2.1 While
or revising existing standards, preparing Indian Standards, steels listed in this schedule shall be selected. The specification of mechanical properties different from those. given in this schedule should not be made unless special conditions of service render this essential. In that event, full reasons for the proposed departure from the steels specified in this schedule shall be submitted to the Alloy Steels and Special Steels Sectional Committee, SMDC 19, and its approval obtained. 2.2 In addition to specified mechanical properties, ranges for carbon and manganese are, laid down in the schedule ( see Table 1 ), but as in many cases, the steels of lower carbon content are required as rimming, semikihed or killed steel depending on the subsequent manipulation and conditions of service, the silicon content has not~been specified. Where necessary, the silicon content or the type of steel, for example, killed, semi-killed, Since different levels of sulphur etc, should be included in the standard. and phosphorus are required according to the severity of the conditions in service, limits for these elements are also not included in the schedule but should be specified in a specification at levels appropriate to the method of steel production, conditions of service, etc. *Rules
for rounding
off numerical
values
(rcvhcd).
4
IS : 157O(Paft TABLE i
(IPECIPPID
CARBOhIAND
C
STE~CL DWIWATION [ SC6IS: 1762 (PABT I)-19741
PBlWQtT
2/Set
1)
l
1979
MANGANESE LIMITS
Mn
hBCBNT
~_-_-_-_---_~
New
Old
(1)
(2)
2c2 4c2 ~5C4 7C4 lOc4 14c6 l5c4 15c8
(4) 0.40 &fax 0.40 1”wix 050 Mu 0.50 Md*
IS : 48S2,4397 -
(Cl4)
(3) 0.05 &&TX 0.09 Mai *lo Max 0.12 Max O-15 Max &IO-O*18
0’40-0-70
IS IS
(C15) (C15Mn75)
0.20 Max 0*10-O-20
0*30-0.60 0-609’90
(s-4~) (co5) (co7) (-Cl0 )
2oc8 25C4 25C8
(c20) (~25) ( C25MnE
3oc8
(C30)
3m 35c9
(C35) ( C35Mn75-
4oc8 45C8
(C40)
5oc4 5Oc8 5OC12 55c4
(C50) -
5503 6Oc4 6OC6 65C6 7OC6 75C6 8OC6 85C6 98C6 llYC6
)
)
(C45)
(CSOML
)
040-0%6
0-15-0’25 0*20-0*30 ocm0.30
0*60-090 0~30-0%0 0%0-o-90
O-25-0-35
0+0-090
@30;040 9.3~0’40
~3O-O%g o%O-0.90
@35-0.45 O-40-050
0%0-O% 0*60@0
0-45-O-55 0.45.q55 O-45-0.65 0.50.0.60
O-30-O-60 0’60-0~ 1~10-1’40 0’30-060
@50-OfrJ
: 1812,2879,4432 : 1875, 2004, 4432,
5489 IS : 1812 IS :;U&lj, 6’y27, IS
1875,
9 -
: 1875,2004 -
IS : 1875, 2004, 3930, 5517, 6967 IS : 1875, 2004, 3930, 5517,6967 IS : 1t;X,7 2004, 3930, IS : 5517,7226, 7283 IS : 1875,2004, 2507, 3930, 3261,5517 . IS : 5517 IS
: 2507, 3885, 3930
o%O-0.90
IS
: ;8;;
(0)
0.55-0.65 0.55~0.65 @60-O-70
O%W60 ~50-0*80 0’50-0-80
IS
: 1875, 2004,2507,
(C70) (C75) (C80) (C85) (C98) ( Cl13 )
0*65-0.75 0*70-0.80 0.75-0.85 0.80.0.90 090-1.05 1.05-l-20
0*50-0.80 0.50.0.80 @50-O-80 0.50-O-80 0*50-O-80 0*50-0.80
(C55) ( C55Mn72) (C60)
7226.8054.8055 3445; 5517,
4072 IS : 2507,4072,7226 IS : 2507, 3885 IS : 2507.4072 IS : 2507,7226 IS ~2507, 3195, 7226 IS : 3195
IS : 1570(Part
2Bec 1) - 1979
2.3 This schedule includes specified tensile properties applicable to the different conditions, for example, Table 2 gives values for the hot-rolled or These values are based on ruling sections up to normalized conditions. 150 mm and for larger sizes,some adjustment of the specified tensile range for a particular range of composition, or conversely, of the specified composition for a particular range .of tensile’ strength, may be necessary. Mechanical properties for cold-drawn bars and for hardened and tempered bars and forgings, together with the &es, to which these properties are applicable are given in Tables 3 and 4. Table 5 gives-the properties for case-hardening steels, that is, the properties obtainable in the core of casehardened parts after refining and quenching. Some of the steels are used in the form of sheet and strip and tubes and the tensile properties of these are given in Tables 6, 7 and 8. For some purposes, a minimum yield stress is regarded as specification requirement and minimum yield stress values are, therefore, given for some of the physical conditions for inclusion in specifications, if required. Information on the assessment of the ruling section of bars, forgings and parts is given in Tables 9 and 10. 2.4 In addition, values for the specified minimum percentage elongation -corresponding to the specified tensile ranges are included. Different types of test pieces are used for the tensile test depending on the form of the material; for example, flat test pieces for thin plates, sections and flat bars; unniachined Found test pieces for small size round bars; and machined round test pieces for thicker plates, for larger size round bars and for square bars, and forgings. Since the percentage elongation depends on the relation between the gauge length and the cross-sectional area of the test piece, specified minimum values for the percentage elox?gation for the different types of test pieces are included in the schedule. These elongation values given are based dn a gauge length of 5*65drwhich is now internationally accepted. If test pieces of other than 5*6Wxgauge length are used, elongation conversion may be obtained from IS : 3803-1974*. 2.5 For tensile tests on tubes, the specified percentage elongation should be’ based on the recently adopted formulae of either ,950 divided by !the actual tensile strength in kgf /mm* when using a gauge length equivalent to P65dxor of 1 100 divided by the actual tensile strength in kgf /mm* when using a gauge length equivalent to 44x 2.6 The notch toughness of steels after hardening and tempering is sometimes assessed by an impact test and values for incorporation in speci&ations; if required, are given in the relevant tables of the schedule, *Method
for elongation
conversions
for steel (jut
6
revision).
IS : 1570(Part
2/Set
1) - 1979
TABLE 2 SPECIFIED TENSILE LIMITS FOR PLATES, SEGTIONS, BARS, BILLETS AND FORGINGS IN THE HOT-ROLLED OR NORMALIZED CONDITION ( Clause 2.3) TENSILE STRENGTH
DESIGNATION ~_____A-__~
New
Old
(1)
(2)
(3)
ELONQATIO& PEBCENT,‘Min
(4)
MPa* 7c4 lOC4 14C6 15c4 15C8
(C07) (ClO) (Cl4) (C15) ( Cl5MnZ_5 )
320-400 340-420 370.458 370490 420-500
27 26 26 25 25
2OC8 25C4 25C8 3OC8 35c4 35C8 4OC8 4568 5oc4 5oc13 55C8 6OC4 65C6
(C20) ( C25 ) ( C25MnF
448-520 448-548 470-570 500-600 520-620 550-650 580680 630-7 10 660-780 720 Min 720 Min 750 Min 750 Min
24 23 22 21 20 20 18 15 13 11 13 11 10
)
(C30) (C35) ( C35Mn7J ) (C40) (C45) (C50) ( C50Mnl) ( C55Mn75) (C60)(C65)
NOTE- Minimum values for the yield stress may be required in certain specifications and in such cases-a minimum yield stress of 55 percent of the minimum tensile strength should be satisfactory. +lMPa = lN/mme = O-1020 kgf/mme.
2.7 The specified mechanical properties are applicable to test samples taken from a standard location which’ should be included in the specification. 2.8 Any tests, for example, bend test, flattening tests on tube, etc, additional to the tests given in this schedule should also be specified in the standard as appropriate.
7
TABLE 3
SPECIFIED
5
TENSILB LIMITS FOR COLD-DRAWN BABS
s
[ Clauru 0.3(d) and 2.3 ] DEBIQNATION cl----y New Old
UP #---A---_~ Tensile Strength Min
00
Ovm 20 mm
TO 20 XIim
OvEa 40 mm UP TO 63 mm
UPTo4Omm Elongation c--hp-l Percent, Min Tensile Strength bfin
Elongation Percent, Min
‘Tensile---y “Zgth
Elongation Percent, iUia
0-s
63 mm
Tensile Strength iuia
Elongation f Percent, ~Uin t 3
(1)
(2)
(3) MPa+
(4)
(5) MPa@
(6)
(7) MPa*
(8)
(9) MPa*
(10)
1oc4 15C8
(ClO) (C15Mn%)
490 540
11 11
450 510
13 13
410 470
15 15
360 430
18 18
10 9 8 7 7
510 570 610 630 690
12 10 9 8 8
470 530 570 610 670
15 12 10 9 9
430 490 540 590 630
18 15 12 10 10
2OC8 3OC8
(C20) (C30)
540 610
4OC8 5oc4 55C8
(C40) (C4.0) ( C55Mnz)
640 670 730
*IMPa = lN/mma = O-1020 kgf/mm%
I!
--7
r--
IS : 1570(Part 2/Set 1) - 1979 TABLE 4 SPECIFIED MECHANICAL PROPERTIBS FOR BARS AND FORGINGS IN THE HARDBNBD AND TBMPERBD CONDlTION ( Claus&2.3 ) DESIONATION r--> New
Old
TENSILE STWN~TH
ELONGATION, PERCENT,
YIRLD STREsfB
Min
(1r
Mill
3OCJ3 35C8
(2) (C3O) ( C35Mns)
(3) MPae
(4) MPae
(5)
SFEOUIED) (6) Joules
(7) mm
600-750
rww)
18
55
30
600-750
400
18
55
63
18 17
41 35
100 30
::
.lOO 30
45c8
:: (C5O)
SECTlOlZ
Ma
44x8
5oc4
LIMITING RULTN~
VALUE,
sPlroxrIED) (IS
(1)
IZOU IMPACT
700-850 800-950
-
15 1s
46O 540
63 30
15 13 *IMPa
= lN/mmr I 0.102 0 kgf/mm%
TABLB 5s;~S~D~CHANICAL
PROPERTIBS FOR CASE-HARDENING AND QUENCHED CONDITION ( CORE PROPERTIES )
REFINED
( Cku.u 2.3 ) DESIGNATION -&---_y r-New Old
(1)
(2)
TENSILBI STSENQTE, Min
ELONGATION, PEWENT, Min
IZOD IVPA~T VALUE, Min (II SPWI~IED)
LIXITIN~ RULING SECTION
(3) MPa*
(4)
(5) Joules
(6) mm
lOC4
(ClO)
500
17
55
14c6
(Cl4)
500
17
55
15c8 2oc8
(C15Mn75)
500 500
17 16
55
(C2O)
llMPa = lN\mm* = O-1020 kgf/mma.
9
55
15 Over 15 U$F 30
30
IS : 1570(Part
2/Set
1) - 1979
TABLE 6 SPECIFIED TENSILE LIMITS FOR MILD STEEL SHEET STRIP IN THE COLD-ROLLED AND ANNEALED CONDITION
AND
( Clause2.3 ) DESIGNATION _--h--_-y New Old
(1)
(2)
TENSILE STREFXITH Min
E~~NCUTION, PERCENT, Min, TEST PIECE, WIDTH 12.5 mm, GAUQB LENQTH 50 mm
(3) MPa*
(4)
7c4
(CO71
300-380
28
1oc4
(Cl01
320-400
28
15c4
(C’5)
320-440
25
2OC8
(C20)
390-510
25
llMPa = lN/mma = O-102 0 kgf/mmR
TABLE
7
SPECIFIED TENSILE LIMITS FOR MILD STEEL SHEET STRIP IN THE COLD-ROLLED CONDITION ( Clause 2.3 )
DESIGNATION T__-* ---7 New Old (1)
(2)
1x4
(Cl51
CONDITXON
(3) r Quarter hard
llMPa = lN/mme
(I iZtfhard = 0.102 0 kgf/mm%
10
TENSILE STRBN~TE (4) MPa+ 390-470 470-570 570 Min
AND
IS : 1570(Part TABLE COLD-DRAWN
2/Set
1) - 1979
8 SPECIFIED -TENSILE LIMITS FOR, TUBES IN THE AND ANNEALED CONDITION AND IN THE COLD-DRAWN OR COLD-DRAWN AND TEMPERED CONDITION ( Clause 2.3 )
DESIQNATI~N r-h___-) New Old
COLD-DRAWN AND ANNEALED --_-m-7 Tensile Yield Strength, Stress,
Min
Min
(3)
(4)
COLD-DRAWNOB COLD-DRAWN
ANDTEMPERED
r---_-h---y Tensile Strength,
(2)
14C6 15C4 15C8
( C15Mn7.5 )
2OC8
’ (C20)-‘-
25C8 2X4 35c4 35C8
(C&!n!75 _> ( &-it\5
5OC12 ( C50Mnl 45c:a (C45)_ *lMPa TABLE
\~IDTIi
SECTION
MPa*
MPa*
MPa*
320
170
440
33
370
220
~520
42
390
250
500
46
440
280
580
47
1 2;;
) ) 1 J
520
340
700
60
= 0.102 0 kgf/mms.
9 CONVERSION INTO EQUIVALENT OF
(7)
(6)
(5)
MPa*
)
= lN/mma
Yield Stress,
Mi?l
Min (1)
EI,~N~ATIoN ~PEIICENT, Min
on gauge length = 5*651/T or
I -!l!F
on gauge length
! 1 J
= 41/A
OF RECTANGULAR AND SQUARE SECTIONS RULING SECTIONS, OIL QUENCHING
( Claw 2.3 ) THICKNESSOFSECTICIN ______---__L--_--_-_------_---\ 40 50 60 80 10 20 30 mm mm mm mm mm mm mm
100 mm
120 mm
140 . mm
DIAMETER O~EQUIVALENTROUNDS
(1)
(2)
(3) mm
:x
10 14
;;
4”: 50
17 16 17
22: 31
::
ii17
32 32
:: 17 17
3333 33 33
:: 17 17
z 53
mm
mm
(4)
mm
-
100 120 140 160 180 200 225 250 300 350 and over x
::
:: 33
(5) mm -
(6) mm -
(7) mm -
s 40 43 46 47
(3) mm .-
(9) mm -
-
-
-
1
-
87
48 48 48 48 48
63 63 63
77 77 78
9, 91 z;
:t 48 49
63 5: 63
::
92
7788
!z
Greater than 160 mm.
11
1:;
117 108
108 112 115 117
125 131 136 140
119 120 121 121
143 145 148 150
(10) mm
130 146 148 154
X X X % X
(11) mm
l:i2
X X X X X X X
IS : 157O(Part 2/Set 1) - 1979
TABLE 10 CONVERSION OF RECTANGULAR AND SQUARE SECTIONS INTO EQUIVALENT RULING SECTIONS, AIR COOLING ( C&use 2i3 ) WIDTH OF SECTION
THICENEFMor SBCTION
10 mm
20 mm
30 mm
40 mm
50 mm
60 mm
80 mm
100 mm
120 mm
140 . mm
DIAMETEB OF EQUIVALENT ROUNDS (1) mm
10 20 30 40 50 60 80 100 120 140 160 180 200 225 250 390 350 and over
(21 (3) mm 10 13 15 16 16 17 17 17 17 17 17 18 18 18 18 18 20
20 24 27 29 30 32 33 34 34 34 35 35 35 36 37 39
(4) mm
(5) mm
-
-
30 34 38 41 45 47 49 50 51 51 52 52 53 54 59
-
(6) mm
(7) mm
03) mm
(9) mm
-
1w)
1
45 49 54 58 62 64 66 67 68 69 70 71 78
51 55 62 68 72 76 79 81 83 85 86 88 97
x Greater than 160 mm.
12
61 70 76 82 86 90 93 95 98 100 104 115
-
81 90 98 104 109 114 117 121 125 131 152
102 111 119 126 132 137 142 147 155 X
(10) (11) mm mm 122 132 140 148 154 x x x x
__c 142 152 x x x x x x
IS : 1570(Part
APPENDIX ( Clause 0.4 )
2/Set
1) - 1979
A
NEW SYSTEM OF DESIGNATION OF STEELS A-l. GENERAL A-l.1 The new system of designation of steel is based on the draft IS0 proposal submitted by India to ISO/TC 17 a Steel ’ for formulation of an international standard. Details of the new designation system are given in IS : 1762 ( Part I )-1974*. A-2. STEELS DESIGNATED COMPOSITION
ON THE BASIS OF CHEMICAL
A-2.1 Unalloyed Steels ( as Defined in IS I 759&1974t ) - The code designation shall consist of the following in the order given: a) Figure indicating 100 times the average percentage of carbon content, b) Letter ‘ C ‘, and c) Figure indicating 10 times the average percentage of manganese content. The figure after multiplying shall be rounded off to the nearest integer according to the rules given in IS : 2-1960$ d) If necessary, symbols indicating special characteristics as fellows: 1) Method of designationDepending on whethe: the steel is killed, semi-killed or rimming variety, the following symbols shall be used to indicate the steel making practice: i) R - rimming steel, and ii) K = killed steel. NOTE -
If no symbol
is used, it shall mean
that the steel is of-semi-killed
type.
2) Steel quality - The following symbols shall be used to indicate steel quality: Q1 = non-ageing quality, Q2 p= freedom from flakes, Q3 - grain size controlled,. Q4= inclusion controlled, and Q5 = internal homogeneity guaranteed. *Code for designation of steels: Part I Based on letter symbols. *Classification of steels. JRules for rounding off numerical values (ret&i).
13
IS : 1570(Part
2/Set
1) - 1979
3) Degree of)wity-The sulphur and phosphorus analysis ) shall be expressed as follows: Symbol
levels ( ladle
Maximum Content in Percent _--___A-__---,
Phosphorus
Sulphur
P25 P35
0.025 0.035
0.025
P50
0.050
o-050
P70
o-070
0*070
0.055
0.055
No symbol will mean
0.035
The above symbols use the letter ’ P ’ followed by 1000 times the maximum percentage of sulphur and phosphorus, In case the maximum contents of sulphur and phosphorus are not -same, the following procedure shall be followed: Symbol SP shall be used to indicate the levels followed by: a) 100 times integer.
the
maximum
b) 100 times &e maximum integer.
sulphur rounded off * to the nearest
phosphorus rounded off * to the nearest
Example: = O-045 percent Maximum sulphur Maximum phosphorus = 0,035 percent Designation: SP 44. 4) Weldability guarantee - Guaranteed weldability of steel as determined .by tests mutually agreed between the supplier and the manufacturer shall be indicated by the following symbols: W = fusion weldable, and W1 = weldable by resistance welding but not fusion weldable. 5) Resistance to brittle fracture - Symbol * B ‘, ‘ BO ‘, ‘ B2 ’ or x B4 ’ indicating resistance to brittle fracture based on the results of the V-notch Charpy impact test, For steels B, ~BO, B2 and B4 a test should be made with Charpy V-notch specimens, taken in the direction of rolling with the notch perpendicular to the surface of the plate or product. *Rounding off shall be done according ,rounding off numerical values (revtied ).
to the rules
14
given
in 1s
: Z-1960Rules for
IS : 1570(Part 2/Set 1) - 1979 Steels B, BO, B2 and B4 are characterized by an average Charpy impact value according to the following table: Steels
V-notch
S’ecijied UTS Range -------------T r__________-_h_ 500 to 700 MPa* 370 to 520 MPa*
~~~~~~-_~~ Energy
r-W----_A--,~ Energy
Temperature
Temperature
(2)
(3)
(4)
(5)
J
“C
J
“C
B BO
28
27
40
27
28
0
28 40
-10
B2
28
-20
28 40
B4
28
-40
28 40
-30 -20 -50 -40
(1)
6) Surface condition - The following indicate surface condition: Sl = deseemed or scarfed;
symbols
0
shall be used to
S2 = descaled; s3 = pickled ( including washing and neutralizing S4 = shot, grit or sand blasted;
);
S5 = peeled ( skinned ); S6 = bright drawn or cold rolled; and S7 = ground. NOTE - If no symbol is used, it shall mean that the surface is in as-rolled or asforged condition. 7) Formability
( applicable to sheet only ) -
shall be used to indicate drawability:
The following
symbols
Dl = drawing quality, D2 = deep drawing quality, and D3 = extra deep drawing quality. NOTEquality. *lMPa
If no symbol
= lN/mmg
is used,
it shall
= 0,102 0 kgf/mm?
15
mean
that the steel is of commercial
IS : 1570(Part
2/Set 1) - 1979
The following shall be used to indicate the surface finish: Fl I general purpose finish,
8) Surface jnish ( upjdicable to sheet only) -
symbols
F2 = full finish, F3 = exposed, F4 = unexposed, F5 s matt finish, F6 F7 F8 F9 FlO
= =i = = = =
bright finish, plating finish, unpolished finish, polished finish, polished and coloured blue, polished and coloured yellow,
Fll F12 = mirror finish, F13 = vitreous enamel finish, and F14 = direct annealed finish.
9) Treatment-The following symbols shall the treatment given to the steel: Tl = shot-peened,
be used to indicate
T2
= hard-drawn, T3 = normalized*, T4 s controlled rolled, T5 = annealed,
T6 = patented, T7 = solution-treated, T8 I solution-treated T9 = controlled
and aged,
cooled,
TlO = bright annealed, T11 = spherodized, T 12 =is stress-relieved, T13 = case-hardened*, T14 s1 hardened NOTIC
*Includes
-
and
and tempered.
If no symbol is used, it means that the steel is hot-rolled.
tempering,
if done.
16
1s : 1570(Parf
2/Set
1)
- 1979
10) Elevated tem#erature properties - For guarantee with regard to elevated temperature properties, the letter ‘ H ’ shall be used. only the room temperature However, in the designation properties shall be shown. Elevated temperature properties shall be intimated to the purchaser separately by the manufacturer. 11) Cryogenic qualify- For guarantee with regard to low temperature properties, the letter ‘ L ’ shall he used. However, only the room temperature properties shall be indicated in the designation. Examples: 21C5BO
Semi-killed steel with average 0.25 percent carbon and 0.5 percent manganese content and resistance to brittle fracture grade BO.
45ClOW
Steel with average 0.45 percent carbon, 1 percent manganese and guaranteed fusion weldable.
17
IS : 1570(Part 2/Set 1) - 1979 ( Confind from -page2 ) Representing
MtTlbnS Snxu M. K. DUTTA
Steel
Authority of India Plant ), Durgapur
Ltd
( Durgapur
Steel
Snrtr R. C. JHA ( Alternate ) JOINT DIRECTOR (MET), MinistryofRailways RESEAROH DESIGNS & * STANDARDS ORQANIZATION ASSISTANT DIRECTOR ( MS ) ( Alternate ) Bhabha Atomic Research Centre, Trombay DR N. KONDAL Rno SHRI K. BALARAMAYOORTHY ( Alternate ) Bihar Alloy Steels Ltd, Ranchi DR N. MOHAN Allov Steels Producers Association of India, DH R. V. PATHY* Bombay Iron & Steel Control, Calcutta SI~RI M. K. PRAMANIE Heavy Engineering Corporation Ltd, Ranchi S~IRI R. C. PRASAII SI~RI D. K. DAS ( Alferaate) Association of Indian Automobile Manufacturers, Srin~ A. K. ROY Bombay Mahindra Ugine Steel Co Ltd, Khopoli SSllI A. R. V. SURRAMANIAN Bharat Heavy Electricals Ltd, Tiruchchirappalli DR G. VENKATARAMAN
*Dr B. V. Psthy 00 Ltd. Khopoll.
is also
alternate to Shrl A. R. V. Eubramanlanrepresecting &hi&a
18
Uglne Steel
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