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Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to

information for citizens to secure access to information under the control of public authorities,in order to promote transparency and accountability in the working of every public authority,

and whereas the attached publication of the Bureau of Indian Standards is of particular interest

to the public, particularly disadvantaged communities and those engaged in the pursuit of

education and knowledge, the attached public safety standard is made available to promote the

timely dissemination of this information in an accurate manner to the public.

! $ ' +-Satyanarayan Gangaram Pitroda

Invent a New India Using Knowledge

01 ' 5 Jawaharlal Nehru

Step Out From the Old to the New

1+, 1+Mazdoor Kisan Shakti Sangathan

The Right to Information, The Right to Live

! > 0 B BharthariNtiatakam

Knowledge is such a treasure which cannot be stolen

IS 1570-2-1 (1979): Schedules for Wrought Steels, Part 2:

Carbon Steels (Unalloyed Steels), Section 1: Wrought

Products (Other Than Wires) With Specified Chemical

Composition and Related Properties [MTD 16: Alloy Steels

and Forgings]

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IS : 1570 ( Part 21Sec 1 ) 1979( Reaffirmed 1998 )Indian Standard

SCHEDULES FORWROUGHT STEELSPART 2 CARBON STEELS ( UNALLOYED STEELS)

Section 1Wrought Products (OtherThan Wires)With SpecifiedChemical Composition and Related Properties

( First Revision)Fourth Reprint APRIL 2001( Incorporating Amendment No. I )

UDC 669.14 (083.4 )

co Copyright 1999BUREAU OF IND IAN STANDARDSMANAKBHAVAN, 9 BAHADURSHAll ZAFARMARG

NEW DELHI 110002GrS October )979

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IS : 1570(Part 2/Sec 1) 1878Indian Standard

SCHEDULES FOR WROUGHT STEELSPART 2 CARBON STEELS (UNALLOYED STEELS)Section 1 Wrought Products (Other Than Wires) With SpecifiedChemical Composition and Related Properties

( First Revision)Alloy Steels and Special Steels Sectional Committee, SMDC 19

ChairmanDn G. MUKHEl t JEE

RepresentingSteel Authority of India Ltd ( Alloy Steels Plant ))Durgapur

Directorate Gcnf'ral of Supplies & Disposals( Inspection Wing). New Delhi

National Test House, CalcuttaGuest, Keen, Williams Ltd, Howrah

Snnr R. C. JHA ( Alternate)SUH.1 S. D. GUPTA

MembersSHI t } A. N. BJSWAS

SUlC,I S. K. l lASU ( Alternate)SUl l I B. C. BISWASSun r A. M. nlSWAR (Alternate)SUI t t P. K. CHAKHAVAHTY The Tata Iron & Steel Co Ltd, JamshedpurD 1, T. M UK HEn . JBE ( Alternate)Snn r P. K. C H A T ' l ' I i ; H J I ~ J D Ministry of Defence (DGI )

SlUl I P. K. GANOOP.ADHYAY ( Alternate)SHIH K. M. CHAUDlLU l tY National Metallurgical Laboratory (CSIR),

JatnahedpurSJ lR } DASARA' l 'HA The Visvcsvaraya Iron & Steel Ltd, BhadravatiSn n r B. C. DASAVARAJ ( Alternate )SURI S. V. DATAR Ahmedabad Advance Mills Ltd, Navsari

SURf M. K. ( ;UOSJI ( Alternate)SUIt I A. D. DIA8 The Indian Tool Manufacturers Ltd, BombaySHRI M. K. DATTA Steel Authority of Ind ia Ltd ( AHoy Steels Plant ),Durgapur

Srm r P. K. G Y N ) ~ ( Alternate)jO IN ' DIH ,EcTon (MET) . RI;SEARCll Ministry of Railways

DESIGNS AND S TAN D A.R D 8OROANIZ-\TIOND ~ P U 1 ' Y Dnux ron ( MET-II.>,R1)50 ( Alternate)

( Continued onpage 2 ) Copyright 1979

BUREAU OF INDIAN STANDARDSThis public arion I I proter te-d under the Indian Copyright .4ct (XIV of 1957) andreproduction in whole or in part by any means except with written permission of thepublisher .hall be deemed to be an infringement of copy right under the said Act.

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IS : 1570(part 2/SeC 1) 1978

Director General, lSI (E,xofficio MnnlHr)

Mahindra Ugine Steel Co Ltd, Bombay; and AlloySteel Producers' Association of India, BombaySHRt R. NARAYANA (Allmlal') Mahindra Ugine Steel Co Ltd, Bombay

SaB I M. K. P.RAJIANIX Iron &. Steel Control, CalcuttaSaR I S. S. SABA ( Allml4t. )DB V. RA.IIA8WAIIY

Directorate General of Technical Development,New DelhiSBal M. K.. BANmlJIIB (..4l"""")Ssal A. PADIIAHABBAJI Amok Leyland Ltd, Madras8&B11. M. P.6.1 Firth India Steel Co Ltd, ThaneSHBI B. M. PAl (Alln1ltJl, )DJI R. V. PATRY

Research & Development Centre for Iron andSteel ( HSL ), RanchiSHRt S. R. MJr.DIBATTA (AlI.,.,u",)SaRI M. RANOA,aAI Hindustan Machine Tools Ltd) BangaloreSRBI SANl IT SO' (AI,.,,..,. I )SHRt P. RAMA PBASA.D (AU",..,. I I )

SHBI A. K. Roy The Tata Engineering and Locomotive Co Ltd,jamsbedpur

(CMlitfllMlft.". /NIl' 1 )MlmlJns /Uprtsmling

SaBI S. R. KBAJlII Indian Register of Shipping, BombaySRBI V. N. PAKDAY ( Al'''''''' )S.BI R.. S. KOTKAWALB Bbarat Forge Co Ltd, Mundhwa, PuneSBBI S. S. LAKK17.MDI ( ~ " ' U l I )D . D. P. I"AJUBI Ministry of Defence (R &. D )SRBI I. N. BB4TIA ( MllrMt,)Saal K. N. M... . . . Heavy Engineering Corporation Ltd, RanchiS K B I D . K . D A . ( ~ m M u )Saal L. Mlasa.

DR S. K. MOlfDAL ( Al,,,,..',)SHBI D. SI1.INIVA8AN Steel Furnace Association of India, CalcuttaDRS. K. CBATTEBID (AI '"""u)SSBI Y. C. SUBRABIIANYA Ministry of Defence ( OGOF)Saal K. S. VA1DYANATHAlf M. N. Dastur &. Co Pvt Ltd, CalcuttaSHBI C.J. DAVB ( ~ l t " " " h )S.aJ C. R. RAJfA RAO,Director ( Struc &.Met) &""'"S aB I VIIAY KUIIAnAuistant Director ( Metall), lSISubcommittee for the Revision of Schedule for Wrought Steel forGeneral Engineering Purposes, SMDC 19: 5

Clift,...S a a I P .K .C sAKa . vA8TY

M",,6w,SBBI S. K. BABUSRBI P. K. CRATTBBIBB

SJ:lJU M. K. SBN (&,,,'"'u )

The"Tata Iron &. Steel Co Ltd, JamahedpurGUelt, Keen, Williams Ltd, HowrahMinistry of Defence ( DGI )

( ContilUMd t i l l 14" 18)2

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IS : 1570(Part 2/Sec 1) .1979

Association of Indian Automobile Manufacturers,BombayMahindra Uginc Steel Co Ltd, KhopoliBharat Heavy Electricals Ltd, Tiruchchirappalli

RefwtstntingSteel Authority of India Ltd (Durgapur SteelPlant ), Durgapur

Su nr A. R. V. SUnnA l \ fAN IANDn G. V" ;NKATARA ' tAN

SUR I M. K. PRAMANJKSUIU R. C. PRASADSlInI D. K. DAS (Allernate)Srmr A. K. Roy

( CtmIia,d from /M" 2 )Mem6lrs

Srmr M. K. DUTTASURI R. C. JElA ( Altn-nat,)

JOINT D I R E O T O R (MET) , Ministry of RailwaysRESBAROH DESIGNS & STANDARDS ORGANIZAT ION

ASSJ8TANT DnlECTOR ( MS) ( Alternate)DB N. KONDAL RAO Bhabha Atomic Research Centre, TrombaySnur K. BALARAMAMOOUTHY (Alternate)DR N. MOHAN Bihar Alloy Steels Ltd , Ranch iDR R. V. PATRY. Alloy Steels Producers Association of India,BombayIron & Steel Control, CalcuttaHeavy Engineering Corporation Ltd, Ranchi

-D r B. V. Path, I. also a lt er na te to Sbrl A.. R. V. 8ubrtlmanlQ.D repreaectlol Mahln1ra U,lnt 8teelCo Ltd. Khopoll.

38

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IS : 117O(P.rt 2/Sec 1) 1878Indian Standard

SCHEDULES FOR WROUGHT STEELSPART 2 CARBON STEELS (UNALLOYED STEELS)SectlCln1 Wrought Products ( Other Than Wires) With SpecifiedChemical Composition and Related Properties

( First Revision)o. FOREWORD

0.1 This Indian Standard (Part I I ) (First Revision) was adopted bythe Indian Standards Institution on 5 March 1979, after the draft finalized by the Alloy Steels and Special Steels Sectional Committee had beenapproved by the Structural and Metals Divisiorr Council.0.2 Schedules for wrought steels for general engineering purposes ( IS :1570-1961 ) was first published in 1961. On the basis of the experiencegained in the production and use of steels, the Sectional Committee hasdecided to revise the standard and issue it in parts. The other parts ofthe standard are as follows:

Part I Steels specified by tensile and/or yield propertiesPart III Carbon and carbon manganese free cutting steelsPart 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 withIS : 1762 (Part I )-1974t. However, for the sake of easyidentification old designations are also given within brackets.b) New grades 2C2, 50CS, 60C6 have been added.c) Manganese content of grades C05 ( 5C4), C55 ( 55C4), andC60 ( 6004 ) have been modified.d) Mechanical properties for cold-drawn bars given in Table 3 havebeen 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

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IS : 1570(Part 2/Sec 1) -19790.4 This schedule does not give limits for sulphur and phosphorus. Thesehave to be specified in the detailed specifications. The standard rangesfor sulphur and phosphorus and the method for designating steel accordingto its sulphur and phosphorus content, steel making practice and methodof deoxidation is detailed in Appendix' A ' for information.0.5 For the purpose of deciding whether a particular requirement of thisstandard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS : 2-1960*. The number of significant places retained in the roundedoff value should be the same as that of the specified value in thisstandard.

1. SCOPE1.1 This schedule ( Part II ) is applicable to standards for carbon steelswhen it is necessary for the steel to be supplied to a composition withinreasonably defined limits. This schedule is not intended to be used as astandard.1.1.1 This schedule may be used for ordering steels provided no detailedspecification is available for the particular steel.

2. GENERAL2.1 While preparing Indian Standards, or revising existing standards,steels listed in this schedule shall be selected. The specification of mechan ica l proper ties different frem those given in this schedule should notbe made unless special conditions of service render this essential. In thatevent, full reasons for the proposed departure from the steels specified inthis schedule shall be submit ted to the Alloy Steels and Special SteelsSectional Committee, SMDC 19, and its approval obtained.2.2 In addition to specified mechanical properties, ranges for carbon andmanganese are, laid down in the schedule ( see Table 1 ), but as in manycases, the steels of lower carbon content are required as rimming, semikilled 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,etc, should be included in the standard. Since different levels of sulphurand phosphorus are required according to the severity of the conditionsin service, limits for these elements are also not inc luded in the schedulebut should be specified in a specification at levels appropriate to themethod of steel production, conditions of service, etc.

-Rules for rounding off numerical values (revised).4

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IS : 1570(Part 2/Sec 1) -1979T A B L E 1 SPECIFIED CARBON AND MANGANESE LIMITSFOR THE STANDA.RD STEELS

( Claus, 2.2 )STEEL D28IONATIOK C Mn REFERENCE TO[se, IS : 1762 ( P A B T I )-1974] PBBOBNT PERCENT R E L E V A N T, .--_ _ _ _A.-.____ ~ INDIAN STANDARDNew O ld(1) {2} (3) (4) (5)2C2 (- ) 0'05 ANIt 0-40 MtU4C2 (C04 ) 0'08 Malt 0'40 MIlIt5C4 (COS) 0'10 Max O'SOMa IS : 4882, 43977C4 (C07 ) 0'12 Max 0'50 MiaIOC4 (CIO) 0'15 Max 0-300'60 IS : 1812, 2879, 443214C6 (C14 ) 0'10-0'18 0'40-0'70 IS : 1875, 2004, 4432,

5489ISd4 (CIS) 0 '20 Max 0'30-0'60 IS: 1812ISC8 ( C I 5 M n 7 ~ ) 0'10-0'20 0'600'90 IS : 2100, 6967, 1875,2004,443220C8 (C20 ) 0'15-0'25 0'60-0'90 IS : 1875, 200425C4- (C25 ) 0'20-0'30 0'30-0'6025C8 (C25Mn75 ) 0'20-0'30 0'60-0'90 IS : 1875, 200t, 3930,5517,696730CS (C30 ) 0'25-0'35 0'60-0'90 IS : 1875, 2004, 3930,5517, 69673SC4 ( C35) 0'30-0'W 0'30-0'6035C8 (C35Mn75 ) 0'30-0'40 0'60-0'90 IS : 1375, 2004, 3930,551740C8 (C40 ) 0'35-0'45 0'60-0'90 IS : 5517, 7226, 728345('8 (C45 ) 0'40-0'50 0'60-0'90 IS : 1875, 200-1-) 2:07,3930, 3261,551750C4 (C50 ) 0'45-0'55 0-300'60SOC8 ( -) O ' 4 5 . ~ 5 5 0'60-0-90 15:551750C12 (C50Mnl) 0'450'65 1'101-4055C4 (C55 ) 0'500'60 0300'60 IS : 2507, 3885, 3Q307226, 8054, 805553C8 ( C 5 5 M n 7 ~ J 0'50060 0'60-0'90 IS: 1875, 3445, 5511,749460C4 ( eGO) 0'55-0'65 0'300'6060C6 (- ) 0'55-0'65 0' 50-0'aO65C6 (C65 ) 0'60-0'70 0'50-0'80 IS: 1875,2004,2507 ..407270C6 (C70 ) 0'65-0'75 0'500'80 IS : 2507, 4072, 722675C6 (C75 ) 0'70-0'80 0'500'80 IS : 2507, 388580C6 ( CSO) 0'75-0'SS 0'500'80 IS : 2507, 407285C6 (C85 ) 0'800'90 O ' ~ 0 O ' 8 0 IS : 2507, 722698C6 ( e 9 8 ) 0'90105 0'50-0'80 IS: 2507, 3 1 ~ J ~ , 7 2 ~ 6113C6 (C113 ) 1'051'20 0'500'80 IS: 3195

S

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IS : 1570(P8rt 2/Sttc 1) 18782.! This schedule includes specified tensile properties applicable to thedifferent conditions, for example, Table 2 gives values for the hot-rolled ornormalized conditions. These values are based on ruling sections up to150 rom and for larger size. lome adjustment of the specified tensile rangefor 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 fOT hardened and temperedbars and forgings, together with the s i z e l ~ to which these properties areapplicable are given in Tables 3 and 4. Table 5 gi\les -the properties forcase-hardening steels, that is, the properties obtainable in the core of casehardened parts after refining and quenching. Some of the steels are usedin the form of sheet and strip and tubes and the tensile properties of theseare given in Tables 6, 7 and 8. For some purposes, a minimum yieldstress is regarded as specification requirement and minimum yield stressvalues are, therefore, given for some of the physical conditions for inclusionin specifications, if required. Information on the assessment of the rulingsection of bars, forgings and parts is given in Tables 9 and 10.2.4 In addition, values for the specified minimum percentage elongationcorresponding to the specified tensile ranges are included. Different typesof test pieces are used for the tensile test depending on the form of thematerial; for example, flat test pieces for thin plates, sections and flat bars;unmachined round test pieces for small size round bars; and machinedround test pieces for thicker plates, for larger size round bars and for squarebars, and forgings, Since the percentage elongation depends on the relationbetween the gauge length and the cross-sectional area of the test piece,specified minimum values for the percentage elongation for the differenttypes of test pieces are included in the schedule. These elongation valuesgiven are based on a gauge length of S65vAwhich is now internationally accepted. If test pieces of other than So65v'Agauge length areused. elongation conversion may be obtained from IS : 3803-1974.2.5 For tensile tests on tubes, the specified percentage elongation shouldbe' based on the recently adopted formulae of either 950 divided by theactual tensile strength in kgf Imml when using a gauge length equivalentto 5-65v'I o r of 1 100 divided by the actual tensile strength in kgf Immlwhen using a gauge length equivalent to 4v'.A.2.6 The notch toughness of steels after hardening and tempering is sometimes assessed by an impact test and values for incorporation in specifications; if required, are given in the relevant tables of the schedule

Method Cor elongation conversions for steel (firsl ,1O;sioll. ).6

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.9 : 1570(Part 2/Sec 1) -1878

TABLE 1 SPECIFIED TENSILE LIMITS FOR PLATES, SECTIONS, BARS,BILLETS AND FORGINGS IN THE HOT-ROLLED OR NORMAUZEDCONDITION( Clause 2.3)

I) 1';S10NAT ION' TENSILE ELONOATION PERCENT, Minr - - - - - - , J . . . - - - - - ~ STBJDNOTHNew Old(1) (2) (3) (4)

MPa7C4 (C07 ) 320-400 2710C4 (CIO) 340-420 2614C6 ( C.14) 370-450 2615C4 ( CI5 ) 370490 2515C8 (ClSMnZ2 ) 420-500 2520C8 (C20 ) 440-520 2425C4 (C25 ) 440-540 2325C8 (C25Mn75 ) 470-570 2230C8 (e30 ) 500600 2135C4 ( C ~ 5 ) 520-620 2035C8 ( C 3 5 M n ~ ) 550650 20.weB (C40 ) 580680 1845C8 (C45 ) 630-710 1550C4 (C50 ) 660-780 1350C13 (C50Mnl) 720 Min 1155C8 (C55Mn75 ) 720 Min 136OC4 (eGO) 750 Min 1165C6 (C65 ) 750 Min 10

NOTE - Minimum values for th e yield stress may be required in certain specifications and in such cases, a minimum yield stress of 55 percent of the minimumtensile strength should be satisfactory.*IMPa = IN/roml c:= 01020 kgf/mm l .

2.7 The specified mechanical properties are applicable to test samplestaken from a standard location which I should be included in thespecification.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 thestandard as appropriate.

7

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DG

O

r

A

-~

Nw

Od

TA3S

EDTNLLMTFOCDDWNB

[CwSO3da3

UO2m

OVER2m

OVER4m

r

A.

UO4m

UO6m

TeEoor

A.

~r

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SehPcMTeEooTeEoo

Ma

SehPcMnSehPcMn

Mn

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.& e ~ o -a ~

OVER6om

3

r-----..A.---~

.&

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SehPcMn.&

Mn

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(1

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MP

MP

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4

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*MP==INm=01

m

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IS : 1570(Part 2/Sec 1) 1979TABLE .. SPECIFIED MECHANICAL PROPERTIES FOR BARS ANDFORGINGS IN THE HARDENED AND TEMPERED CONDITION

( Claus, 2.3 )DESIGNATION TENSILE YIELD EI.ON'OATION, IZOD LIMITING

r - - - - - - - . A . - - - ~ ST l lENOTH STRESS PEI tCENT, IMPACT RUI. INONew Old Mill Min VALUE, SECTION(II ' SPEOIFIED) Min

( I " S P E O I ~ I E D )(1) (2) (3) (4) (5) (6) (7)

MPa MPa- Joules mmSOC8 (C30 ) 600-750 400 18 55 3035C8 ( C35Mn75) 600-750 400 18 55 6340CB (C40 ) {600-750 380 18 41 100700850 480 17 35 3045C8 (C45 ) {600-750 380 17 41 100700-850 480 15 35 3050C4 (CSO) r OO-85O 460 15 63800-950 540 13 3055C8 (C55Mn75 ) rOO-850 460 15 63800-950 540 13 30*lMPa == IN/mm l .. 01020 kgf/mm l _

TABLE 5 SPECIFIED MECHANICAL PROPERTIES FOR CASE-HARDENINGSTEELS IN THE REFINED AND Q.UENCHED CONDITION( CORE PROPERTIES)( Clause 2.3 )

DESIGNATION TEr-tSILE ELONGATION', IZOD IMPAOT LIMITINGr - - - - - . A - - - - ~ STRENGTH, PERCENT, MIn VALUE, Min RULINGNew OJd u. ( IF SPECIFIBD) S ~ ( ' T I 0 N

(1) (2) (3) (4) (5) (6)MPa Joules mrn

10C4 (CIO) 500 17 55 1514C6 (C14 ) 500 17 55 Over 15Up to 3015C8 (C15Mn75 ) 500 17 55 30zoca ( C20 ) 500 16 55 30*IMPa == IN/mm l == 0-102 0 kgf/mm l

9

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IS : 1570(P.rt 2/Sec 1) .1870TABLE' SPEClnED TENSILE LIMITS FOR MILD STEEL SHEET ANDSTRIP IN THE COLD-ROLLED AND ANNEALED CONDITION

( Claru, 2.3 )DESIGNATION

r - - - - . A . . - - - - ~New OldTENSt l..E

STRF:NOTllMinELONOATJON, PERCENT,Min, "'rEST PIECE,

WIDTH 12-5 mm,GAUG. LBNGTH50mm

(I)

7C4lOC415C420C8

(2)(C07 )(CIO)(C15 )(C20 )

(3)MPa

300-380320-400320-440390..510

(4)

28282525

.1MPa lI D IN/mmS == 0-1020 kgf/mm l

TABLE 7 SPEClnED TENSILE LIMITS FOR MILD STEEL SHEET ANDSTRIP IN THE COLD-ROLLED CONDITION(Clawe 2_3)

DESIGNATIONr - - - - .A . . - - - -,New OldCONDITION TENSILE

STRENO', fH

(1)

15C4

(2)

(CIS)

(3)

( ~ l a r t e r hardHalf hardLHard

(4)MPagOO-470470-570570 Milt

.1MPa -= IN/mm l = 0-1020 kgf/mml

10

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IS : 1570(Part 2/Sec 1) 1979

ELONGATIONPEl tCENT,

Mi"

TABLE 8 SPECIPIED TENSILE LIMITS FOR TUBES IN THECOLDDRAWN AND ANNEALED CONDITION AND IN THE COLDDRAWNOR COLD-DRAWN AND TEMPERED CONDITION( Claus, 2.3 )

COLD-DRAWN COLD-DRAWN ORAND ANNEALED COLD -DRAWN, - - - _ .A . -__ ~ AND TEMPEREDTensile Yield r---- . .A.--- ,Strpngth, Stress, Tenaile YieldMin Min Strength, S t r ~ 9 S ,Min Min

DESIGNATION,---..A---,New Old

(1) (2 ) (3) (4) (5) (6 ) (7)MPa MPa MPa MPa14C6 (C14 ) IJ5Cj. (CI5) j 320 J70 440 38 95015C8 (C15Mn75 ) -1;g on gauge length20C8 (C20 ) - 370 220 520 42 = 5 ( j 5 ~ A25C4 (C25) }

2 S < ' ~ 8 ( C 2 5 M n 7 ~ ) 390 250 S

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IS : 1570(Part 2/Sec 1) 1979TABLE 10 CONVERSION OF RECTANGULAR AND SQUARE SECTIONSINTO EQ.UIVALENT RUUNG SECTIONS, AIR COOLING

( Claus 2.3)WIDTH OJ' TIIICKNE88 OF SECTIONSECTJON

~ ______________ A ______________ ~10 20 30 40 50 60 80 100 120 140mm mm mm mm mm mm mm mm mm mm

DIAMETER OJ ' EQUIVALENT ROUND8(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)mm mm mm m ..n mm mm mm mm mm mm mm

10 1020 13 2030 15 24 3040 16 27 34- 4Q50 16 29 38 45 5160 17 30 41 49 55 6180 17 32 45 54- 62 70 81100 17 33 47 58 68 76 90 102120 17 34 49 62 72 82 98 111 122140 17 34- 50 64- 76 86 104- 119 132 142160 17 34 51 66 79 90 109 126 140 152180 18 35 51 67 81 93 114 132 148 x200 18 35 52 68 83 95 117 137 154 X225 18 35 52 69 85 98 121 142 X X250 18 36 53 70 86 100 125 147 X X300 18 37 54 71 88 104- 131 155 X x350 and over 20 39 59 78 97 115 152 X X XX Greater than 160 rom.

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IS : 1570(Part 2/Sec 1) 1979A PPENDIX A

( Clause 0.4 )NEW SYSTEM OF DESIGNATION OF STEELS

A-I. GENERALA-I.I The new system of designation of steel is based on the draft ISOproposal submitted by India to I S O / 1 ~ C 17 ' Steel ' for formulation of aninternational standard. Details of the new designation system are givenin IS: 1762 (Part 1)-1974.A..2. STEELS DESIGNATED ON THE BASIS OF CHEMICALCOMPOSITIONA-2.1 Unalloyed Steels (a s Defined in IS: 7598-197ft ) - The codedesignation shall consist of the following in the order given:

a) Figure indicating 100 times the average percentage of carboncontent,b) Letter ' C', andc) Figure indicating 10 times the average percentage of manganesecontent. The figure after multiplying shall be rounded otT to thenearest integer according to the rules given in IS : 2-1960j.d) If necessary, symbols indicating special characteristics as follows:

1) Method of designation - Depending on whether the steel iskilled, semi-killed or rimming variety, the following symbolsshall be used to indicate the steel making practice:i) R -= rimming steel, and

ii) K = killed steel.NOTE - Ifno symbol is used, it shall mean that th e steel is of semi-killed type.

2) Steel quality - The following symbols shall be used to indicatesteel quality:Ql = non-ageing quality,Q2 === freedom from flakes,Q3 == grain size controlled,Q4 = inclusion controlled, andQ5 = internal homogeneity guaranteed.

Code for designation of steels: Part I Based on letter sy rnbols.tClassification of steels.tRules for rounding off numerical va lur-s (rtl'is,d).13

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IS : 1570(P8rt 2/Sec 1) 19783) Degree of purity - The sulphur and phosphorus levels ( ladleanalysis) shall be expressed as follows:

Symbol Maximum Contenl in Percent,----------"'--Phosphorus SulphurP25 0025 0025P35 0-035 0-035P50 0'050 0'050P70 0'070 0'070No symbol will mean 0-055 0055

The above symbols use the letter f P , followed by 1 000 times themaximum percentage of sulphur and phosphorus. In case the maximumcontents of sulphur and phosphorus are not same, the following procedureshall be followed:

Symbol SP shall be used to indicate the levels followed by:a) 100 times the maximum sulphur rounded off to the nearestinteger.b) 100 times the maximum phosphorus rounded off to the nearestinteger.Example:

Maximum sulphur -= 0'045 percentMaximum phosphorus - 0'035 percentDesignation: SP 44.

4) Weldability guarant - Guaranteed weldability of steel as determined .by tests mutually agreed between the supplier and themanufacturer shal l be indicated by the following symbols:W = fusion weldable, andWI -= weldable by resistance welding but not fusion weldable.

5) Resistance to brittle fracture - Symbol' B " CBO " ' B2 ' or 'B4 tindicating resistance to brittle fracture based on the results ofthe V-notch Charpy impact test.

For steels B, BO, B2 and B4 a test should be made with CharpyV-notch specimens, taken in the direction of rolling with the notchperpendicular to the surface of the plate or product.*Rounding off sha ll be done according to the rule. given in IS : 21960 Rules rorrounding off numerical value. ( "ois,d ).

14

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IS: 1570(Part 2/Sec 1) -1979Steels B, BO,B2 and B4 are characterized 'by an average V-notchCharpy impact value according to the following table:

Steels SpecifiedUTS Ranger------------- . ; - - - - - - - - - - - - - - ~370 to 520 MPa 500 to 700 MPar - - - - - - . A . - - - ~ r - - - - - " - -Energy Tempe- Energy Tempe-rature rature

(1) (2) (3) (4) (5)J C J C

B 28 27 40 27BO 28 0 28 -1 0

40 0B2 28 -2 0 28 -3 040 -2 0Bil 28 -4 0 28 -5 040 -4 06) Surface co"dition - The following symbols shall be used toindicate surface condition:

S1 = deseemcd or scarfed;S2 = descaled;S3 == pickled ( including washing and neutralizing );S4 = shot, grit or sand blasted;S5 = peeled ( skinned );S6 = bright drawn or cold rolled; andS7 .. . ground.

NOT1 ' l - I f no symbol is used, it ahal l mean that the surface is in aa-rolled or asforged condition,7) Formability (applicable to sheet only) - The following symbolsshall be used to indicate drawabiJity:

Dl - drawing quality,D2 = deep drawing quality, andD3 = extra deep drawing quality.

NOTF.: - I f no symbol is used, it shall mean that the steel is of commercialqualit}" IMPa - IN/mml = 0'1020 kgf /mm l ,

IS

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IS : 1570(Part 2/Sec 1) 19798) Surface finish ( applicable to sheetonly) - The following symbolsshall be used to indicate the surface finish:

Fl = general purpose finish,F2 = full finish,F3 - exposed,F4 = unexposed,F5 = matt finish,1"6 = bright finish,F7 = plating finish,FB = unpolished finish,F9 = polished finish,

FlO = : : polished and coloured blue,:F11 = polished and col oured yellow,F 12 = mirror finish)F 13 = vitreous enamel finish, and

14 = direct annealed finish.9) Treatment - The following symbols sha ll be used to indicatethe treatment given to the steel:

T'I = shot-peened,T2 -=== hard-drawn,T3 == .norrnalizcd'",T4 = controlled rolled,T5 == annealed,T6 = patented,T7 = solution-treated,T8 = solution-treated and aged,T9 = controlled cooled,

TiO = bright annealed,TIl === spherodized,T 12 -=a stress-relieved,T13 = case-hardened", andT14 == hardened and tempered.

NOTE - If no symbol is used, i t means that the steel is hot-rolled.

-Includes t ernpcring , i f done.

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IS : 1570(Parf 2/Sec 1) - 197910) Eleuated temperature properties - For guaran tee with regard toelevated temperature properties, the letter CH' shal l be used.

However, in the designation only the room temperatureproperties shall be shown. Elevated temperature propertiesshall be intimated to the purchaser separately by the manufacturer.

Semi-killed steel with average 025 percent carbonand 05 percent manganese content and resistance tobrittle fracture grade no.Steel with average 045 percent carbon, 1 percentmanganese and guaranteed fusion weldable.45CIO"V

11) Cryogenic qualily- For guarante-e with regard to low temperatureproperties, the letter C L ' shall he used. However. only theroom temperature properties shall be indicated in the designation.Examples:

2lC5BO

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