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है”ह”ह

IS 1570-2-1 (1979): Schedules for Wrought Steels, Part 2:Carbon Steels (Unalloyed Steels), Section 1: WroughtProducts (Other Than Wires) With Specified ChemicalComposition and Related Properties [MTD 16: Alloy Steelsand Forgings]

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

Indian Standard

SCHEDULES FOR WROUGHT STEELS

PART 2 CARBON STEELS ( UNALLOYED STEELS)

Section 1 Wrought Products (OtherThan Wires) With Specified

Chemical Composition and Related Properties

( First Revision)

Fourth Reprint APRIL 2001( Incorporating Amendment No. I )

UDC 669.14 (083.4 )

co Copyright 1999

BUREAU OF INDIAN STANDARDSMANAKBHAVAN, 9 BAHADURSHAll ZAFARMARG

NEW DELHI 110002

GrS October )979

IS : 1570(Part 2/Sec 1) ·1878

Indian 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. MUKHEltJEE

RepresentingSteel Authority of India Ltd ( Alloy Steels Plant ))

Durgapur

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

National Test House, Calcutta

Guest, Keen, Williams Ltd, Howrah

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

MembersSHIt} A. N. BJSWAS

SUlC,I S. K. llASU ( Alternate)SUllI B. C. BISWAS

Sun r A. M. nlSWAR (Alternate)SUItt P. K. CHAKHAVAHTY The Tata Iron & Steel Co Ltd, Jamshedpur

D 1«, T. M UK HEn.J BE ( Alternate)Snnr P. K. CHAT'l'Ii;HJI~JD Ministry of Defence (DGI )

SlUlI P. K. GANOOP.ADHYAY ( Alternate)SHIH K. M. CHAUDlLUltY National Metallurgical Laboratory (CSIR),

JatnahedpurSJlR} DASARA'l'HA The Visvcsvaraya Iron & Steel Ltd, Bhadravati

Snn r B. C. DASAVARAJ ( Alternate )SURI S. V. DATAR Ahmedabad Advance Mills Ltd, Navsari

SURf M. K. (;UOSJI ( Alternate)SUItI A. D. DIA8 The Indian Tool Manufacturers Ltd, BombaySHRI M. K. DATTA Steel Authority of India Ltd ( AHoy Steels Plant ),

Durgapur

Srm r P. K. GYN)~ ( Alternate)jOIN'£ DIH,EcTon (MET). RI;SEARCll Ministry of Railways

DESIGNS AND S TAN D A. R D 8OROANIZ-\TIOND~PU1'YDnux ron ( MET-II.>,

R 1)50 ( Alternate)

( Continued onpage 2 )

® Copyright 1979

BUREAU OF INDIAN STANDARDS

This public arion II prot erte-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.

IS : 1570(part 2/SeC 1) ·1978

Director General, lSI (E,x·officio MnnlHr)

Mahindra Ugine Steel Co Ltd, Bombay; and AlloySteel Producers' Association of India, Bombay

SHRt R. NARAYANA (Allmlal') Mahindra Ugine Steel Co Ltd, BombaySaBI M. K. P.RAJIANIX Iron &. Steel Control, Calcutta

SaRI S. S. SABA ( Allml4t. )DB V. RA.IIA8WAIIY

Directorate General of Technical Development,New Delhi

SBal M. K.. BANmlJIIB (..4l"""")Ssal A. PADIIAHABBAJI Amok Leyland Ltd, Madras8&B11. M. P.6.1 Firth India Steel Co Ltd, Thane

SHBI B. M. PAl (Alln1ltJl, )DJI R. V. PATRY

Research & Development Centre for Iron andSteel ( HSL ), Ranchi

SHRt S. R. MJr.DIBATTA (AlI.,.,u",)SaRI M. RANOA,aAI Hindustan Machine Tools Ltd) Bangalore

SRBI SANlIT SO' (AI,.,,..,. I )SHRt P. RAMA PBASA.D (AU",..,. II )

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

( CMlitfllMlft.". /NIl' 1 )

MlmlJns /UprtsmlingSaBI S. R. KBAJlII Indian Register of Shipping, Bombay

SRBI V. N. PAKDAY ( Al'''''''' )S.BI R.. S. KOTKAWALB Bbarat Forge Co Ltd, Mundhwa, Pune

SBBI S. S. LAKK17.MDI (~"'UlI)D. D. P. I"AJUBI Ministry of Defence (R &. D )

SRBI I. N. BB4TIA ( MllrMt,)Saal K. N. M...... Heavy Engineering Corporation Ltd, Ranchi

SKBID.K.DA.(~mMu)Saal L. Mlasa.

DR S. K. MOlfDAL ( Al,,,,..',)SHBI D. SI1.INIVA8AN Steel Furnace Association of India, Calcutta

DR S. K. CBATTEBID (AI'"""u)SSBI Y. C. SUBRABIIANYA Ministry of Defence ( OGOF)Saal K. S. VA1DYANATHAlf M. N. Dastur &. Co Pvt Ltd, Calcutta

SHBI C.J. DAVB ( ~lt"""h)S.aJ C. R. RAJfA RAO,

Director ( Struc &. Met)

&""'"SaBI VIIAY KUIIAn

Auistant Director ( Metall), lSI

Subcommittee for the Revision of Schedule for Wrought Steel forGeneral Engineering Purposes, SMDC 19 : 5

Clift,...SaaIP.K.CsAKa.vA8TY

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

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

The"Tata Iron &. Steel Co Ltd, Jamahedpur

GUelt, Keen, Williams Ltd, HowrahMinistry of Defence ( DGI )

( ContilUMd till 14" 18)

2

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

Association of Indian Automobile Manufacturers,Bombay

Mahindra Uginc Steel Co Ltd, KhopoliBharat Heavy Electricals Ltd, Tiruchchirappalli

Refwtstnting

Steel Authority of India Ltd (Durgapur SteelPlant ), Durgapur

Su nr A. R. V. SUnnAl\fANIAN

Dn G. V";NKATARA'tAN

SURI M. K. PRAMANJK

SUIU R. C. PRASAD

SlInI D. K. DAS (Allernate)Srmr A. K. Roy

( CtmIia,d from /M" 2 )

Mem6lrsSrmr M. K. DUTTA

SURI R. C. JElA ( Altn-nat,)JOINT DIREOTOR (MET), Ministry of Railways

RESBAROH DESIGNS & •STANDARDS ORGANIZATION

ASSJ8TANT DnlECTOR ( MS) ( Alternate)DB N. KONDAL RAO Bhabha Atomic Research Centre, Trombay

Snur K. BALARAMAMOOUTHY (Alternate)DR N. MOHAN Bihar Alloy Steels Ltd, RanchiDR R. V. PATRY. Alloy Steels Producers Association of India,

BombayIron & Steel Control, CalcuttaHeavy Engineering Corporation Ltd, Ranchi

-Dr B. V. Path, I. also alternate to Sbrl A.. R. V. 8ubrtlmanlQ.D repreaectlol Mahln1ra U,lnt 8teelCo Ltd. Khopoll.

38

IS : 117O(P.rt 2/Sec 1) ·1878

Indian Standard

SCHEDULES FOR WROUGHT STEELS

PART 2 CARBON STEELS (UNALLOYED STEELS)

SectlCln 1 Wrought Products ( Other Than Wires) With SpecifiedChemical Composition and Related Properties

( First Revision)o. FOREWORD

0.1 This Indian Standard (Part II) (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 with

IS: 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), and

C60 ( 6004 ) 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

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

0.4 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. SCOPE

1.1 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. GENERAL

2.1 While preparing Indian Standards, or revising existing standards,steels listed in this schedule shall be selected. The specification of mecha­nical properties 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 submitted 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 included 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

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

TABLE 1 SPECIFIED CARBON AND MANGANESE LIMITSFOR THE STANDA.RD STEELS

( Claus, 2.2 )STEEL D28IONATIOK C Mn REFERENCE TO

[se, IS : 1762 ( PABT I )-1974] PBBOBNT PERCENT RELEVANT,.--____A.-.____~INDIAN STANDARD

New Old(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 Mia

IOC4 (CIO) 0'15 Max 0-30·0'60 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 ( CI5Mn7~) 0'10-0'20 0'60·0'90 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, 6967

3SC4 ( C35) 0'30-0'W 0'30-0'6035C8 (C35Mn75 ) 0'30-0'40 0'60-0'90 IS : 1375, 2004, 3930,

5517

40C8 (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, 3261,5517

50C4 (C50 ) 0'45-0'55 0-30·0'60SOC8 ( -) O'45.~55 0'60-0-90 15:5517

50C12 (C50Mnl) 0'45·0'65 1'10·1-4055C4 (C55 ) 0'50·0'60 0·30·0'60 IS : 2507, 3885, 3Q30

7226, 8054, 8055

53C8 ( C55Mn7~J 0'50·0·60 0'60-0'90 IS: 1875, 3445, 5511,7494

60C4 ( eGO) 0'55-0'65 0'30·0'6060C6 (- ) 0'55-0'65 0' 50-0'aO

65C6 (C65 ) 0'60-0'70 0'50-0'80 IS: 1875,2004,2507 ..4072

70C6 (C70 ) 0'65-0'75 0'50·0'80 IS: 2507, 4072, 7226

75C6 (C75 ) 0'70-0'80 0'50·0'80 IS : 2507, 3885

80C6 ( CSO) 0'75-0'SS 0'50·0'80 IS : 2507, 4072

85C6 (C85 ) 0'80·0'90 O'~0·O'80 IS : 2507, 7226

98C6 (e98 ) 0'90·1·05 0'50-0'80 IS: 2507, 31~J~, 72~6

113C6 (C113 ) 1'05·1'20 0'50·0'80 IS: 3195

S

IS : 1570(P8rt 2/Sttc 1) • 1878

2.! 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 sizel~ 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 S·65vAwhich 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'Ior of 1 100 divided by the actual tensile strength in kgf Imml

when 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

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

TABLE 1 SPECIFIED TENSILE LIMITS FOR PLATES, SECTIONS, BARS,BILLETS AND FORGINGS IN THE HOT-ROLLED OR NORMAUZED

CONDITION

( Clause 2.3)

I) 1';S10NAT ION' TENSILE ELONOATION PERCENT, Minr------,J...-----~ STBJDNOTH

New Old(1) (2) (3) (4)

MPa·

7C4 (C07 ) 320-400 2710C4 (CIO) 340-420 2614C6 ( C.14 ) 370-450 2615C4 ( CI5 ) 370·490 2515C8 (ClSMnZ2 ) 420-500 2520C8 (C20 ) 440-520 2425C4 (C25 ) 440-540 2325C8 (C25Mn75 ) 470-570 2230C8 (e30 ) 500·600 2135C4 (C~5 ) 520-620 2035C8 (C35Mn~ ) 550·650 20.weB (C40 ) 580·680 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 the 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:= 0·1020 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

DE

SIG

NA

TIO

Nr-

,...

A-~

New

Old

TA

BL

E3

SP

EC

D1E

DT

EN

SIL

EL

IMIT

SFO

RC

OL

D-D

RA

WN

BA

RS

[C

14w

lSO

.3(d

)and

2.3

]

Up

TO

20m

mO

VE

R20

mm

OV

ER

40m

mr-----.A

..-----"-\

Up

TO

40m

mU

pT

O63

mm

Ten

sile

Elo

ngat

ion

r-----A

.~

r---

-A..

----

1S

tren

gth

Per

cent

,M

illT

ensi

leE

long

atio

nT

ensi

leE

long

atio

nM

iaS

tren

gth

Per

cent

,M

inS

tren

gth

Per

cent

,M

inM

inM

in

..& en ~ o~

-a • ::I. ~O

VE

R63

rom

3r-----..A.---~

..&

Ten

sile

Elo

ngat

ion

~S

tren

gth

Per

cent

,M

in...

&

Min

(0 ~(1

)(2

)(3

)(4

)(5

)(6

)(7

)(8

)(9

)(t

o)10

MP

a·M

Pa·

MP

a·M

Pa-

lOC

4(C

IO)

490

1145

013

410

1536

018

15C

8(C15Mn~)

540

1151

013

470

1543

018

20C

8(C

20)

540

1051

012

470

1543

018

3OC8

(e3

0)

610

957

010

530

1249

015

40C

S(C

40

)64

08

610

957

010

540

125O

C4

(OW

)67

07

630

861

09

590

10

55C

8(C55Mn~)

730

769

08

670

963

010

*lM

Pa

==IN

/mm

l=

0·10

20kg

fjm

ml.

IS : 1570(Part 2/Sec 1) ·1979

TABLE .. SPECIFIED MECHANICAL PROPERTIES FOR BARS ANDFORGINGS IN THE HARDENED AND TEMPERED CONDITION

( Claus, 2.3 )

DESIGNATION TENSILE YIELD EI.ON'OATION, IZOD LIMITINGr-------.A.---~ STllENOTH STRESS PEItCENT, IMPACT RUI.INO

New Old Mill Min VALUE, SECTION(II' SPEOIFIED) Min

(I" SPEOI~IED)

(1) (2) (3) (4) (5) (6) (7)

MPa· MPa- Joules mm

SOC8 (C30 ) 600-750 400 18 55 3035C8 ( C35Mn75) 600-750 400 18 55 63

40CB (C40 ) {600-750 380 18 41 100700·850 480 17 35 30

45C8 (C45 ) {600-750 380 17 41 100700-850 480 15 35 30

50C4 (CSO) rOO-85O 460 15 63

800-950 540 13 30

55C8 (C55Mn75 ) rOO-850 460 15 63800-950 540 13 30

*lMPa == IN/mm l .. 0·1020 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 LIMITING

r-----.A----~ STRENGTH, PERCENT, MIn VALUE, Min RULING

New OJd u.« (IF SPECIFIBD) S~('TI0N

(1) (2) (3) (4) (5) (6)

MPa· Joules mrn

10C4 (CIO) 500 17 55 15

14C6 (C14 ) 500 17 55 Over 15Up to 30

15C8 (C15Mn75 ) 500 17 55 30zoca ( C20) 500 16 55 30

*IMPa == IN/mm l == 0-102 0 kgf/mm l •

9

IS : 1570(P.rt 2/Sec 1) .1870

TABLE' SPEClnED TENSILE LIMITS FOR MILD STEEL SHEET ANDSTRIP IN THE COLD-ROLLED AND ANNEALED CONDITION

( Claru, 2.3 )

DESIGNATION

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

New Old

TENStl..ESTRF:NOTll

Min

ELONOATJON, 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)

2828

2525

.1MPa lID IN/mmS == 0-1020 kgf/mml •

TABLE 7 SPEClnED TENSILE LIMITS FOR MILD STEEL SHEET ANDSTRIP IN THE COLD-ROLLED CONDITION

(Clawe 2_3)

DESIGNATION

r----.A..----,New Old

CONDITION TENSILESTRENO',fH

(1)

15C4

(2)

(CIS)

(3)

( ~larter hard~ Half hardLHard

(4)MPa·

gOO-470470-570570 Milt

.1MPa -= IN/mm l = 0-1020 kgf/mm l •

10

IS : 1570(Part 2/Sec 1) • 1979

ELONGATION

PEltCENT,

Mi"

TABLE 8 SPECIPIED TENSILE LIMITS FOR TUBES IN THECOLD·DRAWN AND ANNEALED CONDITION AND IN THE COLD·DRAWN

OR COLD-DRAWN AND TEMPERED CONDITION

( Claus, 2.3 )COLD-DRAWN COLD-DRAWN OR

AND ANNEALED COLD-DRAWN,---_.A.-__~ AND TEMPERED

Tensile Yield r----..A.---,Strpngth, Stress, Tenaile Yield

Min Min Strength, Str~9S,

Min Min

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

(1) (2) (3) (4) (5) (6) (7)MPa· MPa· MPa· MPa·

14C6 (C14 ) IJ5C·j. (CI5) j 320 J70 440 38 95015C8 (C15Mn75 ) -1;g on gauge length20C8 (C20)- 370 220 520 42 = 5·(j5~A25C4 (C25) }2S<'~8 ( C25Mn7~ ) 390 250 S<JO 46 or

35C4(C35) l 1100

440 280 580 47 TS-- on gauge length35C8 (C35Mn75 ) I45( 8 (C45)-

520 340 700 60 i = 4Y.i5U<a2 (C50Mnl) J J

·lMPa = IN/roms == 0-102 0 kgf/mm l .

TABLE 9 CONVERSION OF RECTANGULAR AND SQUARE SECTIONSINTO EQ.UIVALENT RULING SECTIONS, OIL Q.UENCHING

( Clause 2.3 )\V J l)'f 11 OF T'n JCKNESS OF SECTluN

SEC1'JOS ~-------------~---------------~10 20 30 '10 50 60 80 100 120 140

mrn mm mm mm rom rom m rn HIm 111m mrnDIAMETl~lt OJ!' EQUIVALENT ROUNDS

( 1) (2) (3) (4) (5) (G) (7) ~8) (9) (10) (11)Dim m m mm mm mm mm mm mm m m m rn m m

10 1020 14- 2130 Hi 26 3240 17 29 37 4350 17 31 40 48 5460 17 32 43 51 59 f;580 17 32 46 57 66 74 87

100 17 3~~ 47 (>0 71 80 96 108120 11 33 43 (,2 7·l 85 102 117 130]~O 17 33 48 {.3 i(; 83 108 12J 140 1:)2HID 17 33 48 b3 77 91 112 J31 148 xlHO J7 3'~ 43 ()3 77 ~11 1J5 13(i Ij1 X200 17 :~3 43 (.3 7B ~2 117 140 X X:l25 17 ~~3 48 G3 78 Y2 119 143 X X250 17 33 48 (l3 78 92 I~O 145 X X300 17 33 48 63 78 92 121 148 X X350 and over 18 33 49 63 78 92 121 150 X X

X Greater than 160 tum.

11

IS : 1570(Part 2/Sec 1) ·1979

TABLE 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 20

30 15 24 3040 16 27 34- 4Q

50 16 29 38 45 5160 17 30 41 49 55 61

80 17 32 45 54- 62 70 81

100 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 X

225 18 35 52 69 85 98 121 142 X X

250 18 36 53 70 86 100 125 147 X X

300 18 37 54 71 88 104- 131 155 X x350 and over 20 39 59 78 97 115 152 X X X

X Greater than 160 rom.

12

IS : 1570(Part 2/Sec 1) • 1979

A PPENDIX A( Clause 0.4 )

NEW SYSTEM OF DESIGNATION OF STEELS

A-I. GENERAL

A-I.I The new system of designation of steel is based on the draft ISOproposal submitted by India to ISO/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 CHEMICALCOMPOSITION

A-2.1 Unalloyed Steels (as 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 manganese

content. 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 is

killed, 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 the 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

IS : 1570(P8rt 2/Sec 1) • 1978

3) Degree of purity - The sulphur and phosphorus levels ( ladleanalysis) shall be expressed as follows:

Symbol Maximum Contenl in Percent,----------"'--

Phosphorus Sulphur

P25 0·025 0·025P35 0-035 0-035P50 0'050 0'050P70 0'070 0'070

No symbol will mean 0-055 0·055

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 nearest

integer.b) 100 times the maximum phosphorus rounded off· to the nearest

integer.

Example:

Maximum sulphur -= 0'045 percentMaximum phosphorus - 0'035 percent

Designation: SP 44.4) Weldability guarant« - Guaranteed weldability of steel as deter­

mined .by tests mutually agreed between the supplier and themanufacturer shall 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 " C BO " 'B2' or 'B4 t

indicating 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 : 2·1960 Rules rorrounding off numerical value. ( "ois,d ).

14

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

Steels B, BO, B2 and B4 are characterized 'by an average V-notchCharpy impact value according to the following table:

Steels Specified UTS Ranger-------------.»;--------------~

370 to 520 MPa· 500 to 700 MPa·r------.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 -10

40 0B2 28 -20 28 -30

40 -20Bil 28 -40 28 -50

40 -40

6) 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- If no symbol is used, it ahall 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.: - If no symbol is used, it shall mean that the steel is of commercialqualit}"

·IMPa - IN/mml = 0'1020 kgf /mm l ,

IS

IS : 1570(Part 2/Sec 1) ·1979

8) Surface finish ( applicable to sheet only) - 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, andI~ 14 = direct annealed finish.

9) Treatment - The following symbols shall 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, it means that the steel is hot-rolled.

-Includes t ernpcring, if done.

16

IS : 1570(Parf 2/Sec 1) - 1979

10) Eleuated temperature properties - For guarantee with regard toelevated temperature properties, the letter CH' shall 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 0·25 percent carbonand 0·5 percent manganese content and resistance tobrittle fracture grade no.Steel with average 0·45 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:

2·lC5BO

17

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