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है”ह”ह

IS 1762-1 (1974): Code for designation of steels, Part IBased on lettter symbols [MTD 4: Wrought Steel Products]

Gr3

IS : 1762 (Part I) -1974(Reamrmed 2003)

Indian StandardCODE FOR DESIGNATION OF STEELS

PART I BASED ON LETTER SYMBOLS

(First Revision)Fourth Reprint AUGUST 2007

(Including Amendment No.1)

UDC 669.14: 003.62

© Copyright 1975

BUREAU OF INDIAN STANDARDSMANAK BHAVANt9 BAHADUR SHAHZAFARMARG

NEWDELHI 110002

July1975

IS i 1762 (Part I) -1974

Indian StandardCODE FOR DESIGNATION OF STEELS

PART I BASED ON LETTER SYMBOLS

(First Revision)Metal Standards Sectional Committee, SMDC

ChairmanSURI A. K. BHATTACRARYYA

Rlpresentin,Ministry of Railways

Ltd,

Ministry of Defence (DGI)Instrumentation Ltd, Kota

Members

JOINT DIBEO'l'OR ( M & C) } .AS818'f ANT DIRECTOR ( MS ) ( Alternates to Shrl A. K. Bhattacharyya )

SHBI M. ANJANEYULU Mining and Allied Machinery CorporationDurgapur

SHIU N. V. RAGBAVAN (Alt,rnate)])8 A. S. BHADURI National Test House. CalcuttaSu ar D. D. BHUPTANI Indian Tube Co Ltd. Calcutta

SORI O. N. AOARWAL (Alternate)SaRI P. K. CHAKRAVABTY The Tata Iron & Steel Co Lcd. Jamshedpur

SURI M. C. KUMARA8WAMY ( Alumau )SHRI G. CRATTERJEB Hindustan Steel Ltd, Ranchi

8l1BI K. C. SOM ( Alt,rnat, )SURI P. K. CHATTERJEE

SRRIN.S.CHAUDHARVSHRt J. S. SERMI t Alternat,)

SaRI B. N. DA8

SUBI N'. T. GEORGESRRI A. K. GUHA

National Metallurgical Laboratory ( CSIR),Jamshedpur

Ministry of Defence ( R&D)Directorate General of Supplies & Disposals

( Inspection Wing), New DelhiSURI P. C. MUS'l'AJ'I ( Alternat, )

DB. S. S. KHANNA Heavy Engineering Corporation Ltd) RanchiSHRI A. N. RAo ( Alternat« )

DR D. M. LAKHIANI Indian Iron & Steel Co Ltd, BurnpurSHRI T. K. DUTTA ( Alumat« )

SaBl U. MODAN RAO Bharat Heavy Electricals Ltd, BhopalSUBI B. K. MURTHY Indian Aluminium Co Ltd, Calcutta

SURI N. GOPAL KRISHNAN ( Altnnat, )SURI S. K. ORRI Bharat Heavy EJectricals Ltd, HardwarDR S. R. PRAMANIK Ministry of Steel and Heavy EngineeringSURI M. K. RAO The Binani Metal Works Ltd. Calcutta

SaRI A. K. CHATTBBJIDE (Alt'rnate)( ContinUld on /Jal' 2)

C> Copyright 1975BUREAU OF INDIAN STANDARDS

Thil publication i. protected under the I,.dia CoP.1ri,hl ~cl (XIV of 19~7) andreproduction in whole or in part by any means except with written permission of thepublimer &hall be deemed to be an infringement of copyright under the laid Act.

IS z1762 (Part I) -1974

(ContinUld from pa"~ 1 )

M,mlJns

SRRIS.RoYReprlstnti",

Indian Non-Ferrous Metals Manufacturers'Association, Calcutta

SUBI A. K. BARU ( Altentat, )SUBI V. K. W A,ZIR Institute of Indian Foundrymen, Calcutta

HONORARY SECRETARY ( Alt,rnate ) .SURI C. R. RAMA RAO, Director General, lSI ( Rx-officio Membtr)

Director (Struc & Met)

StcretarySURJ VIJAY KUMAR

Assistant Director ( Metals), IS)

2

AMENDMENT NO. 1 NOVEMBER 1980

TOIS:1762(Part 1)-1974 CODE FOR DESIGNATION OF STEELS

PART I BASED (It LETTER SYt80LS

(Fir8t RevilJion)

f.0!.r!9!ndU!!!

(Page 8~ a'Lause 3.1.1.1~ E%t%I'IfE'le8~ line 14) ­Substitute 'Fe 510 B' to%' 'Fe 510 Ba'.

a.Lterat10!1

(Page 6~ atausB '.1.1.1):

a) Item (e), para!~ line 1 - Substitute 'I 000time8'fo~ '100 times'.

b) Item (c)(l) d"d (c)(2), tine 1 - Substitute, '1 000 times' fol' '100 times' at both the

places;

(sMDC 1)

15.1762 {Part 1)-1974

Indian StandardCODE FOR DESIGNATION OF STEELS

PART I BASED ON LETTER SYMBOLS

(First Revision)

o. FOR E WORD

0.1 This Indian Standard (Part I) (First Revision) was adopted by theIndian Standards Institution on 31 October 1974, after the draft finalizedby the Metal Standards Sectional Committee had been approved by theStructural and Metals Division Council.0.2 This standard was first published in 1962. The digital system ofdesignation has since been adopted by many countries and is most suitedfor computer applications. It was, therefore, decided that this standardshould be revised in two parts. 'This part ( Part I ) covers the designationof steel based on letter symbols and Part II will cover designation ofsteel based on numerals,0.3 It is intended that only the minimum number of symbols shall beused in designating any steel. The Sectional Committee, therefore,decided that no symbols be used for the most common quality of steel orfor most common applications. An example to illustrate this basicprinciple is that no symbol is used to denote semi-killed quality of steelwhich comprises 90 percent of the total production of steel.0.4 While formulating this standard, the Committee has given dueconsideration to the Fifth draft proposal on classification of steels underconsideration of ISO ITC 17/Sa 2 Secretariat of which is held by India.0.5 The units commonly used in Indian Standards and the correspondingSI units are given in Appendix A for information.

1. SCOPE1.1 This standard ( Part I ) covers the code designation of wrought steelbased on letter symbols.

2. TERMINOLO~Y2.1 For the purpose of this standard, definitions given in IS: 1956-1962*shall appIy.

-Glossary of terms relating to iron and st~el.

3

IS I 1762 (Part I) ·1974

3. CODE DESIGNATION OF STEELS BASED ONLETTER SYMBOLS

3.1 For the purpose of code designation, steels shall be classified asfollows:

a) Steels designated on the basis of mechanical properties, andb) Steels designated on the basis of chemical" composition.

3.1.1 Steels Designated on the Basis of Mechanical Properties - These steelsare carbon and low allow steels where the main criterion in the selectionand inspection of steel is \he tensile strength or yield stress. I n suchcases, provided the specified mechanical properties are attained, it is notusual to specify a detailed chemical composition but the quality of thematerial is designated where necessary by specifying certain qualitylevels.

The code designation shall consist of the following in the ordergiven:

a) Symbol C Fe' or C FeE J depending on whether the steel has beenspecified on the basis of minimum tensile strength or yieldstress.

b) Figure indicating t he minimum tensile strength or yield stressin N/mm 2• If no minimum tensile or yield strength is guaranteed,the figure shall be 00.

c) Chemical symbols for elements the presence of which characterizethe steel,

d) Symbol indicating special characteristics covering method ofdeoxidation, steel quality, degree of purity, weldability guarantee,resistance to brittle fracture, surface condition, formability,surface finish, heat treatrnen t, elevated temperature and lowtemperature properties.

e) Symbol indicating applications, if necessary.

3.1.1.) E:rplallatory notes for special characteristicsa) Method of deoxidation - Depending on whether the steel is killed,

semi-killed or rimming variety, the following symbols shall beused to indicate the steel making practice:

i) R for rimming steel, andii) K for killed steel.

NOTE - If no symbol is used, it shalJ mean that the steel i. of semi-killed type.

b) Steel qualiry - The following symbols shall be used to indicatesteel quality:

QI-Non-ageing quality,Q2- Freedom from flakes,Q3 - Grain size controlled,Q4 - Inclusion controlled, andQ5- Internal homogeneity guaranteed.

4

= 0'045 percentt:-..: 0·035 percent

18.1162 (Part I) -1974

c) Degre« of purity - The sulphur and phosphorus levels (ladleanalysis) shall be expressed as follows:

Symbol Maximum Content in Percent~-------~-------~

Phosphorus Sulphur

P25 0'025 0'025P35 0'035 0'035P50 0'050 0·050P70 0·070 0·070No symbol will mean 0'055 0·055

The above symbols use the letter' P' followed by 100 times themaximum percentage of sulphur and phosphorus. In case the maximumcontents of sulphur and phosphorus are not same, the followingprocedure shall be followed:

Symbol SP shall be used to indicate the levels followed by:

1) 100 times the maximum sulphur rounded off· to the nearestinteger.

2) 100 times the maximum phosphorus rounded off· to the nearestinteger.

Example:

Maximum sulphur. Maximum phosphorus

Designation: SP 44.

d) Weldability guarantee- Guaranteed weldabiJity of steel as deter­mined by tests mutually agreed between supplier and manufacturershall be indicated by the following symbols:

W = Fusion weldable, andU'I = Weldable by resistance welding but not fusion weldable.

e) Resistance to brittle fracture- Symbol 'B') 'BO', 'B2 J or 'B4'indicating resistance to brittle fracture based on the results of theVvnotch 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 shall be done according to the rules Biven in IS: 2·1960 Rules (orrounding off numerical value. ("""11).

5

1111762 (Part 1)-1974

(5)

27- 10

o- 30- 20- 50-40

- 20

- 4028

28B2

B4

(1)

BBO

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

Steels Specified UTS Range~ A ~

370 to 520 N/mml 500 to 700 N/mml

,----~----~ ~----~----~Energy Temp °0 Energy Temp °C

J J(2) (3) (4)2H 27 40

28 0 2840

28402840

f) Surface condition - The following symbols shall be used toindicate surface condition:

S1 - Deseamed or scarfed;82 - Descaled;53 - Pickled (including washing and neutralizing );84 - Shot, grit or sand blasted;85 - Peeled (skinned);

86 - Bright drawn or cold rolled; and87 - Ground.

NOTJI - If no symbol is used, it shall mean that the surface is in a. rolled or .1forged condi tion,

g) Formabili~ (applicabll to sheet onl1 ) - The following symbols shallbe used to indicate drawability:

Dl - Drawing quality,D2 - Deep drawing quality, andD3 - Extra deep drawing quality.

NOTE - If no .ymbol is used, it shall mean that the steel il commercial quality.

h) Surface finish (applicabl, to sheet onh) - The following symbolsshall be used to indicate the surface finish:

Fl - General purpose finish,F2 - Full finish,

6

IS 11762 (Part 1)-1974

1;3 - Exposed,

F4 - Unexposed,F5 - Matt finish,F6 - Bright finish,F7 - Plating finish,F8 - Unpolished finish,F9 - Polished finish,

FlO - Polished and coloured blue,Fll ~ Polished and coloured yellow,

Fl2 - Mirror finish,F13 - Vitreous enamel finish, andF14 - Direct annealed finish.

Treatment - The following symbols shall be used to indicate thetreatment given to the steel:

Tl - Shot peened,T2 - Hard drawn,T3 - Normalized",1'4 - Controlled rolled,T5 - Annealed,T6 - Patented,T7 - Solution treated,T8 - Solution treated and aged,T9 - Controlled cooled,

TIO - Bright annealed,TIl - Spherodized,T12 - Stress relieved,T13 - Case hardened", andTl4 - Hardened and tempered.

lTB - If no symbol i. used, it means that the steel is hot rolled.

Elevat,d temp,ratu" propertils - For guarantee with regard toelevated temperature properties, the letter C H' shall be used.However, in the designation only the room temperature proper­ties shall be shown. Elevated temperature properties shall beintimated to the purchaser separately by the manufacturer.

ude. tempering if done.

7

1811162 (Part 1)-1914

m) Cryogenic quali{y - For guarantee with regard to low temperatureproperties, the letter' L' shall be used. However, only the roomtemperature properties shall be indicated in the designation.

Examples::Fe 410 c« K Killed steel containing copper as alloying element

with a minimum tensile strength of 410 N/mml

FeE 300 P 35 Semi-killed steel with a minimum yield strength of300 N/mml and degree of purity as follows:

S & P = 0·035 MaxFe 470 W Steel with a minimum tensile strength of 470 N/mm'and of guaranteed fusion welding qualityFeE 550 56 Bright drawn or cold rolled steel with a minimum

yield strength of 550 N/mm 2

FeOO R Rimming quality steel with no guarantee of minimumtensile or yield strength

FeE 590 F7 Sheet steel of plating finish and minimum yieldstrength of 590 N/mm 2

Fe 510 Ba Steel in annealed condition with a minimum tensilestrength of 510 N/mm l and resistance to brittlefracture = B

Fe 710 H Steel with guaranteed elevated temperature propertiesand a minimum room temperature tensile strength of710 N/mrn'

Fe 4) 0 QI Semi-killed non-ageing quality steel with S & P =0·055 Max and minimum tensile = 410 N/mm l

Fe 600 T4 Semi-killed steel in controlled rolled condition witha minimum tensile strength of 600 N/mm l

Fe 520 L Cryogenic quality steel with a minimum roomtemperature tensile strength of 520 N/mm l

3.1.2 Steels Designated on the Basis of Chemical Composition

3.1.2.1 Unalloyed steels (as dtjined in IS: 7598-1974*) - The codedesignation shall consist of the following in the order given:

a) Figure indicating 100 times the average percentage of carboncontent,

b) Letter C C'J and

c) Figure indicating 10 times the average percentage of manganesecontent. The figure after multiplying shall be rounded off to thenearest integer according to the rules given in IS : 2-1960t.

·Clauification of steel•.tRulel for rounding off numerical value- (r,vis,d).

8

1811762 (Part 1)-1974

ymbol indicating special characteristics including guaranteedardenability for which symbol •G' shall be used at the end ofie designation. ( For special characteristics, see 3.1.1. )

~BO Semi-killed steel with average 0-25 percent carbon ando-s percent manganese content and resistance tobrittle fracture grade BO.

lOG Steel with average 0-45 percent carbon, 1 percentmanganese and guaranteed hardenability

~.2 Unalloyed tool steels- The designation shall consist of:~igure indicating 100 times the average percentage of carbon;

lymbol ' T' for tool steel; and~igure indicating 10 times the average percent manganese.ontent.

5 Unalloyed tool steel with average 0-75 percent carbonand 0-5 percent manganese

11 Unalloyed tool steel with average carbon content of0-80 percent and I-I percent manganese

Z.3 Unalloyed free cutting steels - The designation shall consist

Figure indicating 100 times the average percentage of carbon;

Letter' a';Figure indicating 10 times the average percentage of manganese;Symbol'S', 'Se', 'Te' or ' Pb ' depending on the element presentwhich makes the steel free cutting followed by the figureindicating 100 times the percentage content of the element. Inthe case of the phosphorized steels the symbol cpt shall beincluded; andSymbol indicating special characteristics covering the method ofdeoxidation, surface condition and heat treatment (for explana­tory notes on special characteristics, see 3.1.1 ).

s:lOS14K Free cutting steel with average 0-35 percent carbon,

I percent manganese and 0·14 percen t sulphur, killedquality.

:I2Pb15T14 Free cutting steel with average 0·15 percent lead,0-20 percent carbon and 1-2 percent manganese,hardened and tempered.

9

10·Cla.sification of steel.,

IS 11162 (Part I)-1974

3.1.2.4 Alloy stuls (as d¢ned in IS: 7598·1974·):a) Low and medium alloy stuls (total alloying elements not exceedin,g 10

percent) - The designation of steels shall consi~t of:1) Figure indicating 100 times the avera~e percentage carbon,2) Chemical symbols for alloying elements each followed by the

figure for its average percentag~ content multiplied by a(1ctoras ~iven helow:

NO'I'!': 1- Thfl figure aftflf multiplying shall be rounded orr to the npm~t

integer.NOTE 2- Symbol (Mn' for manganese shall bp iacluded in case manganese

content is equal to or greater than Iperrent,

NOT! 3_.The chemical.ymbols and their figures shall be listprt in the desiKnationin the order of decreasingcontpnt.

3) Symbol indicating special characteristics covering degree ofpurity hardenability, weldability guarantee, pleva ted tempera·mre properties, surface condition, surface finish and heattreatment (for details see explanatory notr~ under 3.1.1and 3.1.2.1 ).

Examples:

25Cr4Mo2G Steel with ~llaranteed hardenability and havin~

average 0'25 percent carbon, 1percent chromiumand 0'25 percent molybdenum

40Ni8Cr8V2 Hot rolled Heel with average 0'40 percent carbon, 2percent chromium, 2perrent nickel and 0'2 percentvanadium

b) High alloy steels (total alloying elemtllts more than 10 percent) - Thedesignation shall consist of:

I) Letter 'X'.2) Figure indicating 100 times the percentaKe carbon content.3) Chemical symbol for alloying elements each followed by the

figure for its average percentage content rounded off to thenearest integer (see Note 2under 3.1.2.4 ).

4) Chemical symbol to indicate specially added element toattain the desired properties.

5) Symbol indicating specific characteristics covering harden­ability, weldability guarantee, elevated temperature properties,surfac~ condition, surfare finish and heat treatment (forexplanatory notes on special charact~ristics SIt 3.1.1 ).

kgf

kgf/mm2

kgf.m

APPENDIX A(Clause 0.5 )

UNITS USED IN INDIAN STANDARDS AND THECORRESPONDING 81 UNITS

Units in Metric System Comsponding SI Units

Newtons (N)

N/mm'joules

11

Examples:

X15Cr25Nil~S40 Alloy free cutting steel with carbon 0'15 percent,chromium 25 percent, nickel 15 percent andsulphur 0'40 percent,

XI2CrlRNi3S25 Alloy free cutting steel with 18 percent chromium,nickel 3percent and sulphur 0'25 percent.

E,ramples:

XIOCrl8Ni9S3 Steel in pickled condition with average carbon 0'10percent, chromium 18 percent and nickel 9percent.

XI5Cr25Nil2 Steel with ,0'15 percent carbon, 25 percent chromiumand 12 percent nickel

c) Alloy too! steels - The ~teel designation shall be as for low, mediumand high alloy steels as given under (a) and (b) above exceptthat the. sym,bol 'T' will be in~luded in the beginning ~f .t,h~d~signatlOn 01 low alloy and medIUm alloy tool steels and Xrinstead of' X' in the case of high alloy tool ~te~ls,

Examples:XT75WIHCr4Vi High alloy tool steel with average carbon

0'75 percent, tungsten 18 percent, chromium4peront and vanadium 1percent

XT98WGMo5Cr4Vi High alloy sle~l with average carbon 0'98 percent,tungsten 6 percent, molybdenum 5 percent,chromium 4percent and vanadium 1percent

d) Fm ruttillg alloy steels - The \teel ~e~ignation shall be as for low,medium and high alloy steels as glVf'n under (a) and (b) aboveexcept that d~pending on the pprrent,age of 8, Se, !e and Zrpresent the designation shall also conSISt of the chemIcal symbolof the :lement present fi)lIowed by the figure indicating 100 timesits content.

IS 11762 (Part I)·1974

Multiprying Faclor

410

100

Elemellt

o, Co, Ni, Mn, Si and WAI, Be, V, Ph, ell, Nb, Ti, Ta, ZI' and MoP, S,N

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