IS : 1570(Part2/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 ( Incorporathg Amendment No. 1) UDC 669.14 (083.4 ) 0 Copyright 1999 BUREAU MANAK OF INDIAN STANDARDS ZAFAR MARG BHAVAN, 9 BAHADUR SHAH NEW DELHI 110002 Gr 5 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 ) 19 Repesmling Steel Authority Durgapur Guest, National The Tata Keen, of India Ltd (Alloy Steels Plant ), Alloy Steels and Special Steels Sectional Committee, SMDC Chairman DR G. MUKHERJEE S~nr 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) SHRI P. K. CHATTCKJEE Williams Ltd, Howrah Calcutta Test House, Iron & Steel Co Ltd, Jamshedpur ,_ 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. S. K. R. N. Howrah Ministry of Defence ( DGI ) ( Coatinued on page 18 ) 2 . Williams Ltd. P. S. SEEI A. S. BABU P. DAS ( Altmafr ) SHEI L. VAIDYANATHAN SARI C. SEN ( Alternafa ) Guest. SAHA ( A&mats ) Research & Development Centre for Iron and DE V. Jamshedpur SHRI S. Calcutta Director hretary General. NARAYANA ( Al&mate ) Mahindra Ugine Steel Co Ltd. R. M. S. N. C. CRATTERJEE Sunr M. PA1 ( Aftmatc ) Mahindra Ugine Steel Co Ltd. of Defence Engineering (R & D ) Corporation Ministry Heavy Ltd. K. Ranchi Directorate General of Technical Development. PA1 Saxr B. bfEHl%A SRRI D. Bombay Pune Forge Co Ltd. N. N. K. Calcutta Ministry of Defence ( DGOF ) M.Tata Iron i?z Steel Co Ltd. K. Bombay Iron & Steel Control. CEAKRAV~TY Membm SERI The. Keen. PANDAY ( Ahnate ) SERI R. RAMA RAO. ROY SHRI D. SMDC 19 : 5 San1 P. RAMA PBASAD ( AIlera& II ) The Tata Engineering and Locomotive Co Ltd. RAMASWAYY Steel ( HSL ).IS : 1570(Part 2/Set 1) . BANERJEE ( Al&mu&) Ashok Leyland Ltd. Bombayj and Alloy Dg R. IS1 Subcommittee for the Revision of Schedule for Wrought Steel for General Engineering Purposes. SIJBRAHWANYA SHRI K. SIZINIVASAN Da S. MONDAL ( Alternuls) Jamshedpur Steel Furnace Association of India. PATEY Steel Producers’ Association of India. Ranchi SHRI S. M. LAKKUNDI ( Allcraals) DE D. New Delhi San1 M. RAN~ASHAI San1 SANJIT SEN (AIlmate I) SwnrP. PRAMANIK SARI S. DAVE ( Altmate ) SRB~ C. IS1 ( Ex-ofiio Member ) SHRI VIJAY KUMAR Assistant Director ( Metals ). Calcutta SHRI M. KHARE SHBI V. J.1979 ( contimsed~ompage1 ) Members S. LAEIBI SHBI I. Bombay SHRI R. KOTHAWALE Saab S. K. K. Bangalore Sanx M. Mundhwa. Dastur & Co Pvt Ltd. Director ( Strut & Met ) DR S. Madras Saul A. K. BHATIA ( Afremek ) SHRI K. MEDIRATTA ( Altcmafe ) Hindustan Machine Tools Ltd. K. K. MIEEBA S~sr Indian Bharat Register Reprcseafing of Shipping. PADMANABHAN Firth India Steel Co Ltd. V. K. R. Thane SEaI I. CEATTEBJEE ( Altmafc) SHRI Y. 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. b) New grades 2C2. tCode for designation of steels: Part I Based on letter symbols.6OC6 have been added. d) Mechanical properties for cold-drawn bars given in Table 3 have been modified on the basis of experience gained. 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. *Already published as IS : 1570 ( Part V )-1972. for the sake of easy identification old designations are also given within brackets.2 Schedules for wrought steels for general engineering purposes ( IS : 1570-1961 ) was first published in 1961. C55 ( 55C4 ). 5OC8. 3 . On the basis of the experience gained in the production and use of steels.1 This Indian Standard ( Part II ) ( First Revision ) was adopted by the Indian Standards Institution on 5 March 1979. However. c) .Manganese content of grades CO5 ( 5C4 ). after the draft finalized by the Alloy Steels and Special Steels Sectional Committee had been approved by the Structural and Metals Divisjon Council.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. the Sectional Committee has The other parts of decided to revise the standard and issue it in parts. 0.IS : 1!57O(Part 2/Set 1) . FOREWORD 0. and C60 ( 6OC4 ) have been modified. the silicon content has not~been specified. 2.4 This schedule does not give limits for sulphur and phosphorus. given in this schedule should not be made unless special conditions of service render this essential.2 In addition to specified mechanical properties. 2. 1. steels listed in this schedule shall be selected. The standard ranges for sulphur and phosphorus and the method for designating steel according to its sulphur and phosphorus content.1 While or revising existing standards. expressing the result of a test or analysis. the silicon content or the type of steel.1 This schedule may be used for ordering steels provided specification is available for the particular steel.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. should be included in the standard. observed or calculated.5 For the purpose of deciding whether a particular requirement of this standard is complied with. but as in many cases. the steels of lower carbon content are required as rimming. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. laid down in the schedule ( see Table 1 ). 4 . GENERAL no detailed 2. and phosphorus are required according to the severity of the conditions in service.B : %7o(p8tt 2/&C 1) . 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. Where necessary. Since different levels of sulphur etc. and its approval obtained. ScofE 1. conditions of service. killed. ranges for carbon and manganese are. 1. preparing Indian Standards. In that event.1. These have to be specified in the detailed specifications. etc. *Rules for rounding off numerical values (rcvhcd). The specification of mechanical properties different from those. semi-killed.1979 0. the final value. 0. for example. This schedule is not intended to be used as a standard. steel making practice and method of deoxidation is detailed in Appendix ‘ A ’ for information. 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. shall be rounded off in accordance with IS : 2-1960*. SMDC 19. semikihed or killed steel depending on the subsequent manipulation and conditions of service. 4072 IS : 2507. 3195.7226 IS : 2507.3~0’40 @35-0.50 Md* 0’40-0-70 0*30-0. 7226.30 O-25-0-35 @30.8. 6’y27.0.4072 IS : 2507..60 @50-OfrJ 0. 3885. 5517.65 @60-O-70 0*65-0.7226 IS ~2507.2507.0. 2004.IS : 157O(Paft TABLE i (IPECIPPID CARBOhIAND 2/Set 1) l 1979 MANGANESE LIMITS STE~CL DWIWATION [ SC6IS: 1762 (PABT I)-19741 ~_-_-_-_---_~ PBlWQtT C Mn hBCBNT (4) 0.80 0.09 Mai *lo Max 0.4432 : 1875.6967 IS : 1t. : 1875.65 0.75 0*70-0.40 1”wix 050 Mu 0.040 9. 3930. .2004 - 9 - ) IS : 1875.80 New 2c2 4c2 ~5C4 7C4 lOc4 14c6 l5c4 15c8 2oc8 25C4 25C8 3oc8 3m 35c9 4oc8 45C8 5oc4 5Oc8 5OC12 55c4 5503 6Oc4 6OC6 65C6 7OC6 75C6 8OC6 85C6 98C6 llYC6 Old (1) (2) (co5) (co7) (-Cl0 ) (Cl4) (C15) (C15Mn75) (c20) (~25) ( C25MnE (C30) (C35) ( C35Mn75 (C40) (C45) (C50) (CSOML (C55) ( C55Mn72) (C60) (0) (C70) (C75) (C80) (C85) (C98) ( Cl13 ) ) (s-4~) (3) 0. 2004. IS : 5517.20 Max 0*10-O-20 0-15-0’25 0*20-0*30 ocm0.60 0-609’90 0*60-090 0~30-0%0 0%0-o-90 0+0-090 ~3O-O%g o%O-0.50. 2004. 7226 IS : 3195 IS : 1875. 4432.55~0.4397 IS IS 040-0%6 5489 IS : 1812 IS :. 2004.80 @50-O-80 0.5517 .8054. 6967 IS : 1875.45.7 2004.05 1.0.2004. 7283 IS : 1875.40 &fax 0.90 090-1. 5517.50. 1875. 3885 IS : 2507.75-0.90 0%0-O% 0*60@0 O-30-O-60 0’60-0~ 1~10-1’40 0’30-060 o%O-0.4072.X. 3930 : .7226.45 O-40-050 0-45-O-55 0.65 0. 2507.85 0.80 0. 3930.80.90 O%W60 ~50-0*80 0’50-0-80 0*50-0.q55 O-45-0. 3261.8055 3445.05-l-20 IS : 48S2.U&lj. 5517. IS : 1812. IS : 5517 IS IS ) : 2507. 3930.12 Max O-15 Max &IO-O*18 0. 3930.2879.05 &&TX 0.55-0.50-O-80 0*50-O-80 0*50-0. some adjustment of the specified tensile range for a particular range of composition. if required. Different types of test pieces are used for the tensile test depending on the form of the material.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.IS : 1570(Part 2Bec 1) . For some purposes. if required. Since the percentage elongation depends on the relation between the gauge length and the cross-sectional area of the test piece. that is. are given in the relevant tables of the schedule. These elongation values given are based dn a gauge length of 5*65drwhich is now internationally accepted.4 In addition. given for some of the physical conditions for inclusion in specifications. may be necessary. 7 and 8. 6 . together with the &es.of tensile’ strength. 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. Table 2 gives values for the hot-rolled or These values are based on ruling sections up to normalized conditions. the properties obtainable in the core of casehardened parts after refining and quenching. unniachined Found test pieces for small size round bars. a minimum yield stress is regarded as specification requirement and minimum yield stress values are. to which these properties are applicable are given in Tables 3 and 4. flat test pieces for thin plates. for larger size round bars and for square bars. and machined round test pieces for thicker plates. therefore. the specified percentage elongation should be’ based on the recently adopted formulae of either . of the specified composition for a particular range . Mechanical properties for cold-drawn bars and for hardened and tempered bars and forgings. elongation conversion may be obtained from IS : 3803-1974*. *Method for elongation conversions for steel (jut revision). Information on the assessment of the ruling section of bars. and forgings. or conversely. 2. forgings and parts is given in Tables 9 and 10.1979 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. for example. specified minimum values for the percentage elox?gation for the different types of test pieces are included in the schedule.5 For tensile tests on tubes.3 This schedule includes specified tensile properties applicable to the different conditions. values for the specified minimum percentage elongation -corresponding to the specified tensile ranges are included. If test pieces of other than 5*6Wxgauge length are used. sections and flat bars. for example. Table 5 gives-the properties for case-hardening steels. 2. 150 mm and for larger sizes. 7 The specified mechanical properties are applicable to test samples taken from a standard location which’ should be included in the specification. bend test.458 370490 420-500 448-520 448-548 470-570 500-600 520-620 550-650 580680 630-7 10 660-780 720 Min 720 Min 750 Min 750 Min ELONQATIO& PEBCENT. +lMPa = lN/mme = O-1020 kgf/mme.8 Any tests. etc. for example. BILLETS AND FORGINGS IN THE HOT-ROLLED OR NORMALIZED CONDITION ( Clause 2. 2. SEGTIONS.3) DESIGNATION ~_____A-__~ TENSILE STRENGTH Old (2) (3) MPa* 320-400 340-420 370.1979 TABLE 2 SPECIFIED TENSILE LIMITS FOR PLATES.‘Min New (1) 7c4 lOC4 14C6 15c4 15C8 2OC8 25C4 25C8 3OC8 35c4 35C8 4OC8 4568 5oc4 5oc13 55C8 6OC4 65C6 (4) (C07) (ClO) (Cl4) (C15) ( Cl5MnZ_5 ) (C20) ( C25 ) ( C25MnF 27 26 26 25 25 24 23 22 21 20 20 18 15 13 11 13 11 10 ) (C30) (C35) ( C35Mn7J ) (C40) (C45) (C50) ( C50Mnl) ( C55Mn75) (C60)(C65) NOTE. 2.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.IS : 1570(Part 2/Set 1) . additional to the tests given in this schedule should also be specified in the standard as appropriate. flattening tests on tube. BARS. 7 . 0) ( C55Mnz) (3) MPa+ 490 540 540 610 640 670 730 *IMPa = lN/mma = O-1020 kgf/mm% . ~Uin t 3 (10) 18 18 18 15 12 10 10 00 (1) 1oc4 15C8 2OC8 3OC8 4OC8 5oc4 55C8 (2) (ClO) (C15Mn%) (C20) (C30) (C40) (C4. iUia (8) 15 15 15 12 10 9 9 s 0-s r---7 63 mm I! Tensile Strength iuia (9) MPa* 360 430 430 490 540 590 630 Elongation f Percent.3 ] 5 DEBIQNATION cl----y New Old UP #---A---_~ Tensile Strength Min TO 20 XIim Ovm 20 mm UPTo4Omm Elongation c--hp-l Percent. Min Tensile Strength bfin (4) 11 11 10 9 8 7 7 (5) MPa@ 450 510 510 570 610 630 690 Elongation Percent.3(d) and 2.TABLE 3 SPECIFIED TENSILB LIMITS FOR COLD-DRAWN BABS [ Clauru 0. Min (6) 13 13 12 10 9 8 8 OvEa 40 mm UP TO 63 mm ‘Tensile---y “Zgth (7) MPa* 410 470 470 530 570 610 670 Elongation Percent. 102 0 kgf/mm% TABLB 5s. PERCENT. Min (4) 17 (1) lOC4 14c6 15c8 2oc8 (2) (ClO) (Cl4) (C15Mn75) (C2O) 17 17 16 55 30 llMPa = lN\mm* = O-1020 kgf/mma.IS : 1570(Part 2/Set 1) . PEWENT.3 ) DESIONATION r--> New TENSILE STWN~TH (1r Old YIRLD STREsfB Min ELONGATION. Min (II SPWI~IED) (5) Joules 55 55 55 LIXITIN~ RULING SECTION (6) mm 15 Over 15 U$F 30 DESIGNATION -&---_y r-New Old TENSILBI STSENQTE.u 2.lOO 30 63 30 (1) 3OCJ3 35C8 (2) (C3O) ( C35Mns) (3) MPae 600-750 600-750 (4) MPae rww) 400 (5) 18 18 18 17 :: 44x8 45c8 5oc4 (C5O) 700-850 800-950 46O 540 15 1s 15 13 *IMPa = lN/mmr I 0.3 ) IZOD IVPA~T VALUE. Ma LIMITING RULTN~ SECTlOlZ sPlroxrIED) (IS SFEOUIED) (6) Joules 55 55 41 35 :: (7) mm 30 63 100 30 . Min (3) MPa* 500 500 500 500 ELONGATION. 9 .~S~D~CHANICAL REFINED PROPERTIBS FOR CASE-HARDENING AND QUENCHED CONDITION ( CORE PROPERTIES ) ( Cku. Mill IZOU IMPACT VALUE.1979 TABLE 4 SPECIFIED MECHANICAL PROPERTIBS FOR BARS AND FORGINGS IN THE HARDBNBD AND TBMPERBD CONDlTION ( Claus&2. GAUQB LENQTH 50 mm (4) 28 28 25 25 (1) 7c4 1oc4 15c4 2OC8 (2) (CO71 (Cl01 (C’5) (C20) (3) MPa* 300-380 320-400 320-440 390-510 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 _--h--_-y New Old TENSILE STREFXITH Min E~~NCUTION. WIDTH 12.3 ) AND DESIGNATION T__-* ---7 New Old (1) (2) CONDITXON TENSILE STRBN~TE (4) MPa+ 390-470 470-570 570 Min (3) r Quarter hard 1x4 (Cl51 (I iZtfhard = 0. Min.1979 AND TABLE 6 SPECIFIED TENSILE LIMITS FOR MILD STEEL SHEET STRIP IN THE COLD-ROLLED AND ANNEALED CONDITION ( Clause2.5 mm. TEST PIECE. PERCENT.IS : 1570(Part 2/Set 1) .102 0 kgf/mm% llMPa = lN/mme 10 . Min (1) 14C6 15C4 15C8 Min MPa* 170 220 250 280 Min (2) MPa* 320 Mi?l MPa* (3) (4) MPa* (5) (6) (7) ( C15Mn7. 22: 31 mm (4) - (5) mm - (6) mm - (7) mm - s 40 43 46 47 48 48 48 48 :t 48 49 (3) mm ...3 ) THICKNESSOFSECTICIN ______---__L--_--_-_------_---\ 40 50 60 80 10 20 30 mm mm mm mm mm mm mm 100 mm (9) mm - 120 mm (10) mm - 140 .- 1:.~N~ATIoN ~PEIICENT. mm (11) mm DIAMETER O~EQUIVALENTROUNDS mm :x 4”: 50 (1) mm (2) 10 14 17 16 17 (3) mm . 91 z. on gauge length = 5*651/T or 2OC8 25C8 2X4 35c4 35C8 ’ (C20)-‘(C&!n!75 _> ( &-it\5 ) ) ) 1 J 370 390 440 I -!l!F 580 700 47 60 on gauge length 5OC12 45c:a ( C50Mnl (C45)_ *lMPa TABLE 520 340 = lN/mma = 0. 92 !z 117 108 125 131 136 140 145 143 148 150 :: 120 100 140 160 180 200 225 250 300 350 and over x ii 17 :: 17 17 :: 17 17 :: 32 32 3333 33 33 z 53 :: 33 87 1 130 146 148 154 l:i2 48 108 112 115 117 119 120 121 121 X X X % X X X X X X X X Greater than 160 mm.IS : 1570(Part TABLE COLD-DRAWN 2/Set 1) .3 ) COLD-DRAWN AND ANNEALED --_-m-7 Tensile Yield Strength. ! 1 J = 41/A 9 CONVERSION INTO EQUIVALENT OF OF RECTANGULAR AND SQUARE SECTIONS RULING SECTIONS.102 0 kgf/mms. Min DESIQNATI~N r-h___-) New Old ANDTEMPERED Yield Stress. 63 63 63 63 5: 63 77 77 78 :: 7788 9.1979 8 SPECIFIED -TENSILE LIMITS FOR. EI. TUBES IN THE AND ANNEALED CONDITION AND IN THE COLD-DRAWN OR COLD-DRAWN AND TEMPERED CONDITION ( Clause 2.5 ) 440 ~520 500 33 42 46 1 2. COLD-DRAWNOB COLD-DRAWN r---_-h---y Tensile Strength. OIL QUENCHING \~IDTIi SECTION ( Claw 2. 11 . Stress. 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 . 12 . mm DIAMETEB OF EQUIVALENT ROUNDS (1) mm (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 (6) mm (7) mm 03) mm (9) mm (10) (11) mm mm 122 132 140 148 154 x x x x __c 142 152 x x x x x x 10 20 30 40 50 60 80 100 120 140 160 180 200 225 250 390 350 and over 30 34 38 41 45 47 49 50 51 51 52 52 53 54 59 1w) - 1 51 55 62 68 72 76 79 81 83 85 86 88 97 61 70 76 82 86 90 93 95 98 100 104 115 81 90 98 104 109 114 117 121 125 131 152 - 45 49 54 58 62 64 66 67 68 69 70 71 78 102 111 119 126 132 137 142 147 155 X x Greater than 160 mm.IS : 157O(Part 2/Set 1) .1979 TABLE 10 CONVERSION OF RECTANGULAR AND SQUARE SECTIONS INTO EQUIVALENT RULING SECTIONS. JRules for rounding off numerical values (ret&i). NOTE If no symbol is used. symbols indicating special characteristics as fellows: 1) Method of designationDepending on whethe: the steel is killed. the following symbols shall be used to indicate the steel making practice: i) R . Details of the new designation system are given in IS : 1762 ( Part I )-1974*. STEELS DESIGNATED COMPOSITION ON THE BASIS OF CHEMICAL A-2. GENERAL A-l.grain size controlled.1979 APPENDIX ( Clause 0.rimming steel. Q2 p= freedom from flakes. The figure after multiplying shall be rounded off to the nearest integer according to the rules given in IS : 2-1960$ d) If necessary.4 ) A NEW SYSTEM OF DESIGNATION OF STEELS A-l. 2) Steel quality ..1 Unalloyed Steels ( as Defined in IS I 759&1974t ) .IS : 1570(Part 2/Set 1) . *Classification of steels. semi-killed or rimming variety. A-2. and ii) K = killed steel. b) Letter ‘ C ‘. Q4= inclusion controlled.The following symbols shall be used to indicate steel quality: Q1 = non-ageing quality.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. and c) Figure indicating 10 times the average percentage of manganese content. it shall mean that the steel is of-semi-killed type. and Q5 = internal homogeneity guaranteed. Q3 .The code designation shall consist of the following in the order given: a) Figure indicating 100 times the average percentage of carbon content. 13 . *Code for designation of steels: Part I Based on letter symbols. 035 o-050 0*070 0.Symbol * B ‘.1979 levels ( ladle 3) Degree of )wity-The sulphur and phosphorus analysis ) shall be expressed as follows: Symbol _--___A-__---. ~BO.035 0. Example: phosphorus rounded off * to the nearest = O-045 percent Maximum sulphur Maximum phosphorus = 0. For steels B.055 The above symbols use the letter ’ P ’ followed by 1000 times the maximum percentage of sulphur and phosphorus. 4) Weldability guarantee .rounding off numerical values (revtied ). the maximum sulphur rounded off * to the nearest b) 100 times &e maximum integer. B2 and B4 a test should be made with Charpy V-notch specimens. In case the maximum contents of sulphur and phosphorus are not -same. ‘ B2 ’ or x B4 ’ indicating resistance to brittle fracture based on the results of the V-notch Charpy impact test. taken in the direction of rolling with the notch perpendicular to the surface of the plate or product.by tests mutually agreed between the supplier and the manufacturer shall be indicated by the following symbols: W = fusion weldable.035 percent Designation: SP 44.055 P25 P35 P50 P70 No symbol will mean 0.Guaranteed weldability of steel as determined .025 0.025 0. and W1 = weldable by resistance welding but not fusion weldable. the following procedure shall be followed: Symbol SP shall be used to indicate the levels followed by: a) 100 times integer. 5) Resistance to brittle fracture . Maximum Content in Percent Phosphorus Sulphur 0. *Rounding off shall be done according .050 o-070 0. to the rules given in 1s : Z-1960Rules for 14 .IS : 1570(Part 2/Set 1) . ‘ BO ‘. it shall mean that the surface is in as-rolled or asforged condition. S6 = bright drawn or cold rolled. NOTE . B2 and B4 are characterized by an average Charpy impact value according to the following table: Steels S’ecijied UTS Range -------------T r__________-_h_ 500 to 700 MPa* 370 to 520 MPa* V-notch ~~~~~~-_~~ Energy (2) Temperature (3) “C 27 0 r-W----_A--. ). and D3 = extra deep drawing quality. S5 = peeled ( skinned ). S2 = descaled. grit or sand blasted. *lMPa If no symbol is used. BO. s3 = pickled ( including washing and neutralizing S4 = shot.If no symbol is used. it shall mean that the steel is of commercial = lN/mmg = 0. D2 = deep drawing quality.~ Energy (4) Temperature (5) “C 27 (1) B BO B2 B4 J 28 28 J 40 28 40 -10 0 28 28 -20 -40 28 40 28 40 symbols -30 -20 -50 -40 shall be used to 6) Surface condition .1979 Steels B.102 0 kgf/mm? 15 . and S7 = ground. ( applicable to sheet only ) - The following symbols NOTEquality.The following indicate surface condition: Sl = deseemed or scarfed.IS : 1570(Part 2/Set 1) . 7) Formability shall be used to indicate drawability: Dl = drawing quality. T13 = case-hardened*. F6 F7 F8 F9 FlO = =i = = = = bright finish. T2 = hard-drawn. T 12 =is stress-relieved. plating finish. F4 = unexposed.IS : 1570(Part 2/Set 1) . T5 = annealed. polished and coloured blue. if done. and and tempered. F3 = exposed. unpolished finish. T3 = normalized*. polished and coloured yellow. cooled. T11 = spherodized. Fll F12 = mirror finish. *Includes tempering. T14 s1 hardened NOTIC - and aged. 16 . If no symbol is used. T4 s controlled rolled. it means that the steel is hot-rolled. F13 = vitreous enamel finish. T7 = solution-treated. T8 I solution-treated T9 = controlled TlO = bright annealed.1979 symbols 8) Surface jnish ( upjdicable to sheet only) - The following shall be used to indicate the surface finish: Fl I general purpose finish. and F14 = direct annealed finish. F2 = full finish. be used to indicate T6 = patented. polished finish. 9) Treatment-The following symbols shall the treatment given to the steel: Tl = shot-peened. F5 s matt finish. 1s : 1570(Parf 2/Set 1) . Elevated temperature properties shall be intimated to the purchaser separately by the manufacturer.For guarantee with regard to elevated temperature properties. the letter ‘ H ’ shall be used.1979 10) Elevated tem#erature properties . Steel with average 0. 1 percent manganese and guaranteed fusion weldable. only the room temperature However.25 percent carbon and 0. 11) Cryogenic qualify. Examples: 21C5BO Semi-killed steel with average 0.45 percent carbon. the letter ‘ L ’ shall he used. However.For guarantee with regard to low temperature properties. in the designation properties shall be shown. 45ClOW 17 . only the room temperature properties shall be indicated in the designation.5 percent manganese content and resistance to brittle fracture grade BO. V. Calcutta SI~RI M. Ranchi DR N. SURRAMANIAN Bharat Heavy Electricals Ltd. V. R. PATHY* Bombay Iron & Steel Control. Khopoli SSllI A. ROY Bombay Mahindra Ugine Steel Co Ltd. Eubramanlanrepresecting &hi&a Uglne Steel 18 . Khopoll. Tiruchchirappalli DR G. MinistryofRailways RESEAROH DESIGNS & * STANDARDS ORQANIZATION ASSISTANT DIRECTOR ( MS ) ( Alternate ) Bhabha Atomic Research Centre. Trombay DR N. C. KONDAL Rno SHRI K. DAS ( Alferaate) Association of Indian Automobile Manufacturers. is also alternate to Shrl A. JHA ( Alternate ) JOINT DIRECTOR (MET). C. V. Psthy 00 Ltd. Ranchi S~IRI R. Srin~ A. R. DH R. K. PRAMANIE Heavy Engineering Corporation Ltd. V. BALARAMAYOORTHY ( Alternate ) Bihar Alloy Steels Ltd. VENKATARAMAN *Dr B. MOHAN Allov Steels Producers Association of India. K. K.IS : 1570(Part 2/Set 1) .1979 ( Confind from -page2 ) MtTlbnS Snxu M. Durgapur Ltd ( Durgapur Steel Snrtr R. K. DUTTA Steel Representing Authority of India Plant ). PRASAII SI~RI D. E9 Behind Mar01 Telephone Exchange. ‘Sales Office is at 5 Chowringhee CALCUTTA 700072 tSales Office is at Novelty 27 10 85 Grant Road. 14/1421. Behind . University THIRUVANANTHAPURAM NIT Building. 0. lnti . NEW DELHI 110002 ‘Eastern : l/l4 CIT Scheme VII M.Tumkur Road. No. SAHIBABAD 201010 Telephone 8-77 00 32 : Manak Bhavan. Second Institution of Engineers Floor. Nagar. C.T. 43. 1332 Shivaji Nagar. 323 3375. Sector Savitri Complex. 695034 Market. Khanpur. Sahibabad Regional Central Offlcee: 323 76 17 337 86 62 60 38 43 235 23 15 832 92 95 Industrial Area. T. Gupta Marg. 29. Gokulpat ( India ) Building. Ganga Nagar. CHANDIGARH 160022 twestern MUMBAI : C. 91113239382 110002 Telegrams : Manaksanstha (Common to ail Offices) Central Laboratory: Plot No. Sector 34-A. AHMEDABAD 380001 550 13 48 839 49 55 55 40 21 21 01 41 8-28 88 01 8-71 19 96 541137 20 10 83 37 29 25 21 68 76 23 89 23 26 23 05 6 21 17 52 51 71 32 36 35 500001 SPeenya Industrial Area. KhurJa. NEW DELHI Telephones: 323 0131.BUREAU OF INDIAN STANDARDS Heedctuartem . HYDERABAD 208005 1171418 B. GHAZIABAD 5315 Ward No. BHUBANESHWAR Buildings. KANPUR E-52. BANGALORE 560002 Frinled at NW India Printtng Press. P. BHOPAL 462003 751001 641037 121001 Plot No. R. Road. Chambers. Princep Street. Maniktola.I. *Sales Office is at ‘F’ Block. LUCKNOW 226001 Patliputra Industrial Estate. V. MUMBAI Narashimaraja 400007 309 65 28 222 39 71 Square. Unity Building.Leela Cinema. Nampally Marg. 91113239399. CO&tBATORE Road. PATNA 800013 P. Mathura . Unit VI.P. IV Cross Road. C-Scheme. 20/9. 400093 Branch Offices: ‘Pushpak’. G. 5th Floor. 40 36 27 r 116 G. NAGPUR 440010 T. CHENNAI 600113 : Manakalaya. Campus. Bangalore BANGALORE 560058 Gangotri Kalaikathir Complex. 1st Stage. Barua Road. Andheri (East). FARIDABAD 201001 Plot No. Road. Sarvodaya Seth Bhawan. 5th By-lane. 9 BahadurShah Zafar Marg. L. 9 Bahadur Shah Zafar Marg. CALCUTTA709054 -Northern Southern : SC0 335336. T Nagar. T. Nurmohamed Shaikh Marg.I. Road. Naval Kishore Road. N. Site IV. Palayam. Road. 62-63. Bhadbhada 670 Avinashi 16 A.Manak Bhavan. 0. Chitaranjan JAIPUR 302001 GUWAHATI 781003 Station Road. 323 9402 Fax :91 113234062. 5-8-58C. PUNE 411005 Approach. 2nd Floor.