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IS : 1370Indian Standard

SCHEDULES FOR WROUGHT

(Part III) - 1979( RdfImd 1993)

STEELSPART III CARBON AND CARBON-MANGANESE FREE

CUTTING STEELS

( First Revision )Sixth Reprint NOVEMBER 1998

UDC 669.14.018.232 (083.4)+669-1574-194 (083.4)

Q CopyrtglJr 1979BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAPAR MARO

NEW DELHI llCNW2

cr 5 October 1979;

( Reaffirmed 1998 )

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182 1570 ( Part III ) - a973Indian Standard

SCHEDULES FOR WROUGHT STEELSPART ill CARBON AND CARBON-MANGANESE FREECUTTING STEELS

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

ChairmanDR G. MIJ KHER~EE

MembersSHRI A. N. BISWA~SHRI S. K. BASU ( Alfcmate)SHRI B. C. BxswrsSHRI A. M. BISWAS ( Alternate )SHRI P. K. CHAERAVARTYDR T. MUKHERJEE (Allmate)Sam P.K. CHATTERJEE

Rspruaaf ingSteel Authority of India Ltd (Alloy Steels Plant ),

DurgapurGuest, Keen, Williams Ltd, HowrahNational Test House, CalcuttaThe Tata Iron & Steel Co Ltd, JamshedpurMinistry of Defence ( DGI )

SHRI P.K. GANGOPADHYAY (Altcmate)SHRI K. M. CHAUDIIVRY National Metallurgical Laboratory ( CSIR ),JamrhedpurSnaI DA%I

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IS t lS70 ( Part III ) - 1979( Con!inucdfrompage 1 )

Members RejmentingSmr S. 1~. Kri~ns Indian Register of Shipping, BombaySHRI V. N. PANDAY ( Altmat~)SHRI R. S. KOTHAWALE Bharat Forge Co Ltd, Mundhwa, PuneSHRI S. S. LAKKIJNDI AitsrnatrDR D.P. I.AHIIU Ministry of Defence ( R & D)

SBRI I. N. BHATIA ( Altematr)SI~RI K. N. MEHRA Heavy Engineering Corporation Ltd, RanchiSWRI D. K. DAS ( Alternate)SHRI L. MISHRA Directorate General of Technical Development,New DelhiSHRI M. K. BANERJEE( Alternafa)SHRI A. PADMANABHAN A&ok Leyland Ltd, MadrmSHRI I. M. PAX Firth India Steel Co Ltd. ThaneSHRI B. M. Par ( AI&MLUDa R. V. PATTY Mahindra Ugine Steel Co Ltd. Bombay; and AlloySteel Producen Association of Indra, BombaySHRI R. NARAYANA Altmnufr )SHRI M. K. PRAMANIK Mahindra Ugine Steel Co Ltd, BombayIron & Steel Control, Calcutta&RI S. S. Sa~r ( Altnnak )DR V. RAMASWAMY Research & Development Centre for Iron andSteel I HSL ), Ranchi. ..HRI S. R. MF~IRATTA ( Ahmale )SH~I M. RANOASHAI Hindustan Machine Tools Ltd, Bangalore.SHRI SANJITSEN ( l&ma& I )SHRI P. RAMAPBASA~ ( Al&mafr II )SEBI b. K. RDY The Tata Engineerihg end Locomotive CO Ltd,JamrhedpurDE S. K. MONDAL Al!nmfs)SERI D. SRINXVABAN Steel Furnace Association of India, CalcuttaDR S. K. CHATTEBJEE ( ltmak )Smu Y. C. SUBBAHMANYA Ministry of Defence ( DGOF )SERI K. S. VAIDYANATEAN M. N. Destur h Co Pvt Ltd, CalcuttaSARI C. J. DAVE ( AI&n& )SHRI C. R. RAMA RAO,Director ( Strut & Met) Director General, IS1 ( Ex-e&c Mrmbn )

SEBI VIJAY Ku-Aeeietant Director ( Metal8 ), ISI

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

ConuaurSEBfP.K. CLCAKBAVAETY The Tata Iron & Steel Co Ltd, JamrhedpurM#hTJ

Sarrx S. K. BAEV Gust, Keen, Williams Ltd, HowrahSasrP.K. CEATTEBJEE Minirtry of Defence ( DGI )S=xM.K.Smr (A&em&) ( amtimed on fige 17 )2

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IS I 1570 Part III ) - 1979Indian Standard

SCHEDULES FOR WROUGHT STEELS IPART III CARBON AND CARBON-MANGANESE FREECUTTING STEELS

( First Revision) I0. FOREWORD

0.1 This Indian Standard ( Part III ) ( First Revision ) was adopted bythe Indian Standards Institution on 5 March 1979, after the draftfinalized by the Alloy Steels and Special Steels Sectional Committee hadbeen approved by the Structural and Metals Division Council.0.2 Schedules for wrought steels for general engineering purposes( IS : 1570-1961 ) was first published in 1961. On the basis of theexperience gained in the production and use of steels, the SectionalCommittee has decided to revise the standard and issue it in parts. Theother parts of the standard are as follows:

Part I Steels specified by tensile and/or yield propertiesPart II Carbon steels ( unalloyed steels )Part IV Alloy steels ( excluding stainless and heat-resisting steels )Part V Stainless and heat-resisting steels*Part VI Tool steels

0.3 The following major modifications have been made in this revision:a) Steel designations have been modified in accordance with

IS : 1762 (Part I )-1974tb) Change in carbon content of grade 13S25c) Change in mechanical properties of grad& 4OS18 and 4OMn2S12.

0.4 The method for designating free cutting rteels is detailed in AppendixA for information.

*Already publthed u IS : 1570 ( Put V )-1972.t&de for designation of StecL: Put I Bared on letter rymbolr.3

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0.5 For the purpose of deciding whether a particular requirement of thisstandard is complied with, the final value, observed 0; calculated, express-ing the result of a test, shall be rounded off in accordance with IS : 2_1960*.The number of significant places retained ih the rounded off value shouldbe the same as that of the specified value in this standard,1. SCOPE1.1 This schedule ( Part III ) is applicable to standards for carbon andcarbon-manganese free cutting steels supplied to a specified composition( see Table 1 ).

TABLE 1 SPECIFIED CHEMICAL COMPOSITION FOR THESTANDARD STEELSC Si IUn S PPERCENT PEzCENT PEBCENT PERCENT PEBCENT

* New(1)

10c8s1014cl4Sl425Cl2Sl44OClOSl81 ClOS254ocl5s12

Old Y(2) (3) (4) (5) (6) (7)

( lOSl1) 0.15 Max 0.05.0.30 0*60.090 O-08.0*13 0.060 Max( 14MnlSl4) O*lO-0.18 0.05.0.30 1*20.1*50 0.10.0.18 OQ60 Max(25MnlSl4 ) 0.20-0.30 0.25 Max 1*00-l-50 0.10.0.18 0.060 Mu

-4OSl8_) 0.35-0-45 0.25 MUX 0.80.1.20 0.14-0.22 0.060 Max(llS2_5) 0.08-0.15 0.10 &fax 0.80.1.20 0.20.&30 0.060 MOX(4OMn2SJz) 0.35.0.45 0.25 Max l-30.1.70 098-0.15 0960 Mar

NOTE 1 The steel may be sup lied in killed or semi-killed type. In case ofkilled steel, minimum silicon level IRould be 0.10 percent.NOTE 2elements. -When required lead and other elements are specified ar added

2. GENERAL2.1 While preparing Indian Standards, or revising the existing standards,steels listed in this schedule shall be selected. The specification of mecha-nical properties different from those given in this schedule should not bemade 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 Steel8Sectional Committee, SMDC 19, and its approval obtained.

*Rules for rounding off numerical values ( rmirrd).

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1s : . 15fO(Part IQ) - 19792.2 In addition to defining the composition limits, the specified mechani-cal properties applicable to the different conditions are included. Table 2gives values for the hot-rolled or normalized condition based on rulingsections up to 150 mm and for larger sizes some adjustment of the specifiedtensile range for a particular range of composition may be necessary.Mechanical properties for cold-drawn bars, and,for hardened and tempe-red bars and forgings, together with the sizes to which these propertiesare applicable are given in Tables 3 and 4. Table 5 gives the propertiesfor case-hardening steels, that is, the properties obtainable in the core ofthe case-hardened parts after refining and quenching.

TABLE 2 SPECIFIED TENSILE LIMITS FOR BARS, BILLETSAND FORGINGS IN THE HOT ROLLED ORNORMALIZED CONDITIONDESIONATION TENSILE STREXDTH ELONOATION, PEIICENT,r___--h--_--~ MltlNew Old Gauge Length

(1) (2) (3) (4)MPa*loc8sIo ( 10511) 370-450 2414C14Sl4 ( 14hInlSE) 440-540 2225ClZS14 (25MnlSE) 500-600 204OClOS18 (4oSlZ) 550-650 171 lClOS25 (llS25) 370-490 224OC15512 ( 4OMn2S I2 ) 600-700 15-

KOTE - Minimum values for yield stress may be rrquired in certain specilica-tions and in such cases a minimum yield stress of 55 percent of the minimrrmtensile strength should be satisfactory.l MPa = IN/mm8 = 0.102 0 kgf/mma.

2.3 For some purposes, a minimum yield stress is regarded as a specifica-tion requirement and minimum yield stress values are, therefore, given forsome of the physical conditions for inclusion in specifications, if required.2.4 Information on the assessment of the ruling section of bars, forgingsand parts is given in Appendix B.2.5 In addition to the tensile ranges, values for the specified minimumpercentage elongation corresponding to the specified tensile ranges areincluded in the Schedule. Different types of test pieces are used for thetensile test. The values given in this schedule are based on a gau.ge lengthof 5.65 dxand if test pieces of other than 5.65 1/xgauge length areused elongation conversion may be obtained from IS : 3803-1974..

*Elongation conversions for rteel (Jrsf rruirion ).5

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tifYm8

ATABLES SPEU?IEDX7WSILEWMIT8FORCOLDDMWNMRS

( claus 2.2 )

Old Tenrile Elongation.

(1) (2)0, 1oaBlO (10s~ )

14O14Sw ( 14MalSf~25Cl2!314 (25IWSl~)-10 ( 4oqllCloS25 ( 1182j)4ocwSl2 ( 4oha2S12 )

(9bfw5005s620640500600

10108887

TentileSwMzth.

(5)MPa460520560600440640

10111010118

TensileYzlfths

(7)MP8420460520560UM620

(8)131211111310

(9)MP8.310440500550370600

01 MPa - 1 N/mm* I @lo20 kgf/mm&

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IS I 1570 ( Part III ) - 1979

TABLE 4 SPECIFIED MECHANICAL PROPERTIES FOR BARS ANDFORGINGS IN THE HARDENED AND TEMPERED CONDITION( Clause 2.2 )

DEM~NATION TENSILE YlrnL0 ELONOATI~N Imn I.ibf1T1~0~-.--A---- ---, STI~ENOTIi STm?Sl3,New Old PERCENT, IMPACT RULINGMin Min SECTION(if specified) GAUQE VALUE,Min ( ifLENOTE specified )

(1) (2) (3) (4) (5) (6) (7)MPIl, MPa* J mm4OClOS18 ( 4OS18 ) 600-750 380700-850 480 18 ;1 6017 35 30

600-750 4204OC15S12 (4OMn2S12) i 700-850 500- 800-950 560l MPa = 1 N/mm2 CT0*1020 kgf/mmr.

18 48 100Is8 :Y 6030

TABLE 5 SPECIFIED MECHANICAL PROPERTIES FOR CASEHARDIbNING STEELS IN THE REFINED AND QUENCHEDCONDITION ( CORE PROPERTIES )( Clause 2.2 )

DEEIONATION TENSILE ELONQATION,FNZ

---A--y STRENGTE PERCENT, IUD IXP$~T VALUE, LIMITINGRULINOOld Min ( if specified ) SECTIONGauge Length

(1) (2) (3) (4) (5) (6)MPa* J mm10c8s10 ( IOSll ) 500 17 55 30lOC14S14 ( 14M:lSlJ ) 600 17 41 30-l MPa = 1 N/mma = O-102 0 kgf/mm?

2.6 The notch toughness of steels after hardening end tempering issometimes assessed by an impact test and values for incorporation inspecifications, if required, are given in the relevant tables of the schedule.2.7 The specified mechanical properties are applicable to test ramplotaken from a standard location which should be included in the speci-fication.2.6 Any additional tests apart from those given in this schedule, shouldalso be specified in the standard as appropriate.

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IS: 1570 ( Part III ) - 1979APPENDIX A

( Cluusc 0.4 )NEW SYSTEM OF DESIGNATION OF STEELS

A-l. GENERALA-l.1 The new system of designation of steel is based on the draft IS0proposal submitted by India to ISO/TC 17 Steel for for~~ulation of aninternational standard. Details of the new designation system are givenin IS: 1762 (Part I)-1974*.A-2. STEELS DESIGNATED ON THE BASIS OF CHEMZCALCOMPOSITIONA-2.1 Unalloyed Free-Cutting-Steels - The designation shall consistOf:

a)b)4d)

Figure indicating 100 times the average percentage of carbon;Letter C ;Figure indicating 10 times the average percentage of manganese;Symbol ( S , S, , T, or Pb depending on the elementpresent which makes the steel free-cutting fo!lowed by the figureindicating 100 times the percentage content of the element. Inthe case of the phosphorized steels the symbol P shall beincluded; and

e) If necessary, symbols indicating special characteristics as follows:1. Method of designation - Depending on whether the &eel iskilled, semi-killed or rimming variety, the following symbolsshall be used to indicate the steel making prxtice:i) R = rimming steel, andii) K = killed steel.NOTE - If no symbol is used, it rhall mean tbat the steel is of semi-killed

tYP=.2. Steel quality - The following symbols shall be used to indicate

steel quality:= Non-ageing quality,

= Inclusion controlled, &rdI Internal homogeneity guaranteed.*Code for designation of rteel: Part I Based on letter symbols (jirrt rmiriiw).

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28 t 1579 Part III ) - 19793. Degree of purity - The sulphur and phosphorus levels ( ladleanalysis ) shall be expressed as follows:

Symbol Maximum Content in Percent~_~_~____~~h-~~~~---~Phosphorus Sulphur

P2.5 0.025 0.025P35 0.035 0.035

- P50 0.050 0.050P70 0.070 0*050No symbol will mean 0.055 0.055The above symbols use the letter P followed by 1CO 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 5 O-045 percentMaximum phosphorus c 0;035 percent

Designation: SP 44.4. Weldability guarantee - Guaranteed weldability of steel asdetermined by tests mutually agreed between the purchaserand the manufacturer shall be indicated by the followingsymbols:

W = Fusion weldable, andbV, = Weldable by resistance welding but not fusionweldable.

5. Resistance to brittle fracture - Symbols B , * BO , B2 or B4 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 notch perpen-dicular to the surface of the plate or product.

*Rounding off shall be done according to the ruler given in IS : 2-1960 Ruler forrounding offnumerical valuer (r&ed).9

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1s 1 570 art III ) - 1979Steels B, BO, B2 and B4 are characterized by an average V-notchCharpy impact value according to the following table:

Steels

(1)

SpeciJed UTS Rangec------------ A-_--_--~--~__--~370 to 520 MPa* 500 to 700 MPa*~------- ----7 c-------~Energy Temperature Energy Temperature

(2) (3) (4)J "C J

28 27 4028 0 284028 -20 28

4028 -40 $0

(5)C27

-10 0-30-20-50-40

BBOB2B4

6. Surface Condition - The following symbols shall be used toindicate surface condition:Sl = Deseemed 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 m Ground.

NOTE If no symbol is used, it ahall mean that the surface is in as-rolled oru-forged condition.7. Formability ( uj@hble to sheet orto ) - The following symbolsshall be used to indicate drawability:

Dl P Drawing quality,D2 P Deep drawing quality, andD3 I Extra deep drawing quality.

NOTE If no symbol is used, it aball mean that the steel is of ordinary quditp.+1 MPa - 1 N/mm* = O-1020 kgf/mm%

IO

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8. Surface finish ( afl$dicable to sheet or@) - The following symbolsshall be used to indicate the surface finish:Fl = General purpose finish,F2 = Full finish,F3 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,F12 = Mirror finish,F13 - Vitreous enamel finish, andF14 = Direct annealed finish.

9. Treatment - The.following symbols shall be used to indicatethe treatment given to the steel:Tl - Shot-peened,T2 - Hard-drawn,T3 I Normalized*,T4 = Controlled rolled,T5 = Annealed,T6 = Patented,T7 P Solution-treated,T8 - Solution-treated and aged,T9 =: Controlled cooled,

TlO = Bright annealed,Tll = Spherodixed,T12 - Stress-relieved,T13 = Case-hardened*, andT14 = Hardened and tempered.

Noxx - If no rynhol is used, it means that the steel is hot-rolled.*Including tempering if done.

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IS I 1570 ( Part III ) - 197910. Elevated temperature properties - For guarantee with regard toelevated temperature propertics, the letter H shall be used.However. in the designation only the room temperatureproperties shall be shown. Elevated temperature properties

shall be intimated to the purchaser separately by the manu-facturer.11. Cryogenic quality - For guarantee with regard to low tempe-rature properties, the letter L shall be used. However,only the room temperature properties shall be indicated in thedesignation.

Examples:35ClOSl4K Free-cutting steel with average 0.35 percent carbon,1 percent manganese and O-14 percent sulphur,killed quality.20Cl2Pbl5T14 Free-cutting steel with average 0.15 percent lead,0 20 percent carbon and 1.2 percent manganese,hardened and tempered.

A-2.2 Free Cutting Alloy Steels - The steel designation shall be asfor low, medium and high alloy steels as given in IS : 1762 ( Part I )-1974*except that depending on the percentage of S, Se, Te, and Zr present, thedesignation shall also consist of the chemical symbol of the element presentfollowed by the figure indicating 100 times its content.Examples:

Xl5Cr25Nil5S40 Alloy free-cutting steel with carbon O-15 percent,chromium 25 percent,sulphut 0.40 percent. nickel 15 percent andXl2Crl8Ni3S25 Alloy free-cutting steel with 1G percent chromiumnickel 3 percent and sulphur 0.25 percent;

*Code for designation of steel: Part I Based on letter symbols (Jrsr rmitiom .12

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I8 t 1570 ( Part III ) - 1979APPENDIX B

( Clause 2.4 )INFORMATION ON RULING SECTION

El. The mechanical properties obtained from a steel of a given composi-tion are fundamentally influenced by the speed of cooling from a tempera-ture above the upper critical point, that is, from the hardening ornormalizing temperature. Also .for a given method of cooling, for example,oil-quenching, the rate of cooling is strongly affected by the size andshape of the part being treated. Therefore, for a steel of a given composi-tion, the mechanical properties attained are affected not only by themethod of cooling employed, but also by the size and shape of part at thetime of heat treatment. Thus, although it may be possible to obtaineffective hardening by oil-quenching a small section of a steel of a parti-cular composition, it may not be possible to produce satisfactory hardeningthroughout the mass when parts of larger cross-sectional dimensions areoil-quenched. In such circumstances a steel of a different composition hasto be selected. This inter-relation between the mechanical propertiesobtained and the size and shape of the part at the time of heat treatmentis sometiTles referred to as mass effect :B-2. It is, therefore, necessary, when selecting the steel which should beused to attain certain specitied mechanical properties after heat treat-ment, to know the size and shape of the part to be. heat-treated. Thecross-sectional dimensions of that portion of the forging or part, where itis most important to obtain the desired mechanical properties, areregarded as the ruling sections of the part. In the case of round bar,the diameters is the ruling section, but, as many shapes other than roundbars require heat treatment, it is desirable to, be able to relate the rates ofcooling of other shapes to their equivalent sections of round bar. Thediameters of round bars, the centres of which would cool through a giventemperature range at the same rate as the centres of rectangular andsquare bars of selected sizes have been assessed and the restiltinga equivalent ruling rections are given in Tables 6 and 7. Table 6 givesthe equivalent ruling section in terms of diameter of round bar forrectangular and square sections when oilquenched,*while Table 7 givesthe same information for air-cooling. As examples of how the tables maybe applied, the centre of a square section of 100 mm sides will, when oil-quenched, cool at the same rate as a round section of 108 mm diameterand the equivalent ruling section of a slab 140 mm wide x 60 mm thickwill, for oilquenching, be 88 mm. In the ease of other regular sections,close approximations may usually be made since the order of decreasing

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ISr1570 (Pa&III)-1979rate of cooling is, round, octagonal, hexagonal and square, while ovalsections with major axis a and minor axis 6 will cool more dowly than around bar of diameter b but faster than u rectangle u x b.

TABLE 6 CONVERSION OF RECTANGULAR AND SQUARE SECTXONSINTO EQUIVALENT RULING SECTIONS, OIL QUENCHING( C~JU 2.4, B-2 )

WIDTHor Tmorwrnl or S~OTIOYSIBOTIONy pr--- --A---L 320 30 40 50 60 80 100 120 140mm mm mm mm mm mm mm mm mm mmr----- ?DIAMETBBOY EQUIVAL~~ ROUND@

(1) (2)mm mm10 10

20 1430 1640 1750 1760 1780 17

100 17120 17140 17160 17180 17200 17225 17250 17300 17350 and over 18

(3) (4) (5) (6)mm mm mm mma - - -21 - - -26 32. - -29 37 43 -31 40 48 5432 43 51 5932 46 57 6633 47 60 7133 48 62 7433 48 63 7633 48 63 7733 48 63 7733 48 63 7833 48 63 7833 48 63 7833 48 63 7833 49 63 78

(7) (8) (9)mm mm mm

-65 - -74 87 -80 96 10885 102 11788 108 12590 112 13191 115 13692 117 14092 119 I4392 120 14592 121 14892 121 150

(10) (11)mm mm

-

130 -140 152148 x154 x

X XX XX. XX XX. X

x Greater than 160 mm.

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Is : 1570 ( Part III ) - 1979

TABLE 7 CONVERSION OF RECTANGULAR AND SQUARE SECTIONSINTO EQUIVALENT RULI NG SECTIONS, AIR COOLING( Cfawes 2.4, B-2 )

WIDTH 01 THICKNESS OF SECTIONSECrION -F------- --_*------__-_-__--~10 20 30 40 50 60 80 100 120 140mm mm mm mm mm mm mm mm mm mm

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

10 10 - - - -20 13 20 - - -30 15 24 30 - -40 16 27 34 40 -50 16 29 38 45 5160 17 30 41 49 5580 17 32 45 54 62

100 17 33 47 58 68120 17 34 49 62 72140 17 34 50 64 76160 17 34 51 66 79180 18 35 51 67 81200 18 35 52 68 83225 18 35 52 69 85250 18 36 53 70 86300 18 37 54 71 88350 and over 20 39 59 78 97

>c Greater than 160 mm.

(7) (8) (9)mm mm mm- -

- --- --617076828690939598

100104115

-81 -90 10298 111

104 119109 126114 132117 137121 142125 147131 155152 X

(10)mm----

-122132140148154XXXX

(11)mni------

142152XXXXXX

B-3. In the case of parts of nonuniform section, not only is it necessaryto consider which is the most important portion of the forging in whichthe specified properties are essential, but also to consider the relation ofthe length of any enlarged portion to its diameter. For example, in thecase of aforging with a barrel, the length L of which is greater than thediameter D ( see Fig. 1A ), this diameter will be the ruling dimension.In the case of a collar, the diameter Dr of which is greater than thethickness I ( see Fig. 1B ), the collar may be considered as a disc of whichthe thickness is the governing dimension although the ruling section of thepart as a whole for practical purposes will be the diameter Dz. For

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forgings where the dimension B and thickness I of the portion of largestcross sectiori are similar ( see Fig. 1C ), the dimension A, between thecentre and the nearest .points of the external surface will in generaldetermine the ruling section.

ISI ICFIO. 1 TYPICAL DIAGRAMFORTHE ASSESSMENT FRULING SECTION

B-4. In Table 4, which gives the mechanical properties for steels in thehardened and tempered condition, are included .the limiting rulingsections, that is, the maximum diameter of round bar to which the specifiedproperties apply after hardening and tempering. For example, in the caseof steel 4OClOS18 ( 4OS18 ) 4 he properties associated with a tensilestrength of 700-800 MPa*be obtained in round bar up to 100 mm mdiameter or in other shapes whose equivalent ruling sections do not exceedthat dimension, but for a tensile strength of 800-950 MPa*, the limitingruling section is 63 mm, Therefore, to obtain a tensile strength 800-900MPa* in parts with ruling sections greater than 63 mm other steels, suchas 35Mn2Moz or 40CrlMo28 would be necessary. The application ofthe different steels given in Table 6 or different tensile ranges in relationto the limiting ruling section is summarized in Table 7.

l MPa - 1 N/md - O-102 kgf/md.16

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IS t 1570 ( Part III ) m. 979( Cbarinuedrompast2 )

M6dtlS , Rtjmwnf ingSARI M. K. DUTTA Steel Authority of India Ltd ( Durgapur Steel

SEW R. C. JHA ( Af~annk) Plant ), DurgapurJ OINT DIXECTO~ (MET), MinistryofRailwaysREBEARCH DESIGNS &STANDARDS ORGANIZATIONASSISTANT DIRECTOR ( MS ) ( Alfmtofs )Da N. KONDAL Rko Bhabha Atomic Research Centre, TrombaySHRI K. BALARAYAYOORTEY ( Altmatr )Dn N. MORAN Bihar Alloy Steels Ltd. RanchiDR R. V. PATHY* A~Io~~~;;~ Producers -Association of India,SHRI M. K. PRAMANIX Iron & Steel Control, CalcuttaSERI R. C. PRA~AD Heavy Engineering Corporation Ltd, RanchiSHRI D. K. DAS ( Altmatr )SH~I A. K. ROY Association of Indian Automobile Manufacturers,BombaySARI A. R. V. SUBRAMANIAN Mahindra Ugine Steel Co Ltd. KhopoliDR G. VENXATARAXAN Bharat Heavy Electricals Ltd, Tiruchchirappalli

l r E. V. PsWy Is also alternste to 811rlA. It. V. Babramanlmreprcsentin~ iblndrr U~lne SLselCo Ltd. Khopoll.17

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BUREAU OF INDIAN STANDARDSHeadquarters:Manak Bhavan, 9 Bahadur Shah Zafar Marg, NEW DELHI 110002Telephones: 323 0131,323 3375,323 9402Fax : 91 11 3234062,91 11 3239399, 91 11 3239382Central Laboratory :Plot No. 20/9, Site IV, Sahibabad Industrial Area, Sahibabad 201010Regional OMces:

Telegrams : Manaksanstha(Common to all Offices.)

Telephone8-77 00 32

Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg, NEW DELHI 110002 32376 17*Eastern : l/14 CIT Scheme VII M, V.I.P. Road, Maniktola, CALCUTTA 700054 337 86 62Northern : SC0 335-336, Sector 34-A, CHANDIGARH 160022 60 38 43Southern : C.I.T. Campus, IV Cross Road, CHENNAI 600113 23523 15twestern : Manakalaya, E9, Behind Mar01 Telephone Exchange, Andheri (East), 832 92 95

MUMBAI 400093Branch Offices::Pushpak, Nurmohamed Shaikh Marg, Khanpur, AHMEDABAD 380001 5501348SPeenya Industrial Area, 1 st Stage, Bangalore-Tumkur Road,BANGALORE 560058 839 49 55Gangotri Complex, 5th Floor, Bhadbhada Road, T.T. Nagar, BHOPAL 462003 55 40 21Plot No. 62-63, Unit VI, Ganga Nagar, BHUBANESHWAR 751001 40 36 27Kalaikathir Buildings, 670 Avinashi Road, COIMBATORE 641037 21 01 41Plot No. 43, Sector 16 A, Mathura Road, FARIDABAD 121001 8-28 88 01Savitri Complex, 116 G.T. Road, GHAZIABAD 201001 8-71 199853/5 Ward No.29, R.G. Barua Road, 5th By-lane, GUWAHATI 781003 54 11 375-8-56C, L.N. Gupta Marg, Nampally Station Road, HYDERABAD 500001 201083E-52, Chitaranjan Marg, C-Scheme, JAIPUR 302001 37 29 251171418 B, Sarvodaya Nagar, KANPUR 208005 21 68 76Seth Bhawan, 2nd floor, Behind Leela Cinema, Naval Kishore Road, 23 89 23

LUCKNOW 226001NIT Building, Second Floor, Gokulpat Market, NAGPUR 440010 52 51 71Patliputra Industrial Estate, PATNA 800013 262305Institution of Engineers (India) Building 1332 Shivaji Nagar, PUNE 411005 32 36 35T.C. No. 14/l 421, University P. 0. Palayam, THIRUVANANI-IAPURAM 695034 621 17

*Sales Office is at 5 Chowringhee Approach, P.O. Princep Street, 271085. CALCUTTA 700072YSales Dffice is at Novelty Chambers, Grant Road, MUMBAI 400007wales Dffice is at F Block, Unity Building, Narashimaraja Square,BANGALORE 560002

309 65 28222 39 71

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