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Disclosure to Promote the Right To Information

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

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

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Knowledge is such a treasure which cannot be stolen

IS 1570-4 (1988): Schedules for wrought steels, Part 4:

Alloy steels (Alloy constructional and spring steels) with

specified chemical composition andd mechanical properties

[MTD 16: Alloy Steels and Forgings]

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,

I nd ian StandardSCHEDULESFOR WROUGHT

IS:1570(Part4)-1988( Reaffirmed 1995 )

STEELSPART 4 ALLOY STEELS ( ALLOY CONSTRUCTIONAL AND SPRING STEELS ) WITH

SPECIFIED CHEMICAL COMPOSITION AND RELATED MECHANICALPROPERTIES

(First Revision)Second Reprint J UNE 1998

UDC 669.15.0X29-194+669.14.018.27 (083.4)

0 Copyright 1990BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARGNEW DELHI 110002

Gr6 January 1990

(Reaffirmed 2001)

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IndianSCHEDULES FOR

StandardIS : 1570 ( Part 4 ) - 1988

WROUGHT STEELSPART 4 ALLOY STEELS ( ALLOY CONSTRUCTIONAL AND SPRING STEELS ) WITHSPECIFIED CHEMICAL COMPOSITION AND RELATED MECHANICAL

PROPERTIES( Fi rst Rev i si on0. FOREWORD

0.1 This Indian Standard (Part 4) (First Revision)was adopted by the Bureau of Indian Standardson 20 June 1988, after the draft hnalized by the.411oy Steels and Special Steels Sectional Com-mittee had been approved by the Structural andMetals Division Council.0.2 This standard was first published in 1961.On the basis of the experience gained in theproduction and the use of steels, the SectionalCommittee has decided to revise the standardand issue it in parts. The other parts of thisstandard are as follows:

Part 1 Steels specified by tensile and/or yieldpropertiesPart 2 Carbon steels ( unalloyed steels )

Part 3

Section 1 Wrought products ( otherthan wires) with specifiedchemical composition andrelated propertiesSection 2 Carbon steel wires withrelated propertiesCarbon and carbon manganese freecutting steels

Part 5Part 6Part 7

Stainless and heat-resisting steelsTool steelsCreep resisting steels

0.3 The following major modifications havebeen made in this revision:a) Steel designations have been modified inaccordance with IS : 1762 ( Part 1 )-1974*.However, for the sake of easy identification,old designations are also given within* *9

Panel given below have not been includedin Table 1, and will form a separate part:1) 4OCr5Mo60 (4OCrlMo60),2) 15Cr9Mo6 (15Cr9OMo55),3) lOCr9MolO (IOCRMol), and4) 15CrNi6.

c) The following boron steels have beenadded as their use and production hascommenced in the country:1) 18ClOBT2) 35C8BT3) 21ClOBT4) 26ClOBT5) 34C14BT6) 38Cr4Mn2BT

d) The following additional grades of steelshave also been added:1) 6OSi7 71 since these are alread2) 65Si7 ) included in IS : 3195-1982x13) 6OCr4V2 J and IS : 3431-198274) 30Cr4Mo2

5) 42Cr6V 18

because of its extensive usagein automobile and aircraftindustry and comparativelybetter hardenabilitybecause of its better harden-ability and lower cost

6) 15Ni13Cr3Mo2 equivalent to EN 36included in lieu of15Ni4Crl which hasbeen deletedbrackets.The steels rationalized by the Indian Creep *Specification for steel for the manufacture of voluteand hdical springs (for railway rolling stock ) ( secondrevtswn )

*code for designation of steels: Part 1 Based on letter tspecification for steel for manufacture of volute,symbols ( first revision ). helical and laminated springs for automotive suspension( second revision 1.1

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IS : 1570 ( Part 4) - 19887) 16Ni6Cr7Mo3 equivalent to DIN grade 0.4 This schedule does not give limits for sulphur17CrNiMo6 and phosphorus. These have to be specified in8) 20Ni7Cr2Mo2 equivalent to AISI 4320. the detailed specifications.

1. SCOPE1.1 This standard ( Part 4 ) is applicable to alloyconstructional and spring steels supplied to aspecified composition as given in Table 1.2. GENERAL2.1 Whilepreparing Indian Standards, or revisingthe existing standards, steels listed in this scheduleshall be selected. The specification of mechanicalproperties different fromthose given in this scheduleshould not be made unless special conditions ofservice render this essential. In that event, fullreasons for proposed departure from the steelsspecified in this schedule shall be submitted tothe Alloy Steels and Special, Steels SectionalCommittee (SMDC 19), and its approval obtained.2.2 Many alloy steels, such as those for generalconstructional purposes, are selected on the basis oftensile strength obtained after a specified heattreatment, but in some applications, for example,..vhen the. steel is subjected in service to conditionswhere creep becomes operative, the basis of selec-tion will be the properties of steel under operatingconditions. In such cases, however, tensile testsare usually specified as an assessment of the generalquality of the material.2.3 Steels containing about 1.5 percent manganeseare used in the form of plates, sections, bars andforgings in the hot rolled or normalized conditionand the tensile properties of these steels, based onruling section up to 150 mm, are included inTable 2. For larger sizes, some adjustment ofthe specified tensile range for a particular rangeof composition may be necessary. Details for1.5 percent manganese steels in the form of colddrawn bar, together with the sizes to which theseproperties are applicabIe as given in Table 3.2.4 Alloy steels with medium carbon contentsare used for general constructional purposes andare usually hardened and tempered to a tensilestrength level appropriate to the duty involved.

The composition of the steel selected dependson the tensile strength required and the size ofthe ruling section of the part at the time of heattreatment. Thus for the same specified tensilestrength, it may be necessary to use different steelsfor different parts according to the size of theparts at the time of heat treatment . The mecha-nical properties of those steels in the hardenedand tempered condition in relation to differentruling sections are given in Table 4. This table.in some cases, includes more than one steelcapable of giving in a particular ruling sectionthe same specified range of tensile strength: for

example, both steel 35Mn6Mo3 and 4ONi14 willgive a tensile strength of 790 to 940 MPa in rulingsection up to 100 mm. This allows some degreeof interchangeability but unless special factorsare involved, the specified steel should be thatgiving maximum economy in alloy content. Therelationship of the tensile strength of steels inTable 4to the limiting ruling sections is summarizedin Table 5. Information on the assessment of theruling section of bars and forgings is given inTables 6 and 7.2.5 Steel 55Cr3 is used for the purposes whereresistance to wear is a factor and details for thissteels are specified in Table 8.2.6 For case hardened parts requiring highercore strengths than can normally be obtainedwith a carbon case hardening steel, low carbonalloy steels are required and minimum core strengthsspecified after hardening are given in Table 9.These are based on heat treatment of test samplesof 30 mm diameter except for the steels with aminimum specified tensile strength of 1 090 MPawhich are based on heat treatment of samplesmachined to a test piece size. In this table also,more than one steel is included for a particularminimum core strength but here also due consi-deration should be given to maximum alloyeconomy, when specifying the steel.2.7 Some of the steels are used in the form ofsheets, strips and tubes, and the tensile propertiesfor these are included in Tables 10 and 11. Differenttypes of test pieces are used for tensile tests depend-ing on the form of the materials, for example, flattest pieces for thin plates, sections and flat bars,unmachined round test pieces for small size roundbars; and machined round test pieces for thickerplates. for Jarger size round bars and for squarebars and forgings.2.8 For tensiJe test on tubes, the specified percent-age elongation should be based on the formulaeof 950 MPa divided by the actual tensiJe strengthkgf/mm2 when using a gauge length equivaJentto 5.654;?:2.9 The specified mechanical properties arcapplicable to test samples taken from astandard location which should be included in thespecification.2.10 Any test such as bend test: flattening teston tubes. etc, in addition to the tests given in thisschedule should also be specified in the standardas appropriate.2.11 Hardenability value:, for Boron steels arcgiven in Table 12.

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DE.WNATION*I

TABLE 1 SPECIFIE D CHEMICAL COMPOGTION FOR STANDARD STEEL(Clause 1.1 )

ChBitCAL COMP~ITI~N, PERCENTh 7

(I)36Si755Si7

c(2)0~33-0400.50-0.60

1.50-2 .OO 0.80-l .oo1*50-2.00 0 *SO-l *OO

MO(7)--

65Si7 0.60-0.70 1.50-2 .OO 0.80-l .OO6OSi7 0.55-0.65 l-50-2 *oo 0.80-l -00llC15 0.16. iUux 0 *10-O35 1.30-l *702oc15 0.16-0.24 0.10-0.35 1.30-l .70

-- ---

27Cl5 022-0.32 0.10-0.35 1.30-l *701.30-l .70

- - -37c15 0.32-0.42 0.10-0.35 - -

w47c1535Mn6Mo3

0.42-0.50 0.10-0.35 1.30-l .700.30-0.40 0.10-0.35 1.30-l .80

- -- -0.20-0.3535Mn6Mo4 0.30-0.40 0.10-0.35 1.30-l .80lOMo6 0.15, Max 0.15-0.25 0.40-0.7020Mo6 O-15-0.25 0.15-0.35 0.40-0.7033Mo6 0.25-0.40 0.10-O .35 0~40-0*7015Cr3 0.12-0.18 0.15-0.35 0.40-O %O

0.30, Ma x0.30, Max0 *30, Max-

- 0.35-0.550.25, Max 0.45-O .650 *25, Max 0.45-0.650 *25, Max 0.45-0.650.50-0.80 -

16MnSCr4 0.14-0.19 1.00-l .30 0~80-1~10 -2OMnSCr5 0.17-0.22

0.10-0.35O.lO-0.35 1 .00-l .40 1 .00-l .30

55Cr34OCr4

0.50-0.60 0.10-0.35 0.60-0.800.35-0.45 0.10-0.35 0.60-0.90

- 0~60-0~800.90-l .20

5OCr4 0.45-0.55 0.10-0.35 0.60-0.90 0.90-l *20103Cr4 0.95-l .lO 0.10-0.35 0.25-0.45 0.90-l .20

&--------------

Al(9)-

--

.-

-

-

-

(lo,----

----

REFERENCE O RELEVANT INDIANSTANDARDS

(11)IS : 4367-1967l, IS : 4368-1967IS : 2507-19755, I S : 3195~1982,IS : 3431-1982, IS : 383%1966,IS :4072-1967, IS : 4367-19671,IS : 4368-196721s : 3195-19824, IS : 3431-1982sIS : 3195-1982, IS : 3431-1982sIS : 4432-19678IS : 2041-1982*, IS : 2100-1970x,

IS : 4367-19671, I S : 4368-19672,IS : 5517-197811, I S : 6967-197312,IS : 11169 (Part 1 )-198415IS : 5517-197811, IS . 11169(Part 1 )-198413 IS : 3930-1979l*, IS : 4367-19671,IS : 4368-1967*, IS : 5517-1978,IS : 11169 (Part 1 )-198WIS : 3930-19794IS : 4367-1967l, IS : 11169(Part 1 )-19841s IS : 11169 (Part 1 )-198413

IS : 4367-1967l. IS : 4368-1967,IS : 4432~1967*, IS:11169(Part l)-198418IS : 4367-19671, I S : 11169( Part l )-1984l* zIS : 4367-19671, I S : 4368-19671, . .

IS : 4432-19678, I S : 11169( Part 1 )-198418 aIS : 5517-1978ll deIS : 3930-1979, IS : 4367-19671, zIS : 4368-1967*, IS : 5517-1978, =!IS : 11169 (Part 1 )-I98413IS : 3930-197914, IS : 4367-19671 ,rs : 4398-197215 I

( Cmtinue~ ) g_~

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TABLE 1 SPECIFIED CHEMICAL COMPOS[T[ON FOR STANDARD STEEL--m CodCHEMICAL COMPOSITION. PEKCENT

I * -7DESIONAT~~O~ * REFERENCE TO RENVANT ZNDJAN g

STANDARDS 2r\i Mfl Ni Cl-(3) (4) (5) (6)0.10-0.35 0.40-0.80 I .00-l .600.10-0.35 0.25-0.45 I ,40-l .600.10-0~35 0.50-0.80 0.90-I .20

M o(7)

O.I O-0.35 0~50-0~80 I .40-l .700.10-0.35 0.80-I *I O - 0.90-l .200.10-0.35 0.60-0.90 -. 0.90-I .200. IO-O.35 0.60-0.90 - 0.90-l .20

0.15-0.600.15-0.350.10-0.35

0.30, Mn s 0.70-I .lO0.30, Max 2.90-3.400.30, Mnx 2.90-3.40

0.10-0~350.50, MaxO-50, Max0.10-0.350.10-0.350.10-0.450.10-0.35

0~40-0~70040-0.700.40-0.700.40-O .700.40-0.700.40-0.700~40-0~700~40-0~700.40-0.700.50-0.80

0.40, A4o.v 1 .00-l .500.30, Max 4.0-600.30, Max 4.0-6.00.30, MUX I .00-l .500.30, Max 3 .oo-3.500.30, Max I -50-I .803.20-3.60 0.30, Max

0.45-O 650.45-0.650.45-0.650.50-0.700.45-O. 650.45-0.650~50-0~800.90-I *I O0.10-0.25

0.15-0.350.15-0.350.15-0.350.15-0.35O.lO-0.35

0.60-I .oo0.60-l .oo0~40-0~700.30-0.600.60-0.90

0.60-I .OO 0~40-0~800.80-l .20 0.60-l .OO3 .oo-3 50 0.60-l .OO3.00-3.75 0.60-l .lO1.00-l .50 0.45-0.75

0, IO-O.25

0.10-0.35 0~40-0~70 3.90-4.30 1 10-l ,400.15-0.35 0.60-l .OO 1.00-l .50 0.75-l ,25 0.08-0.150.15-0.35 0.60-l .OO 1.50-2.00 0.75-1.25 0~10-0~200.10-0.35 0~40-0~70 1.20-l .60 0.90-l .30 0~10-0~200.10-0.35 0.40-0.70 1.25-l .75 0.90-l .30 0.20-0.350.15-0.35 0.40-0.60 1 .40-l .70 I .50-1.800.15-0.35 0.45-0.65 1.65-2.00 0.40-0.60

0.25-0.350.20-0.30

V Al(8) (9)

0~15-6~300.07-0.120.15, in

B(IO)--

--

-

--

C(2)

O.YO-1 .200.95-l .lO0.45-0.55

(11) w!5IS : 4398-1972IS : 3195-19824, IS : 4367-19671, ,IS : 4368-1967a I(1):::z5OCr4v2

- zIS : 3195-19824 z!zIS : 4367-1967, IS : 4368-1Y672IS : 3930-197911, IS : 4367-1967.IS : 4368-19672, IS: 5517-1978l*IS : 11169 (Part 1 )-198413IS : 4367-1967l, IS : 4368-1967IS : 5517-1978111s : 5517-1978l IS : 11169(Part 1 )-198$=

--

IS : 5517-1978IS : 5517-19781IS : 3444-198716, 1s : 3930-197914,I S : 5517-19781IS : 4432-1Y678IS : 11169 (Part 1 )-198413IS : 4367-1967l, IS : 4368-19672,IS : 11169 ( Part 1 -I98413IS : 3930-197Y1*, IS : 4367-19671,TS 4368-19672, IS : 5517-197811,IS : 11169 (Part 4)-198413IS : .5517-197811IS : 4367-l 967l, IS : 4368-1967a,IS : 4432-19678, I S : 11169( Part 1 )-19841aIS : 4368-1967*, IS : 4432-19678,IS : 11169 ( Part 1 )-198413IS : 3930-1979l. IS : 5517-1978lIS : 3930-19;9l;, IS : 4367-1967l,IS : 5517-197811

42Cr6Vl6oCr4V221Cr4Mo242Cr4Mo2

0.38-0.460.55-0.650.26, Mar0.38-0.45

07Cr4Mo615Cr13Mo62SCr13Mo64OCr5Mo6lOCr20Mo62OCr2Mo6

a 35CrSMo6V24OCr13MolOV24OCr7AllOMo24ONi1416Ni3Cr216Ni4Cr313Ni13Cr3lSNi13Cr3Mo23SNiSCr2

0.12, MUX0~10-0~200.20-0.300.35-0.450.15, Max0.15-0.250.25-0.450.35-0.45o-35-0.450.35-0.45

- ---..-

0.20-0.30 -0.15-0.25 -- 0.90-l .30-

0.12-0.200.12-0.200*10-0~150.12-0.180*30-0.40 -

3ONil6CrS1SNiSCr4Mol

0.26-0.340.12-0.18

15Ni7Cr4Mo24ONi6Cr4Mo24ONi6Cr4Mo316Ni6Cr7Mo32ONi7Cr2Mo2

0.12-O. 18 - _- --

-

0.35-0.450.35-0.450.14-O-190.17-0.22

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31NilOCr3Mo64ONilOCr3 Mo616Ni8Cr6Mo2

20Ni7Mo220Ni2Cr2Mo218ClOBTXT1 6004835c8BT2lClOBT~26ClOBTt34c14BTt38Cr4BT3OCr4Mo2lXr6Ni6

0.27-0.35 0~10-0~35 0.40-0.70 2.25-2-75 0~50-0~80 0~40-0~70 -0.36-0.44 0*10-0*35 0~40-0*70 2.25-2.75 0*50-0*80 0.40-0.70 -0~12-0~20 0.15-0.35 ~0~4&0*70 1.80-2.20 1.40-l *70 0.15-0.25 -

0.17-0.22 O-15-0.35 0.45-0.65 I-65-2-00 - 0~20-0~30 -0*18-0.23 0.15-O-35 0.70-0.90 0.40-0.70 0~40-0~60 0.1X0.25 -0.15-0.201~50-1~700.31-0.360.18-0.230.23-0.290.32-0.370.35-0.40O-28-0.330.12-0.18

0.15-0*300.10-0.350.10-0*350.15-0.300~15-0~300.15-0*300.15-0.300*10-0*35O-15-0.35

0.80-l ~10 0~10-0~30 - -0~2.5-0~50 - ll*O-13.0 0.80, Max 0.80, Max0.60-l .oo -- 0~10-0~30 (optional) 0.80-l *l - - -0.90-l -2 - - -120-l *so -- - - -

0~30-0*50 - o-95-1*15 - -040-0*80 - 0*80-l-10 0.15-0.28 -0.40-0*60 1.40-l .70 1.40-1.70 - -

--

-----------

-

---

0.000 5-0.003-0.000 50.0030.000 5-0.0030.000 5-0.003o-000 5-O-0030.000 5-0~003-

-

rs : 3930-19791 IS : 5517-197811 IS : 4368-1967a, IS : 5517-197811IS : 4367-1967r, IS : 4368-1%7*, IS : 11169(Part l)-1984IS : 4432-19678, IS : 11169(Part 1 )-198413IS : 4132-1967n, 1.8 : 11169

( Part I )-198413-_--

IS : 11169 ( Part I )-198413IS : 111 69 ( Patt I )-198415IS : 11169 (Part 1 )-1984r5IS : 11169 (Part 1 )-198413-

-Nom-In special cases, it may be desirable that the range of carbon content should be more closely controlled than in the ranges specified above. When this is necessary.restricted ranges of carbon may be agreed to between the supplier and the purchaser, in which case any specified mechanical properties shall also be the subject of agreerrent.

Ln *See IS : 1762 (Part l)-1974 Code for designation of steel : Part 1 Based on letter symbols (first revs on ).1SuEx BT indicates boron treated steel.1 Specitication for alloy and tool steel forgings for general industrial use.a Specification for alloy steel bits, blooms and slabs for forgings for general engineering purposes.* Specification for cold rolled steel strip for springs (first revson ). Specification for steel for the manufacture of volute and helical springs (for railway rolling stock ) ( second revisi on ).6 Specification for steel for manufacture of volute, helical and laminated springs for automotive suspension ( secondr evision ).6 Specification for aluminized steel core wire for aluminium conductors (ACSR). Specification for steel for spring washers (firsf revision ).* Specification for case. hardening steels.0 Specification for steel plates for pressure vessels used at moderate and low temperature (first revision ).10Speci8cation for steel billets, bars and sections for boilers (fist revision ).11Specithzation for steels for hardening and tempering (fi rst revision ).1* Specification for steels for electrically welded round link chains.Is Specification for steels for cold heading/cold extrusion applications: Par: 1 Wrought carbon and low alloy steels.14 Specification for flame and induction hardening steels (first revisioir .X5 pecification for carbon-chromium steel for the manufacture of balls, rollers and bearing races (fi rst r evision ).16Specification for corrosion resistant high alloy steel and nickel based castings for general applications ( second revision ).

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IS : 1570 ( Part 4 ) - 1988TABLE 2 SPECIFIED TENSILE LIMITS FOR PLATES, SECTIONS, BARS, BILLETS ANDFORGINGS IN THE HOT ROLLED OR NORMALIZED CONDITION

DESIGNATION

(1)llC15

2oc15

TENSILESTRENGTHMPa*

(2)I 460-560430.530

i 540-64090.59010:610%%

( Clause 2.3 )0.2 PERCENTPRooF STR~,

M in (I~S&~FI ED)(3)270250

320

290501080

ELONC%TION,PERCENTAGE

GLLiiSdi-(4)2626

iii

zi0

570-670i 570-670 350zz ii27Cl5 570-670 20540-640 300540-640 290 z*1 MPa = 1 N/mm* = 0.102 0 kgf/mm*.

:;1::Over 100 andup to 150

,TABLE 3 SPECIFIED TENSILE LIMITS FOR COLD DRAWN 1.5 PERCENT MANGANESESTEELBARS( CIause 2.3 )

DESIGNATION TENSILE TRENQTH ELONGATION, EWENTAGE LIMITINGRUL&GMPa+ GL;ifi65dr SECTIONmm

(1) (2) (3) (4)2OCl5 1:12 Over 20and up to 40Over 40 and up to 63

TABLE 4 SPECIFIED MECHANICAL PROPERTIES FOR BARS AND FORGINGS IN THE HARDENEDAND TEMPERED CONDITION-OIL HARDENED UNLESS OTHERWISE STATED( C lause2.4 )

DESIGNATION TENSILE 0.2 PERCENTSTRENGTH PRooF STRW,MPa* M i n , MPa*

(1) (2) (3)390450i%390490550650490550650750550650750

2oc15 590-740690-84027Cl5 590-740690-84037c15 ZZ$790:940890-1040

690-840790-94035Mn6Mo3 1 890-1040990-l 140790-94035Mn6Mo4 890-1040990-l 140

ELONGATIONPIWXNTAGEGL 5;;dA

(4)18161816

161:

IwD IMPACTVALUE,

BRINEU~HARDNESSM i t t , J oule HBS

(6)170-217201-248170-217201248

170-217%-z;255:311%%25i311285-341229-277255-311285-341

LIMITJNGRULJ NGSECTIONmm

(7)!i

100631501003015150100633015010063

(Conf hued )

6

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IS : 1570( Part 4) - 1988

TABLE 4 SPECJFJEJI MECHANICAL PROPJJRTJBS FOR BARS AND FORGJNGIS JN THE HARDWEDAND TBMJERJJD CONDJTJON-OJL HARDENED UNLJISS OTHERwIlSE STATED - ContdDESIGNATION %N~LE

%cTHs

(2)

EL~~JGATI~NPmCeNTAl3Eypi-

(4)

4OCr4Mo2

15Cr13Mo625Cr%o6

4OCr13MolOV2

42Cr6Vl

4OCr7Al lOMo2

4ONil4

35NiSCr2

30Ni 16Cr5 1540, Min 1240 8

4ONi6Cr4Mo2

40Ni6Cr4Mo3

31NilOCr3Mo6

4ONilOCr3Mo6

I690-840790940890-l 040

I

700-850800-950900-l 0501000-l 150

{

%zz89& p$1090:12401 540, Mitt

{1340, M i t t1 540, Min

t880-l 030980-I 1801 080-I 280

1690840790-940890-l 040

{790-940890-l 040

{690-840790-940890-l 040

I

790-940890-l 040990-l 1401090-l 240

I

790-940890-l 040990-l 140: ~~:f z1540, Min

c ;;y 7:

1; y&J:; z

11 54O;Min990-l 1401 090-l 2401 190-l 3401 540, Min

%650490z750

1312::

490550%8301240

14::1098

1050 81240 8690780880 lf10490550650

18::

550 16650 15490550650

550z:830

1615::

5506507508309301240

f21311106

%8309301240

3:::8

78::9301240

12:r!l8

Min, Joule HBS(9z:50z:50z14211468:;555548z:

z:50

14

55554841z:3011

:413514

$3514

201-248229-277255-311285-341311-363444, Min

363, Min 63444, Min 30265-310295-350320-380

201-248%z:

444, Min

z-:::285-341311-363zz:2851341311-363341-401444, Min255-311285-341zz:444, Min285-34131 l-363341-401444, Min

150z!30150150;:10063

100:;

1501006310063

150Y3( air hardened)150(oil hardened)150100

150;t?z63

z:1501501006633

150150150100*l MPa = 1 N/mm* = 0.102 0 kgf/mm*.+Hardness given in this table is for guidance only.

7

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TABLE 5 LI MITI NG RULI NG SECTIONS (inmm) OF HARDENED AND TEIMPERED STEELS FORDIFFERENT RANGES OF TENSILE STRENGTH( Clause 2.4 )

DESIGNATION TENSILE STRENGTH, MPa~------_-_.-_-_----__ -_-_A_p_ ---520-740 690-840 190-940 890-l 040 990-l 140 1090-l 240 1 190-l 340 1.5~

2OC1527Cl537c1535Mn6Mo335Mn6Mo4400442Cr6Vl4OCr4Mo215Cr13Mo6 and25Crl3Mo6

4OCr13MolOV24OCr7A110Ao24ONi1435NiSCr230Ni16CrS

63100150-

3063100150-100-150150

- - - - - -- -30 15

100 63150 10063 30- 100

100 63150 150

30 - - -63 - - -- - -30 15 - -30 - - -

150 100 - 63

-7-

- - 63 30-150-150-

-100100100

-636363-

----

- - - -

- -

63 30100 63150 100150 150

- 63(air

hardz?:d)(oilhardened)- -30 3063 63

150 100

4ONi6Cr4Mo24ONi6Cr4Mo331NilOCr3Mo64ONilOCr3Mo6

150150-

100150150-

- -- -- -- - -

TABLE 6 CONVERSION OF RECTANGULAR AND SQUARE SECTIONS I NTO EQUIVAL ENT RULI NGSBCTIONS, OIL QUENCHI NG(Ckwse 2.4)

THICKNESSOF ECTIONmm.30 40 50 60 80 00Diameter of Equivalent Rounds, mm(4) (5) (6) (7) (8) (9)

WIDTHOPSECTIONmm -G----- 20

(2) (3)10 -14 2116 2617 2917 3117 3217 3217 3317 3317 3317 3317 3317 3317 3317 3317 3318 33

120 140(10) (11)1)

10203040506080

100120140160180200225250300350 and over

;: = Greater than 160 mm.

- - - - - - - -- - - -32 - - -: 483 - 4 -43 51 59 65,46 57 66 7447 60 71 8048 62 74 8548 63 76 8848 63 77 9048 63 77 9148 63 78 9248 63 78 9248 63 78 9248 63 78 9249 63 78 92

-- ---- --8796

102108112115117119120121121

- - -- -10s117125131136140143145148150

- -130 -140 152148 X154 XX XX XX XX XX X

8

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TABLE 7 CONVERSION OF RECTANGUiAR AND SQUARE INTO EQUIVALENT RULI NG SECTIONAlR COOLlNG

WIDTH OF SECTIONmmr----10 20

(1)10203040506080

100120140160180200225250300350 and over

x -Greater than 160 mm.

(2) (3)1013 2015 2416 2716 2917 3017 3217 3317 3417 3417 3418 3518 3.518 3518 3618 37

20 39

( Clarrse 2.4 )THICKNESSOF SECTIONmm~.~ _--_h---------_-

30 40 50 60 80 100Diameter of Equivalent Rounds, mm(4) (5) (6) (7) (8) (9)-- - -30 - -34 40 - -38 45 51 - - -41 49 55 61 - -45 54 62 70 81 -47 58 68 76 90 10249 62 72 82 98 11150 64 76 86 104 11951 66 79 90 109 12651 67 81 93 114 13252 68 83 95 117 13752 69 85 98 121 14253 70 86 100 125 14754 71 88 104 131 15559 78 97 115 152 X

L -------7120 140(10) (11)

- -- -

-- -- -- -- -- -

122 -132 142140 152148 X154 X

X XX XX XX X

TABLE 8 SPECIF IE D ME CHANICAL PROPERTIE S FOR WEAR RESISTING STEEL IN THEHARDENED AND TEMPE RED CONDITI ON( C/awe 2.5 )

DESIGNATION TENSILE 0 2 PERCENT ELONGATION lzo~ IMPACT, BRINELL LIMITINGSTRENGTH PROOFSTRESS PERCENTAGE VALUE, M i n HARDNESS RULINGMPa* M i n , MPa* GL 5;;dA, Joule HBS SECTION,mm(1) (2) (3) (4) (5) (6) (7)

55Cr3 890-l 040 650 12 35 255-311 63990-l 140 730 10 17 285-341 63NOTE - Hardness given in this table is for guidance only.

TABLE 9 SPECIFI ED MECHANICAL PROPERTIES FOR CASE HARDENI NG STEELS IN THEREFI NED AND QUENCHED CONDITI ON ( CORE PROPERTIE S )( Clarrse 2.6 )

DESIGNATION TENSILE STRENGTH. ELONGATION, ERCENTAGE IZ~D IMPACTVALUE,M i n , MPa* GL 5.65t/z, M i n M i n , Joule

(1) (2) (3) (4)llC15 590 17 5515Cr3 590 13 - 4816Ni3Cr2 690 I5 4116MnXr4 790 10 3516Ni4Cr3 840 12 4113Ni13Cr3 840 12 4820MnSCr5 990 8 3815NiSCr4Mol 990 9 4115Ni7Cr4Mo2 1 080 9 3515Nil3Cr3Mo2 1 080 8 3516Ni8Cr6Mo2 1 340 9 35

NOTE-Whenever the core strength exceeds 1 000 MPa, the ruling section may be same as that of the diameter ofthe test piece.*I MPa = 1 N/mm* -= 0.1 020 kgf/mm*.

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TABLE 10 SPECIFIED TENSILE LIMITS FOR STEEL SHEET AND STRIP( Clurlse 2.7 )

DESIGNATION

(1)

2oc15

CONDITION

(2)[Softened( Hot rolled and normalized or normalized and1

temperedHardened and tempered or cold rolled and1 tempered

TENSILE O-2 PERCENTSTRENGTH, PROOF TRESS,M i t t , MPa* M i n , MPa*

(3) (4)470, M i n -540, M i n -790-990 610

BRINELLHARDNWMax , HBS(5)200-

47c1.5SoftenedHardened and tempered or cold rolled andtemperedHardened and tempered

230890-1 090 740 -1 140-l 340 990 -

21 Cr4Mo2 SoftenedHardened and tempered or cold rolled and 790-990 610temperedHardened and tempered 1 140-l 340 990*1 MPa = 1 N/mm* = 0.1020 kgf/mm*.

212-

DESIGNATION

(1)

2oc15

27C15

4OCr4 and 5OCr4

21Cr4Mo2

4OCr4Mo2

30Nil6Cr5

31NilOCr3Mo6

TABLE 11 SPECIFIED TENSILE LXMITS FOR TUBES

CONDITION( C lause . 7)

(2)f Annealed1Hardened and tempered or cold drawn and1 +F;:i and tempered or cold drawn andI Hardened and tempered or cold drawn and1 tempered

1

Hardened and tempered or cold drawn andtemperedHardened and tempered or cold drawn andtemperedHardened and tempered

f Normalized and tempered, hardened and tem-pered or cold drawn and temperedNormalized and tempered, hardened and tern--pered or cold drawn and tempered{ Hardened and tempered or cold drawn andi temperedI Hardened and tempered or cold drawn andj tempered _LHardened and temperedHardened and temperedtemperedHardened and tempered

Hardened and tempered

or cold drawn and

TENSILE O-2 PERCWT ELONGATION,STRENGTH, ?%%3 PERCBNTAQE,M i n , MPa* , GL 547; ,/A(3) (4)470 270550 I450630 510710 590550630

1 090550630710790190710

1 o;o1 1901 290

450510

890450570590640990590

89010901 090

(5)

9 310Actual tensilestrength (MPa)

*1 MPa = 1 N/mm* = 0.1 020 kgf/mma.

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TABLE 12 TENTATIVE HARDENABILITY LIMITS FOR SPECIFI ED HARDENABILI TYOF BORON STEELS

DISTANCE ROMQUENCHEDEND, mm (inch)

(1)1.58 (l/W3.10 (2/16)4.76 (3/16)6.35 (4/16)7.93 (5/16)9.52 (6/16)

11.11 (7/16)12.7 (8/16)14.29 (9/16)15.87 (10/16)17.46 (11/16)19.05 (12/16)20.64 (13/16)12.22 (14/16)25.4 (16/16)28.57 (18/16)31.75 (20/16)34.92.(22/16)38.10 (X/16)41.27 (26/16)44.45 (28116)47.62 (30/16)50-S (32/16)

( Cluuse 2.11 !HARDNESS.HRC

c18ClOBT

(2) (3)46 3945 3742 3238 2237 2035 1432 1230 10- -- -- -- -- -- -- -- -- -- -- -- -- -- -

21ClOBT(4) (5)48 4147 4046 3844 3040 2035 -32 -27 -22 -20 -- -

- -

- -

35C8BT(6) (7)58 5156 5055 4654 4352 3749 2646 2238 2036 1930 1828 -27 -- -26 -25 -- -24 -- -22 -- -20 -

26ClOBT(8) (9)52 4551 4450 4348 4146 3445 2542 -35 -32 -28 -26 -22 -- -- -- -- -- -- -- -- -- -

34C14BT(10) (11)58 5057 5056 4955 4854 4353 3752 3351 26- -46 22- -45 21- -43 2038 -- -32 -- -30 -- -28 -- --- - - -- - - -27 -

38CdMn;B;(12) (13)60 5259 5258 5157 5056 4855 4454 4053 3650 3448 3046 2644 2442 2238 20

- -- -

11

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