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है”ह”ह

IS 9175-23 (1987): Rationalized Steels for Automobile andAncillary Industry, Mechanical and Physical Properties -Part 23 25Cr13Mo6 Grade steel [MTD 16: Alloy Steels andForgings]

lndian Standard

IS : 9175 ( Parf 23 ) - 1967

SPECIFICATION FOR RATIONALIZED STEELS FOR THE

AUTOMOBILE AND ANCILLARY INDUSTRY

PART 23 MECHANICAL AND PHYSICAL PROPERTIES OF 25Crl3Mo6 GRADE STEEL

Co-ordinating Committee on Materials for Automobiles, SMDC 31

Chairman Representing SHRI C. V. TIKEKAR Tata Engineering & Locomotive CO Ltd.

Jamshedpur Members

SHRI A. K. ROY ( Alternate to Shri C. V. Tikekar )

SHRI V.P. AGRAWAI. Steel Authority of India Ltd ( Rourkela Steel

SHRI A. K. MALHOTRA ( AIternate ) Plant ), Rourkela

SHRI R. BHANDARI All India Automobile and Ancillary Industries

SHRI S. PANJKAR ( Alternate ) Association, Bombay

SHR~ R. BHATTACHARY YA Guest Keen-Williams Ltd, Calcutta SHRI A. ‘I’. BORATE Premier Automobiles Ltd. Bombay

SHRI J. M. SHAH ( Alternate ) SHRI R. R. CONTRACTOR Automobile,Product of India Ltd, Bombay

SHRI V. A. RAJAMONEY ( Alternate ) SARI .S. P. .DEY Hindustan Motors Ltd, West Bengal SHRI V. GOPAL Lucas-TVS Ltd. Madras

SHRI IL S. SUBRAMANIAN ( Alternate ) SHRI D. N. GUPTA Bokaro Steel Plant ( SAIL ), Bokaro SHRI S. C. GUPTA The Tata Iron and Steel Co Ltd, Jamshedpur

DR A. N. MJTRA ( Alternate ) SHRI H. A. JAISJNGHANI Mahindra and Mahindra Ltd, Bombay

SHRI 5. RAMACHANDRAN ( Alternate ) SHRI R. C. JHA Steel Authority of India Ltd (ASP), Durgapur

SHRI R. C. MODI ( Alternate ) SHRI M. L. KATYAL Bajaj Auto Limited, Pune

SHRI S. R. SALGJA ( Alternote ) SHRI S. 6. LAKHUNDJ Bharat Forge Co Ltd, Pune

DR M. K. S. CHERUKURU ( Alternate ) ( Continued an page 2 )

ca) Copyright 1988 BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian Copyright Act ( XIV of.19:7 ) and reproduction in whole or in part by any means except with written permlssJ.on of the publisher shall be deemed to be an infringement of copyright under the said Act.

IS : 9175 ( Part 23 ) - 1987

( Continued from page 1 ) Members Representing

SHRJ S. C. MAHJNDRU Chief Inspectorate of Heavy Vehicles, Avadi SHRI P. SOMASUNDRAM ( Alternate )

COL P. M. MENON Directo;;;; of Standardization ( DGI ), New

DR V. PANDURANGA Tractors and Farm Equipment Ltd. Madras SHRI T. K. SUBBARAYAN ( Alternate )

SHRI K. PARTHASARTHY Ashok Leyland Ltd, Madras SHRI T. S. SUDARSHAN ( Alternate )

DR P. G. PATANKAR Central Institute of Road Transport, Pune SHRI L. SHANTARAM ( Alternate )

DR R. V. PATHY SHRI R. N. SINOH ( Alternate )

Mahindra Ugine Steel Co Ltd, Bombay

SHRI G. R. PRAKASH Visvesvarya Iron & Steel Ltd, Bhadtavati SHRI B. HARJDASACHAR ( Alternate )

SH~I R. RA~HAVAN Enfield India Ltd, Tiruvottiyur SHRJ T. M. BALARAMAN ( Alternate )

SHRI AJAY KUMAR RAMAN Escorts Ltd. Faridabad SHRI S. D. KHANNA ( Alternate )

DR V. RAMASWAMY SAIL ( Research &‘Development Centre for Iron and Steel ), Ranchi

SHRJ S. R. MEDIRATTA ( Afternate ) SHRJ C. V. K. MURTHY RAO The Association of Indian Automobile Manu-

SHRI S. P. RAO facturers, Bombay

WG Forge and Allied Industries Ltd, Thane SHRI B. K. ANAN~HARAMIAH ( Alternate )

SHRI ANANTHA REDDY SHRI J. SRINIVAS ( Alternate )

Nagarjuna Steels Ltd, Hyderabad

REPRESENTATIVE REPRESENTATIVB

Ministry-of Defence ( DGI ), New Delhi Autom&F Research Association of India,

SHRI A. S. SAUND SHRI B. S. SAIJND ( AIternute )

Saund Zweired Union ( I ) Ltd, Gwalior

SHRI K. SHANKARANARAYANAN Directorate General of Technical Development, New Delhi

SHRI S. K. SHARMA Ministry of Industrial Development, New Dclbi SHRI T. R. SEHGAL ( Alternate 1 _

SHRI A. R. SONALKAR Mabindra and Mahindra Ltd. Bombay SHRI A. R. JANIKA ( Alternate )

SHRI L. SRINIVASAMADHVAN The Standard Motor Products of India Ltd, Madras

SHRI K. RANGANATHAN ( AIternate ) SHR~ M. S. GANAPATHY Mopeds ( India ) Ltd. Tirupathi

SUBRAMANIAM _ _

SHRI A. G. NAMMALVAR ( Alternate ) SHRI S. TIWARI Directorate General Ordnance Factories,

Calcutta SHRI G. N. ROY ( Alternate )

SWRI K. RAGHAVENDRAN. Director ( Strut & Met )

Director General, BIS ( Ex-officio Member )

Secretary

SHRI B. K. MUKHOPADHYAY Assistant Director ( Metals ), BIS

( Continued on page 6 )

2

IS : 9175 ( Part 23 ) - 1987

Indian Standard SPECIFICATION FOR

RATIONALIZED STEELS FOR THE AUTOMOBILE AND ANCILLARY INDUSTRY

PART 23 MECHANICAL AND PHYSICAL PROPERTIES OF 25Crl3Mo6 GRADE STEEL

0. FOREWORD

0.1 This Indian Standard (Part 23 ) was adopted by the Bureau of Indian Standards on 25 September 1987, after the draft finalized by the Co- ordinating Committee on Materials for Automobiles had been approved by the Structural and Metals Division Council.

0.2 Part 1 of this standard was published in 1979 which covers the chemical composition of 33 rationalized steels. The mechanical pro- perties, hardenability and isothermal transformation characteristics of these 33 rationalized steels are being covered in different parts of this standard ( Parts 2 to 34 ). The data concerning to these properties given in this standard is only for guidance and information purposes.

0.3 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, ex- pressing the result of a test or analysis, shall be rounded off in accordance with the IS : 2-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

1. SCOPE

1.1 This standard ( Part 23 ) covers the mechanical properties, harden- ability and isothermal transformation characteristics of 25Cr 13Mo6 grade of steel for use by automobile and ancillary industry.

*Rules for rounding off numerical values ( revised ).

3

IS : 9175 ( Part 23 ) - 1987

2. CHEMICAL COMPOSITION )

2.1 The chemical composition of this grade of steel shall be as given below:

Constituents, Percent ~~_~__~~-~~~~~~-A~~~_~~~~~~~-~-~

C Si Mn Ni Cr MC S P 0.2~@30 O*lO-0.35 0*40-0.70 0.30, Max 2.90-3’40 0.45-0.65 0.035, Max 0.035, Max

3. HARDNESS

3.1 The maximum hardness for this grade of steel delivered in the annealed condition when determined in accordance with IS : 1500-1983* shall be 250 HB.

4. MECHANICAL PROPERTIES

4.1 The mechanical properties of this grade of steel in the hardened and tempered condition when determined in accordance with IS : 1598-1977t and IS : 1608- 1972$ shall be as given in Table I.

TABLE 1 MECHANICAL PROPERTIES IN THE HARDENED AND TEMPERED CONDITION

LIMITIN RLJLIN~ SECTION

mm

(1) 150 150 150 150 100 63

TENSILE 0.2 PERCENT ELONOAT~~N IZOD BRINELL STRENGTH PROOF STRESS G.L. 5.65 d/so IMPACT HARDNW

MPa Min Min Min HB MPa PERCENT JOULES

(21 (3) (41 (51 (61 690-840 480 790-940 550 :: :d

201-248 229-277

890-l 040 650 11 255-311 990-l 140 750 10 ::

1 090-l 240 830 41 ;;:-3364: 1 540. Min 1240 : 14 444: Min

5. HOT WORKING AND HEAT TREATMENT TEMPERATURES

5.1 The recommended hot working and heat treatment temperatures shall be as given below:

Hot working temperature 12OO”C, MUX Hardening temperature 890-9 10°C Tempering temperature 700°C Max

6. TRANSFORMATION CHARACTERISTICS

6.1 The isothermal transformation diagram for this grade of steel is given in Fig. 1.

*Method for Brine11 hardness test for metallic materials ( second revision ). tMethod for Izod impact test of metals (first revision ). $Method for tensile testing of steel products (first revision ).

4 _

IS:9175(Part23)-1987'

AlJSTENlTlZlNG TEMPERATURE 9OO’C 30 Mln

600

500

0” .

L 3 2 400

s a

I, v-

300

200

100

1 2 5 10 20 LO 1 2 5 10 20 LO 1 2 5 10 20 1

Sec. Min. Hr. Day

DURATION OF ISOTHERMAL TREAlMENl

Frc.1 ISOTHERMAL TRANSFORMATION DIAGRAM 0~25Cr 13Moj GRADE STEEL

Chemical Composition ( Percent ) Mn S Cr MO 0’55 0’022 0’010 3’34 0’54

5

IS : 9175 ( Part 23 ) - 1987

( Continued from page 2 )

Panel to Collect Data on Steel for Automobile Purpose, SMDC 31/P-12

Convener Representing DR R. V. PATHY Mahindra Ugine Steel Co Ltd, Khopoli

Members SHRI B. K. ANANTHARAMAIH WG Forge and Allied Industries Ltd. Thane

SHRI 0. B. DIAS ( Alternate ) PROF R. C. CHATURV~DI Indian Institute of Technology, Bombay SHRI B. HARIDASACHAR Visvesvaraya Iron and Steel Ltd, Bhadravati

SHRI D. P. VERNEKAR ( Alternate ) SHRI H. A. JAISINGHANI Mahindra & Mahindra Ltd, Bombay SHRI M. G. LAWATE The Tata Engineering & Locomotive Co Ltd,

Pune DR V. RAMASWAMY Rescal;Ci;;id Development Hindustan Steel Ltd.

SHRI S. R. MEDIRATTA ( Alternate ) _- REPRESENTATIVE Automobile Products of India Ltd. Bombay

DR K. R. SATYANARAYANAN College of Engineers, Pune DR R. D. CHAUDHARI ( Alternate >

6