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Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

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“Invent a New India Using Knowledge”

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“Step Out From the Old to the New”

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“The Right to Information, The Right to Live”

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“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 9175-6 (1986): Rationalized Steels for Automobile andAncillary Industry, Mechanical and Physical Properties -Part 6 40C8 Grade Steel [MTD 16: Alloy Steels and Forgings]

IS : 9175 ( Part 6 ) - 1986

Indian Standard SPECIFICATION FOR

RATIONALIZED STEELS FOR THE AUTOMOBILE AND ANCILLARY INDUSTRY

PART 6 MECHANICAL AND PHYSICAL PROPERTIES OF 4OC8 GRADE STEEL

Co-ordinating Committee on Materials for Automobiles, SMDC 31

Chairman Representing

SHRI C. V. TIKEKAR Tata Engineering & Locomotive Co Ltd, Jamshedpur

Mtmbrrs

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

SHRI V. P. AQRAWAL Steel Authority of India Ltd ( Rourkeh Steel Plant ), Rourkela

SHRI A. K. MALHOT~A ( Altsrnatv) SERI R. BHANDARI All India Automobile and Ancillary Industries

Association, Bombay SHRI S. PANIKAR ( Alfcrnatr )

SHRI R. BHATTACHARYYA Guest Keen Williams Ltd, Howrah SHRI A. T. BORATE Premier Automobiles Ltd, Bombay

SEIRI J. M. SHAH ( Altcrnata ) SHRI R. R. CONTRACTOR Automobile Products of India Ltd, Bombay

SHRI V. A. RAJA~ONEY ( Altsrnatr ) SRRI S. P. DEY Hindustan Motors Ltd, Uttarpara Snn~ V. G~PAL Lucas-TVS Ltd, Madras

SHRI K. S. SIJBRAMANIAN ( Alternate ) SHRI S. C. GUPTA Tata Iron & Steel Co Ltd, Jamshedpur

SHRI A. N. MITRA ( Alternate ) SERI D. N. GUP~A SteelBt;;!rity of India Ltd ( Bokaro Steel Plant ),

SARI H. A. JAISINORANI Mahindra and Mahindra Ltd, Bombay SHRI S. RAMACHANDRAN ( Alternate )

SHRI R. C. JEA Steel Authority of India Ltd ( Alloy Steel Plant ), Durgapur

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

SRRI S. R. SAL~IA ( Alternate ) SHRI S. S. LAKHTJNDI Bharat Forge Co Ltd, Pune

DR M. K. S. CHERUKU~N ( Alternate )

( Continaad on page 2 )

@ Copyright 1987

BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian Copyright Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act. I

IS : 9175 ( Part 6 ) - 1986

( Continued from fige 1 )

Members Representing

SHRI S. C. MAHINDRU Chief Inspectorate of Heavy Vehicles, Avadi SHRI P. SOXAS~JNDRAM ( Alternate )

COL P. M. MENON Directorate of Standardization ( Ministry of Defence ), New Delhi

DR V. PANDURANC+A Tractors and Farm Equipment Ltd, Madras SHRI T. K. STJ~BARAYAN,( Altematc)

DR R. V. PATHY Mahindra Ugine Steel Co Ltd, Bombay SHRI R. N. SIN~H ( Alternate)

SHRI K. PARTHA~AXWHY Ashok Leyland Ltd, Madras SHRI T. S. SUDARSHAN ( Alternate )

DR P. C. PATANKAR Central Institute of Road Transport, Pune SHRI L. SHANTARAM ( AhMTt# )

SHRI G. R. P~AXASH Visvesvarya Iron & Steel Ltd, Bhadravati SHRI 0. HARIDASACHAR ( Altrnatc)

SHRI R. RAQHAVAN Enfield India Ltd, Tiruvottiyur SHRI J. M. BALARAB~AN ( Alternate )

SHRI AJAY KUYAR RAMAX Escorts Ltd, Faridabad SHRI S. D. KHANNA ( Altcrnatr )

DR V. RAMASWAMY Steel Authority of India Ltd ( Research & Develop- ment Centre for Iron and Steel ), Ranchi

SHRI S. R. MEDIRATTA ( Alternate ) SHRI C. V. K. MURTHY RAO Association of Indian Automobile Manufacturers,

Bombay SHRI ANANTHA REDDY Nagarjuna Steels Ltd, Hyderabad

SHRI J. SRINIVAS ( Altsrnate ) REPBESENTATIVE Automotive Research Association of India, Pune SHRIK.SHANKARANARAYANAN Directorate General of Technical Development,

New Delhi SHRI S. K. SHARMA Ministry of Industrial Development ( Small Scale

Industries ), New Delhi SHRI T. R. SEB~AL ( Alternate )

SHRI A. R. SOMALKAR Mahindra and Mahindra Ltd, Bombay SHRI A. R. JAMKA ( Alternate)

SHRI L. SRINIVASAMADHVAN Standard Motor Products of India Ltd, Madras SHRI K. RAN~ANATHAN ( Alternate )

SHRI S. TIWARI Directorate General of Ordnance Factories, Calcutta SHRI G. N. ROY ( Alternate )

SRRI K. RAOHAVENDRAN. Director General, BIS ( Ex-&io Member ) Director ( Strut 8t Met’)

Secretary

SRRI B. K. MIJKHOPADHAYAY Deputy Director ( Metals ), BIS

( Continud on page 9 )

2

IS : 9175 ( Part 6 ) - 1986

Indian Standard SPECIFICATION FOR

RATIONALIZED STEELS FOR THE AUTOMOBILE AND ANCILLARY INDUSTRY

PART 6 ,MECHANICAL AND PHYSICAL PROPERTIES OF 4OC8 GRADE STEEL

0. FOREWORD

0.1 This Indian Standard ( Part 6 ) was adopted by the Indian Stand.ards Institution on 20 November 1986, 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 properties, 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 these properties given in this standard is only fbr guidance and information purposes.

0.3 In reporting the result of a test or analysis, made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done in accordance with IS : 2-1960*.

1. SCOPE

1.1 This standard ( Part 6 ) covers the chemical composition, mechanical properties, h ar enability and isothermal transformation characteristics d of 4OC8 grade of steel for use by automobile and ancillary industry.

1.2 This is a plain carbon steel, intended to be used in the hardened and tempered condition.

*Rules for rounding off numerical values ( revircd).

3

IS : 9175 ( Part 6 ) - 1986

2. CHEMICAL COMPOSITION

t.olf;he chemical composition of this grade of steel shall be as given :

. Constituents, Percent r_----_------_h__----- -----7

C Si Mn s P

0.350.45 0*15-0.35 0*60-0.90 O-035 Max 0’035 Max

3. HARDNESS

3.1 The hardness for this grade of steel delivered in the annealed or normalized condition, when determined in accordance with IS : 1500- 1983*, shall be 207 HB maximum.

3.2 The surface hardness obtainable of this grade of steel, by flame or induction hardening, shall be 53-59 HRC.

4. MECHANICAL PROPERTIES

4.1 The mechanical properties of this grade of steel in the normalized, hardened and tempered condition, when determined in accordance with IS : 1598-1977t and IS : 1608-19722, shall be as given below:

Hardened JVormalized

Tensile strength, MPa 650-800 570

Yield strength, MPa, Min 450 300

Elongation gauge length 5.654% Min, percent 16 18

Izod impact value, Joules, Min ,30 -

Limiting ruling section, mm 30 -

5. HOT WORKING AND HEAT TREATMENT TEMPERATURES

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

Forging/rolling temperature 1 250°C

Annealing temperature 830-860°C

Normalizing temperature 830-860°C

Subcritical annealing temperature 650-700°C

Hardening temperature 830-860°C

Tempering temperature 660°C

*Method for Brine11 hardness test for steel ( jirst revision ). fMethod for Izod impact test of metals (Jirst revision ). fMethod for tensile testing of steel products (Jirst reuision ).

4

IS t 9175 ( Part 6 ) - 1986

6. HARDENABILITY 6.1 The end quench hardenability band is given in Fig. 1.

70

60

50

z = 40

% w

$ 30

9

20

10

FIG. 1

1 0 5 10 15 20 25

DISTANCE FROM QUENCHED END OF BAR

Distance mm

10 15 20 25 26 27

IN mm

HRC Max

So 58

28

E - -

22 - 20 - -

END QUENCH HARDENABILITY BAND OF 4OC8 GRADE STEEL

5

IS : 9175 ( Part 6 ) - 1986

7. EFFECT OF TEMPERING ON MECHANICAL PROPERTIES

7.1 The curves for effect of tempering on the mechanical properties of the steel are given in Fig. 2 and 3.

8. EFFECT OF SECTION SIZE ON MECHANICAL PROPERTIES

8.1 The band for the effect of section size on mechanical properties is given in Fig. 4.

9. MACHINABILITY

9.1 The machinability of this grade of steel in the normalized condition is approximately 70-75 percent of that for mild steel, whilst in hardened and tempered condition, it is only 65-70 percent of mild steel ( 2OC8 ).

25mm DIA BARS OIL QUENCHED FROM

110 860° AND TEMPERED

70 z

f 100 / . W

E :. 60%

iL

- “V

“E _E. 50

y” LO

30

30 --loo 200 300 LOO 500 600 700

TEMPERING TEMPERATURE ‘C

Fm. 2 CURVES SHOWING THE EFFECT OF TEMPERING TEMPERATURE ON MECHANICAL PROPERTIES OF 4OC8 GRADE STEEL

6

IS : 9175 ( Part 6 ) - 1986

5 120 .5 = 110 Q: .5j 100 W 2 90

f 80 N

50

?I)mm DIA BARS OIL WENCHED FROM 870’ AND TEMPERED

2o II 10 100 200 300 400 500 600 700

TEMPERING TEMPERATURE ‘C

FICL 3 CURVES SHOWING THE EFFECT OF TEMPERING TEMPERATURE ON MECHANICAL PROPERTIES OF 4OC8 GRADE STEEL

IS t 9175 ( Part 6 ) - 1986

90

80

70

30

20 70

.DIL QUIZNCHED AND TEMPERED AT 650°C

I I I I I

1 e REDUCTION 1 OF AkEA

m ELONGATlONj

0 25 50 75 100 125 1601

EAR DIAMETER IN mm

nm

Fra. 4 CURVES SHOWINO THE EFFECT OFSECTION SIZE ONMECHANICAL PROPERTIES OF 4OC8 GRADE STEEL

8

IS : 9175 ( Part 6 ) - 1986

( Continued from page 2 )

Panel to Collect Data on Steel for Automobile Purposes, SMDC 31 : P 12

Convener Rcpressnting

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

Members

SEW R. NAKAYANAN ( Alternate to Dr R. V. Pathy )

Pnos R. C. CHATUR~DI Indian Institute of Technology, Bombay SERI B. HARIDASAOEAR Visvesvaraya Iron and Steel Ltd, Bhadravati

SHRI D. P. VERNEKAR ( Alternate ) SHRI H. A. JAISINQHANI Mahindra & Mahindra Ltd, Bombay SERI M. G. LAW.&TE Tata Engineering & Locomotive Co Ltd, Pune Ds V. RAYASWAMY Steel Authority of India Ltd ( Research and

Development Centre for Iron & Steel), Ranchi SHRI S. R. MEDIRATTA ( Altcrnatr )

REPRESENTATIVE Automobile Products of India Ltd, Bombay DR K. R. SATYANARAYANAN College of Engineering, Pune

DR R. D. CHAVDHARI ( Alternate )

INTERNATIONAL SYSTEM OF UNITS ( SI UNITS )

Base Units

QUANTITY

Length

Mass

Time

Electric current

Thermodynamic temperature

Luminous intensity

Amount of substance

Supplementary Uuito

QUAMTITY

Plane angle

Solid angle

Derived Units

QUANTITY

Force

Energy

Power

Flux

Flux density

Frequency

Electric conductance

Electromotive force

Pressure, stress

.UNIl!

metre

kilogram

recond

ampere

kelvin

candela

mole

UNIT

radian

steradian

UNIT

newton

joule

watt

weber

tesla

hertz

siemens

volt

Pascal

SYMBOL

m

kg .Y

A

K

cd

mol

SYMBOL

rad

sr

W

Wb

T

HZ

S

V

Pa

DEFINITION

1 N = 1 kg.m/s*

1 J = 1 N.m

1 W = 1 J/s

1 Wb = 1 V.s

1 T= 1 Wb/m*

1 Hz = 1 c/s (a-1)

1 s - 1 A/V

1 V= lW/A

1 Pa = 1 N/m*