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है”ह”ह

IS 9175-15 (1987): Rationalized Steels for Automobile andAncillary Industry, Mechanical and Physical Properties -Part 15 37C15 Grade steel [MTD 16: Alloy Steels andForgings]

IS : 9175 ( Part 15 ) - 1987

Indian Standard SPECIFICATION FOR

RATIONALIZED STEELS FOR THE AUTOMOBILE AND ANCILLARY INDUSTRY

PART 15 MECHANICAL AND PHYSICAL PROPERTIES OF 37C15 GRADE STEEL

Co-ordinating Committee on Materials for Automobiles, SMDC 31 Chairman Representing

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

Members SHRI A. K. ROY ( AIternate to

Shri C. V. Tikekar ) SHRI V. P. AGRAWAL Steel Authority of India Ltd ( Rourkela Steel

Plant ), Rourkela SHRI A. K. MALAOTRA ( Alternate )

SHRI R. BHANDARI All India Automobile and Ancillary Industries Association, Bombay

SHRI S. PANIKAR ( Alternate ) SHRI R. BHATTAGHARYYA Guest Keen Williams Ltd. Calcutta SHRI A. T. BORATIZ Premier Automobiles Ltd. Bombay

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

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

SHRI K. S. SUBRAMANIAN (Alternate ) SHRI D. N. GUPTA Bokaro Steel Plant ( SAIL ), Bokaro SHRI S. C. GWI’A Tata Iroo & Steel Co Ltd, Jamshedpur

DR A. N. MITRA ( Alternate ) SHRI H. A. J~ISINOHANI Mahiodra and Mahindra Ltd, Bombay

SHRI S. RAMACHANDRAN (Alternate ) SHRI R. C. J.HA Steel Authority of India Ltd, (ASP), Durgapur

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

SHRI S. R. SALGIA ( Alternate ) SHRI S. S. LAKHUNDI Bharat Forge Co Ltd, Pune

DR M. K. S. CHERUKURN ( Alternate ) ( Continued on page 2 )

0 Copyright 1988

BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian Copyrighf 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.

IS : 9175 ( Part 15 ) - 1987

< Continued from page 1 )

Members Representing

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

COL P. M. MENON Directeq&te of Standardization ( DGI ), New

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

. SHRI K. PARTHASARTHY A&ok Leyland Ltd, Madras SHRI T. S. SUDARSHAN( Alternate)

Dn P. G. PATANKAR (Alternate)

Central Institute of Road Transport, Pune SHRI L. SHANTARAM

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

Mahindra Ugine Steel Co Ltd. Bombay

SHRI G. R. PRAKASH Visvesvarya Iron & Steel Ltd, Bhadravati SHRI B. HARIDASACHAR ( Alternate )

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

SHRI AJAY KUMAR RAMAN SHRI S. D. KHANNA ( Afternate )

Escorts Ltd, Faridabad

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

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

turers, Bombay SHRI S. P. RAO WG Fmge and Allied Induitries Ltd, Thane

SHRI B. K. ANANTHARAMIAH ( Alternate ) SHRI ANANTHA REDDY

SHRI J. SRINIVAS ( Alternate ) Nagarjuna Steels Ltd, Hyderabad ,

REPESENTATIVE Ministry of Defence ( DGI ), New Delhi REPRESENTATIVE Automotive Research Association of India.

SHRI A. S. SAUND Pune

SHRI B. S. SAUND ( Afternate ) Saund Zweired Union (I) Ltd, Gwalior

SHRI K. SHANKARANARAYANAN Directorate General of Technical Development New Delhi

SHRI S. K. SHARMA SHRI T. R. SEHGAL ( Alternate )

Ministry of Industrial Development, New Delhi

SHRI A. R. SONALKAR SHRI A. R. JANIKA (Alternate)

Mahindra and Mahindra Ltd Bombay

SHRI L. SRINIVASAMADHVAN The StMa;Ta;d Motor Products of India Ltd,

SHRI K. RANGANATHAN ( Alternate ) SHRI M. S. GANAPATHY Mopeds ( India ) Ltd. Tiruoathi _

SUBRAMANIAM SHRI A. G. NAMMALVAR ( Alternate )

SHRI S. TIWARI Directorate General of Ordnance Factories, Calcutta

SHRI G. N. ROY ( Alternate ) , SHRI K. RAGHAVENDRAN,

Director (Strut & Met ) Director General, BIS ( J&officio Member )

Secretary SHRI B. K. MUKHOPADHAYAY

Assistant Director ( Metals ), BIS ( Continued on page 11 )

2

IS : 9175 ( Part 15 ) - 1987

Indian Standard SPECIFICATION FOR

RATIONALIZED STEELS FOR THE AUTOMOBILE AND ANCILLARY INDUSTRY PART 15 MECHANICAL AND PHYSICAL PROPERTIES OF

37C15 GRADE STEEL

0. FOREWORD

0.1 This Indian Standard (Part 15) was adopted by the Bureau of Indian Standards on 29 October 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 IS : 9175* was published in 1979 which covers the chemi- cal 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 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, expressing the result of a test or analysis, shall be rounded off in accord- ance with IS : 2-19607. 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 15) covers the chemical composition, mechanical properties, hardenability and isothermal transformation characteristics of 37C15 grade steel for use by automobile and ancillary industry.

1.2 This is an unalloyed steel, intended to be used in the hardened and tempered condition.

*Specification for rationalized steels for the automobile and ancillary industry t Part 1 Chemical composition.

TRules for rounding off numerical values (revised).

3

IS : 9175 ( Part 15 ) - 1987

2. CHEMICAL COMPOSITION

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

Constifuents, Percent ~~~~~~~~_- ---. -- h-_----------_--~

0*3:042 O~lO%35 Mn s P

1’30-1’70 0’035, Max 0’035, Max

3. HARDNESS

3.1 The maximum hardness for this grade of steel delivered in the annealed or normalized condition when determined in accordance with IS : 1500-1973+ shall be 220 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 : 159%1977t and IS : 160%1972$ shall be as given in Table 1.

TABLE 1 MECHANICAL PROPERTIES IN THE HARriENED AND TEMPERED CONDITION

p&r;-

SECTION

(1)

TENSILE 0.2 PERCENT ELONGATION IZOD HARDNESS STRENGTH PROOF STRESS, G.L.=5*65d/sQ IMPACT, MPa Min Min, PERCENT Min

MP2i HB (2) 13) (4) (6)

100 60@750 440 :: 48 170-217

j”: 700.850 800-950 600 540’ 16 48 48 201-248 229-277 15 900-l 0.50 700 15 41 255-3 11

5. HOT WORKING AND HEAT TREATMENT TEMPERATURES

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

a) Forging/rolling temperature 1 200°C b) Normalizing temperature 850~870°C c) Annealing temperature 840-870°C d) Process annealing temperature 600-660°C

*Method for Brine11 hardness test for mettalic materials ( second revision ). TMethod for Izod impact test of metals (firsf revision ). IMethod for tensile testing of steel products (first revision ).

4

IS : 9175 ( Part 15 ) - 1987

e) Hardening temperature 850-870°C f) Tempering temperature 6OO”C, Max

6. TRANSFORMATION CHARACTERISTICS

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

'0° 1200 t

600 - 1000

5 500 - h 800 K:oo -

i!

E 300 600

-’

c 200 boo -

100 - 200

O- 0.

8 86

15

18

21

33 Ll

46

59

5 1 2 5 10' to2 103 10‘ 105 166

TIME-SECONDS

Chemical Composition, Percent r_-----_-A -_A-_--- 7

C Mn o-43 1’58

FIG. 1 ISOTHERMAL TRANSFORMATION DIAGRAM FOR 37C15 GRADE STEEL

5

IS : 9175 ( Part 15 ) - 1987

7. HARDENABILITY

7.1 The end quench hardenability curve is given in FJ~.

50

45

LO

35 v “I 30

$ 25

Y 0 20 (r: a I 15

10

5

1 t I

0 5 10 15 20 25 30 35 LO 45 50

DISTANCE FROM THE QUENCHED END FACE IN mm

Distance, mm 1 2 3 4 5 6 7 8 9 10 152025 304050

HRC, Min 50 50 48 47 45 43 38 35 32 30 20 13 - - - -

HRC, MUX 59 59 58 57 56 56 55 54 52 51 454037343333

FIG. 2 END QUENCH HARDENABILITY TEST DATA OF 37C15 GRADE STEEL

6

IS : 9175 ( Part 15 ) - 1987

8. EFFECT OF TEMPERING ON MECHANICAL PROPERTIES

8.1 The curve for effect of tempering on the mechanical properties of the steel is given in Fig. 3 and 4.

9. EFFECT OF SECTION SIZE ON MECHANICAL PROPERTIES

9.1 The curves for the effect of section size on mechanical properties are given in Fig. 5 to 7.

BARS 38-l mm dia. OIL QUENCHED 860°C

1200

1050

900

750

n 600 :

L50

300

150

0

go

80

70

60

w 5o

2 + LO

2

: 30 aw

20

10

0

E LONGATfON

100 200 300 LOO 500 600 700

TEMPERING TEMPERATURE ‘C

c 110

100

90

80

70

6o z.

: 5o 0 Y.

GO

30

20

10

0

FIG. 3 CURVES SHOWING THE EFFECT OF TEMPERING TEMPERATURE

ON MECHANICAL PROPERTIES OF 37C15 GRADE STEEL

7

IS :9175(PartlS) - 1987

90

80

60 w

: 50 Li

i LO W

a 30

10

BARS 38.7 mm dia WATER QUENCHED 86O’C

I I I IZOD IMPACT-._

I I

REDUCTION _OF AREA1

i ELONGATION !J

I

- 1350 r-108

- 1200 -100

- 90 - 1050

- 80

- 900 -70 y

- 75og .-60 ;

- 500 - 50

-LO - 450

- 30

- 300 -20

- 150

500 600 700 /

TEMPERING TEMPERATLJRE,‘C c f

Fro. 4 CURVES SHOWING THE EFFECT OF TEMPERING TEMPERATURE

ON MECHANICAL PROPERTIES OF 37ClS GRADE STEEL

8

IS : 9175 ( Part 15 ) - 1987 *

NORMALIZED FROM 86O’C 88~ 1050 -m 70

80 - 900 - 60

70 -

60 - 750 - g 50

y50 - 2

600 - 2 LO

$ 10 -.

W

a” u

I: L50 - : 30 a

30 - 300 : 20

20 -

- 10 - 150 10

0” O- 0

0 25 50 75 100 125 150

SECTION SIZE (mm)

;FIG. 5 EFFECT OF SECTION SIZE ON MECHANICAL PROPERTIES OF 37C15 GRADE STEEL

80

OIL QUENCHED 86O’C TEMPERED

I L REDiJCTIOkl OF' ARE/i

6OO’C AC

- 1200 +- 100

-1050 90

-.9@0 -80

..750 g -70 ;

-60 -V -600

-50

L50 -LO

-300 4-30 0 25 50 75 100 125 150

SECTION SIZE (mm )

,FIG. 6 EFFECT OF SECTION SIZE ON MECHANICAL PROPERTIES OF 37C15 GRADE STEEL

9

IS : 9175 ( Part 15 ) - 1987

1200 - 80

1050 - 70

r 900 - 60

q 750 - g !k a 50

z 600 - ij 10

ifi ,:t 450 o, - 30

300 - 20

OIL QUENCHED 860°C AC

ty--e’

I

STRENGTH 1

- 100

- 90

- 80

- 70

- 6o w

- 50 2

T - LO

- 30

- 20

- 10

- 0

0 25 50 75 100 125 150 SECTION SIZE (mm)

FIG. 7 EFFECT OF SECTION SIZE ON MECHANICAL PROPERTIES OF 37C15 GRADE STEEL

10

IS : 9175 ( Part 15 ) - 1987

( Continued from page 2 )

Panel to Collect Data on Steer ror Automobile Purpose, SMDC 31/P-12

Convener Representing

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

Members

SHRI B. K. ANANTHARAMAIH SHRI 0. B. DIAS ( Alternate )

WG Forge and Allied Industries Ltd, Thane

PROP R. C. CHATURVEDI Indian Institute of Technology, Bombay SHRI B. HARIDASACHAR Visvesvaraya Iron and Steel Ltd. Bhadravati

SHRI D. P. VERNEKAR ( Alternate ) SHRI H. A. JAISINGHANI Mahindra and Mahindra Ltd, Bombay SHRI M. G. LAWATE Tata Engineering & Locomotive Co Ltd, Pune DR V. RAMASWAMY Research and Development Centre for Iron &

Steel ( R & D Centre ) Raochi SHRI S. R. MEDIRA~TA ( Alternate )

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

DR R. D. CHAUDHARI ( Alternate )

11

INTERNATIONAL SYSTEM OF UNITS ( SI UNITS)

Base Units

Quantity

Length

Mass

Time

Electric current

Thermodynamic temperature

Luminous intensity

Amount of substance

Sopplementary Units

Quantity

Plane angle

Solid angle

Derived Units

Quantity

Force

Energy

Power

Flux

Flux density

Frequency

Electric conductance

Electromotive force

Pressure, stress

Unit

metre

kilogram

second

ampere

kelvin

candela

mole

Unit

radian

ateradian

Unit

newton

joule

watt

weber

tesla

hertz

siemens

volt

paacal

Symbol

m

kg

8

A

K

cd

mol

Symbol

rad

sr

Symbol

.N

J

W

Wb

T

Hz

S

V

Pa

Definition

1N = 1 kg,m/s*

1J = I N.m

IW = 1 J/s

1 Wb = 1 V.8

1T = 1 Wb/m*

1 Hz = 1 C/8( 8-l)

IS - 1 A/V

1v - 1 W/A

1 Pa = 1 N/ma