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IS 9175-12 (1988): Rationalized steels for the automobileand Ancillary Industry, Part 12: Mechanical and PhysicalProperties of 35 Mn6Mo3S15 [MTD 16: Alloy Steels andForgings]

IS: 9175 ( Part 12 ) - 1988

Indian Standard

SPECIFICATION FOR -. \ J' RATIONALIZEDSTEELSFORTHEAUTOMOBILE ANDANCILLARYINDUSTRY

PART 12 MECHANICAL AND PHYSICAL PROPERTIES OF 35Mn6Mo3S15

UDC 669.14 : 006.015*2*629*113

4$ Copyright 1989

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Gr 2 j-he 1989

IS r 9175 (Part 12 ) - 1988

Indian Standard

SPECIFICATION FOR RATIONALIZED STEELS FOR THE AUTOMOBILE

AND ANCILLARY INDUSTRY PART 12 MECHANICAL AND PHYSICAL PROPERTIES OF 35Mn6Mo3S15

O.FOREWORD

0.1 This Indian Standard ( Part 12 ) was adopted 0.2 Part 1 of this standard was published in 1979 by the Bureau of Indian Standards on 5 May which covers the chemical composition of 33 1988, after the draft finalized by the Coordinating rationalized steels. The mechanical properties, Committee on Materials for Automobiles Sectional hardenability and isothermal transformation Committee had been approved by the Structural characteristics of these 33 rationalized steels are and Metals Division Council. being covered in-different parts of this standard

(Parts2to34).

1. SCOPE

1.1 This standard covers the chemical composi- tion, mechanical properties, hardenability and isothermal transformation characteristics of 35Mn6Mo3S15 grade of steel for use by t.he automobile and ancillary industry.

2. CHEMICAL COMPOSITION

2.1 The chemical composition of this grade of steel shall be as given in Table 1.

3. HARDNESS

3.1 The maximum hardness for this grade of steel delivered in the annealed or normalized con-

dition, determined in accordance with IS : 1500- 1983*, shall be 220 HB.

4. MECHANICAL PROPERTIES

4.2 The mechanical properties of this grade of steel ( in the hardened and tempered condition ), when determined in accordance with IS : 1598 1960t and IS : 160&1972$ shall be as given in Table 2.

4.2 The media of quenching is oil to attain the properties specified in 4.1.

*Method for Brine11 hardness test for steel (first revision ) .

iMethod for Izod impact test of metals ( jrst revision ). iMethod for tensile testing of steel products (Jizst

revision ) .

TABLE 1 CHEMICAL COMPOSITION

( Clause 2.1 )

CONSTITUENT, PERCENT r---------- --------h--_--___ ----------7

c Si MU MO S P

0’30-0’40 0’15-0.35 1’30-1.80 O-20-0.35 0’12-0’20 0’060, Max

TABLE 2 MECHANICAL PROPERTIES

( ClUUS8 4.1 )

LIMITIN.

RULING SECTION mm

150

100

63

30

TENSILE

STHMEFH

700-850

780-930

850-l 000

950-l 100

0.2 PERCENT P~cor STRESS

MPa, Min

525

585

680

740

ELOXGATION PERCENT

Min,

5’654 - So

14

12

12

10

1~0~ IMPACT HARDNESS 3, &fin BHN

55 201-255

50 223-277

50 248-302

45 269-33 1

1

IS t 9175 ( Part 12 ) - 1988

5. HOT WORKING AND HEAT TREAT- 6. TRANSFORMATIONCHARACTERISTICS MENT TEMPERATURE

6.1 The isothermal transformation diagram for 5.1 The recommended hot working and heat this grade of steel is shown in Fig. 1. treatment temperatures shall be as given below: 7. EFFECT OF TEMPERING ON

Forging rolling temperature

Annealing temperature

Normalizing temperature

1 25O”C, Max MECHANICAL PROPERTIES

840/860°C 7.1 The curves for effect of tempering on mechanical properties of steel are given in Fig. 2

840/860% and 3.

Sub-critical annealing temperature 64OJ66O”C 8* EFFFCT OF SECT1oN ‘IZE ON MECHANICAL PROPERTIES

Hardening temperature 840/86O”C 8.1 The curves for effect of section size on mech-

Tempering temperature 66O”C, Max anical properties are given in Fig. 4 and 5.

Chemical Composition, Percent r---------- *----- -__-- ----7

C 0’33 0%

Mll s Ni Cr 1’48 O-028 O&3 0’26 0’16

Basic open hearth steel Grain size 5-6 Austenitized at 845°C for 30 min

600

1 2 510 2010 2 5 102OLO 2 ‘51020

s lmin lh ldry

DURATION OF ISOTHERMAL TREATMENT

FIG. 1 ISOTHERMAL TRANSFORMATION DIAGRAM OF 35Mn6Mo3S15

2

IS:9175 (Pa rrt 12 ) - 1988

Fm. 4

110

E 100

t 90 fY

; 80

y 70

p 60

E 50

Typical Curves

Bars, oil quenched 85OQ tempered at 600°C

60 c

120

r F 110

I 80 90, 70 100 g

2 -l

LO

1 60 30 50 20

C 10

Q Q .25 50 75 100 125 150

SECTION SIZE IN mm '

CURVES SHOWING THE EFFECT OF SECTION SIZE ON MECHANICAL PROPERTIES OF 35Mn6Mo3S 15 GRADE STEEL

1LO

130 3

120 -

2 2 110 -

0, 100 -

90 -

80 -

70 -1

Typical Curves

Bars, oil quenched 850’S, tempered at 600°C

% 70

2 5 60

is! w 50 a

32

16 SECTION SIZE IN mm

FIG, 5 CURVPS SHOWING THE EFFECT OF SECTION SIZE ON MECHANICAL PROPERTIES OF 35Mn6Mo3S15

4

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