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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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