Steels for Hardening and Tempering (IS : 5517-1969)
Designation
of Steel
Properties
in hardened and tempered condition
Normalizing
Temp.oC
Hardening
Temp.oC
Quenching
medium
Tempering
Temp.oC
Tensile
strength kgf/mm2
Yield
stress Min. kgf/mm2
C
30
60-75
40
860-890
860-890
Water
or oil
550-660
C
35 Mn 75
60-75
40
850-880
840-880
Water
or oil
530-760
C40
60-75
38
830-860
830-860
Water
or oil
550-660
C
45
60-75
38
830-860
830-860
Water
or oil
530-670
C
50
80-95
54
810-840
810-840
Oil
550-660
C
55 Mn 75
80-95
54
810-840
810-840
Oil
550-660
40
S 18
70-85
48
830-860
830-860
Oil
550-660
40
Mn 2 S 12
60-75
40
840-870
840-870
Oil
550-660
20
Mn 2
60-75
44
860-900
860-900
Water
or oil
550-660
27
Mn 2
70-85
46
840-880
840-880
Water
or oil
550-660
35
Mn 2 Mo 45
100-115
80
-
840-860
Oil
550-660
55
Cr 70
90-105
66
800-850
800-850
Oil
500-700
40
Cr 1
80-95
60
850-880
850-880
Oil
550-700
40
Cr 1 Mo 28
80-95
60
850-880
850-880
Oil
550-720
40
Cr A 1 I Mo 18
90-105
70
-
850-890
Oil
550-700
40
Ni 3
90-105
70
830-860
850-860
Oil
550-650
35
Ni 1 Cr 60
90-105
70
-
820-850
Water
or oil
550-660
30
Ni 4 Cr 1
120-135
130
-
810-830
Air
or oil
upto
250
40
Ni 2 Cr 1 Mo 28
120-135
130
-
830-850
Oil
550-660
31
Ni 3 Cr 65 Mo 55
120-135
100
-
830-850
Oil
upto
660
40
Ni 3 Cr 65 Mo 55
120-135
130
830-850
830-850
Oil
upto
660
Typical Application :
These wrought unalloyed and alloyed steels in the form of billets and bars for general engineering purposes are used
in the hardened and tempered condition.
