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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.