Designation of Steel	Properties in hardened and tempered condition		Normalizing Temperature oC	Hardening Temperature oC	Quenching medium	Tempering Temperature oC	Typical Applications
	Tensile strength kgf/mm2	Yield stress Min. kgf/mm2
C 30	60-75	40	860-890	860-890	Water or oil	550-660	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.
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

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