Flame and Induction Hardening Steels (IS : 3930-1966)
 
Designation
of Steel		 Properties in quenched & tempered condition Surface hardness obtainable HRC Hardening temperature Typical Applications
Tensile range kgf/mm2 0.2% proof stress, Min kgf/mm2 Izod impact Min kgf.m For oil quench For water quench
C 30 60-75 36 5.5 45-50 860-890 860-890 These wrought unalloyed and alloyed steels for flame and induction hardening are used when high core strength and good impact properties are required.
C 45 70-85 44 3.5 55-61 830-860 820-850
T 70 70-85 40 2.8 60-63 810-840 780-810
37 Mn 2 60-75 40 4.8 53-59 850-870 840-860
40 Mn 2 Mo 45 70-85 46 4.8 53-59 850-870 840-860
35 Mn 2 S 12 80-95 56 5.5 53-59 840-860 830-850
54 Cr 1 80-95 48 2.8 57-62 850-870 840-860
50 Cr 1 V 23 80-95 48 2.8 57-62 850-870 840-860
40 Ni 3 80-95 56 5.5 54-60 830-860 840-870
40 Ni 2 Cr 1 Mo 28 90-105 66 5.5 54-60 830-840 810-830
31 Ni 3 Cr 65 Mo 55 90-105 66 5.5 49-54 850-880 820-840