40NiCrMo7 Steel

Steel name: 40NiCrMo7
Table No.: 1909
DIN designation: 40NiCrMo8
AISI/SAE designation: 4340
EN designation: 40NiCrMo7
UNI designation: 40NiCrMo7
BS designation: 817M40
GOST designation: 40HN2M
Chemical composition in weight %: 0.37-0.44% C, 0.15-0.40% Si, 0.50-0.80% Mn, max. 0.035% P, max. 0.035% S, 0.60-0.90% Cr, 0.20-0.30% Mo, 1.60-1.90% Ni
Steel group: Alloy steels
Applications: No data
Comment: Ac1=728, Ac3=770 C, Ms=300 C, Mf=80 C.
Reference: Not shown in this demo version.

Heat Treatment
Quenching: 850 C/oil, polymer
Tempering: 660-650 C/air

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