Steel for carburized gear

Details Steel for carburized gear Steel for carburized gear

C - Chemistry, Metallurgy

22

C

C22C 38/60 (2006.01) C21D 6/00 (2006.01) C21D 9/32 (2006.01) C22C 38/00 (2006.01) C22C 38/48 (2006.01)

Patent

CA 2137744

A steel for carburized gear having softening resistance, consisting essentially of, in weight percentages, 0.18 to 0.25% C, 0.45 to 1.00% Si, 0.40 to 0.70% Mn, 0.30 to 0.70% Ni, 1.00 to 1.50% Cr, 0.30 to 0.70% Mo, up to 0.50% Cu, 0.015 to 0.030% Al, 0.03 to 0.30% V, 0.010 to 0.030% Nb, up to 0.0015% O, 0.0100 to 0.0200% N and the balance consisting of Fe and inevitable impurity elements, wherein quenching at 820°C or higher after carburization does not cause any ferrite to be formed in a hardened structure of the core part of the carburized steel, and wherein, while tempering is generally performed at 160 to 180°C after the quenching, reheating at any of temperatures inclusive of the tempering temperature and up to 300°C does not cause the hardness of a carburized case of the carburized steel to decrease by HV 50 or more from the one after the carburization, quenching and tempering.

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