STEEL FOR SURFACE HARDENING FOR MACHINE STRUCTURAL USE AND STEEL COMPONENT FOR MACHINE STRUCTURAL USE AND PROCESS FOR PRODUCING SAME

摘要

A steel for surface hardening for machine structural use which is characterized by containing, in terms of 5 mass%, 0.30-0.60% C, 0.02-2.0% Si, 0.35-1.5% Mn, 0.001- 0.5% Al, 0.05-2.0% Cr, 0.001-1.0% Sn, 0.0001-0.021% S, 0.0030-0.0055% N, 0.01-2.0% Ni, 0.01-2.0% Cu, up to 0.030% P, and up to 0.005% 0, with the remainder comprising Fe and incidental impurities, the contents of 10 Sn, Cu, Ni, Mn, and S satisfying relationships (1) and (2) . -0.190.12xSn+Cu-0.1xNi0.15 (1) 60Mn/S300 (2)