| 摘要 |
PURPOSE:To impart high resistance force against the formation of abnormal carburization structure to a case hardening steel by specifying the contents of C, Si, Mn, Cr, Al, and Cu in the basic components in the case hardening steel to be used for parts for structural purposes, etc. CONSTITUTION:The compsn. of the case hardening steel is specified, by weight, 0.1-0.4% C, <0.15% Si, <=12% Mn, <=1.5% Cr, <=0.07% SolAl, 0.02-0.5% Cu, and the balance Fe and unavoidable impurities. If necessary, >=1 kinds among <=5.0% Ni, <=2.5% Mo and <=0.005% B and >=1 kinds of <=0.15% Nb and <=0.15% V are incorporated therein. Since the case hardening steel having such compsn. is less forced with the abnormal carburization structure, the steel can impart a high degree of fatigue strength, rolling fatigue strength and wear resistance to parts for machine structural purposes when used under severe conditions.
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