| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface hardened steel material producible without adversely affecting the environment, and in which the amt. of the surface to be hardened is equal to or above that by the conventional nitriding treatment or the like. SOLUTION: On the surface of steel, an Fe plated layer having a componential compsn. contg., by mass, >=0.05% C and one or two kinds of >=0.5% O and >=0.1% P, and the balance Fe with inevitable impurities is formed to control the hardness of the surface to >=500 by Vickers hardness (Hv) and also to allow compressive residual stress to exist on the surface.
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