METHOD FOR SURFACE TREATMENT OF STEEL MEMBER

摘要

PURPOSE: To provide a steel member whose surface property and fatigue strength are improved by achieving the surface treatment where the bearing pressure to the yield stress is specified after achieving the shot peening on the surface of the steel member. CONSTITUTION: The shot peening is achieved on the surface of a steel member. The surface treatment is further achieved on the surface of the steel member by the bearing pressure of >=1/20 to <=1/2 of the yield stress. The shot peening is preferably achieved under the condition where the arc height value is >=0.40mmA. The bearing pressure in the surface treatment of the surface hardened steel member is preferably achieved based on the yield stress to be obtained as the yield stress equivalent stress (Mpa)=-337+3.40×HV, where HV is the maximum value of the Vickers hardness on the surface layer. Only fine projected parts of the surface roughness are plastically deformed to improve the surface property, and the excellent surface compressive residual stress is generated to improve the fatigue strength.