Patent ID: 6413328
Filing Date: 2002-07-02
Classification: C23C,F16C

Abstract:
A high surface pressure resistant steel part containing a fine nitride and/or carbonitride which is dispersed only in a surface structure extending from the surface to a depth of 1 mm below the surface having an average grain size of 0.3 &mgr;m or less in an amount of 1% by volume or more and containing a carbide mainly composed of cementite having an average grain size of 3 &mgr;m or less which is dispersed in an amount up to 30% by volume and having a multi phase structure composed of martensite as a parent phase which is finely divided into pieces by said dispersed substance and further containing 20 to 80% by volume residual austenite in said multi phase structure and containing 1.1 wt. % or more carbon in its surface.