| 摘要 |
<p>In a rolling shaft relatively rolling with respect to rolling members provided in a radial needle roller bearing, the rolling shaft is composed of a steel containing 0.5 to 1.2 wt% carbon and is provided with a surface layer 3a containing 0.05 to 0.4 wt% nitrogen, having Vickers hardness being Hv650 or more through a high frequency quenching performed thereto and a residual austenite being 15 to 40 vol%, and a core portion of the rolling shaft contains 0 vol% of the residual austenite. <IMAGE></p> |
