| 摘要 |
<p>A rolling bearing includes a rolling element made of a steel containing 0.9 to 1.1 wt.% C, 0.1 to 0.5 wt.% Si, 0.2 to 0.8 wt.% Mn, 1.0 to 1.8 wt.% Cr, with the balance being Fe and inevitable impurities. In the rolling bearing at least the surface of the rolling element includes carbides having an area fraction of 5% to 15%; of these carbides, carbides having an averaged particle diameter of 0.5Ám or less share 50% or more of the area fraction of all the carbides; and of the carbides, carbides having an averaged particle diameter of 1Ám or more share 2% or less of the area fraction of all the carbides; and wherein the rolling element has a Vickers surface hardness HV of 750 to 900. Preferably there is 6% or less of retained austenite in the rolling element and it has a surface roughness of 3Ám RMS or less.</p> |
