| 摘要 |
A rolling bearing element is made of a continuously cast bearing steel, and the center segregation rate of carbon, C/C0 of the bearing steel material satisfies a condition, 0.9 </= C/C0 </= 1.1, where C is the concentration of carbon (wt.%) in a center portion and C0 is the average concentration of carbon (wt.%). The center segregation rate for sulphur additionally or alternatively satisfies an equivalent condition. The bearing steel contains up to 10 ppm of oxygen, and up to 80 ppm of sulphur. <IMAGE> |
