| 摘要 |
An inner ring and an outer ring are composed as follows. These members are fabricated with a steel for bearing containing carbon 0.6 wt% or higher. A carbonitrided layer is formed in a raceway surface. The amount of residual austenite at a position of 2% Da depth in the raceway surface is determined to be 1.0 vol% or lower. Hardness at the position of 2% Da depth is set to be HRC58 or more. Nitrogen content (Np) at the position of 2% Da depth is 0.05 wt% or more. A multiple Gd of an impression resistance expressed with the following formula (1) is 1.6 or more, <DF NUM="(1),">Gd = (H0.2/500) + 2.Np </DF> wherein in the formula, H0.2 is meant by Vickers hardness at the position of 2% Da depth. <IMAGE> |
