| 摘要 |
PROBLEM TO BE SOLVED: To provide an inspection method for quantitatively and simply assuring nitrogen concentration in a bearing part which has undergone a carbonitriding treatment, as well as bearing parts and a bearing in which the nitrogen concentration is quantitatively assured.SOLUTION: An inner ring 1, an outer ring 2 and a ball 3, which are the bearing parts, are formed from JIS standard SUJ2 and each have a carbonitrided layer formed on the surface. After a heat treatment at a heating temperature of 500°C and a retention time of 1 hour, the Vickers hardness of a position at a depth of 30 μm from the surface is at least 130 HV higher than the Vickers hardness of the core, which is a region where the carbonitrided layer has not been formed in the thickness direction of the bearing part. |
