| abstract |
A bearing part having long life against rolling contact fatigue, excellent in anti-crack strength and restricted in an increase of aged dimensional change, a heat treatment method thereof, and a rolling bearing including the bearing part are obtained. Steel for a bearing part is subjected to carbonitriding at a carbonitriding temperature exceeding the A 1 transformation temperature, and cooled to a temperature lower than the A 1 transformation temperature. The steel is reheated to a temperature for quenching that is not lower than the A 1 transformation temperature but lower than the carbonitriding temperature, and then quenched. |