1. preheating treatment: the bearing is a part, which can be divided into inner ring, outer ring, rolling body and support frame according to the parts. The inner ring, the outer ring and the rolling elements are made of bearing steel. Generally, the heat treatment process includes stress relief annealing after forging, spheroidizing annealing and stress relief annealing after machining. Precision grade bearings have homogenization annealing and dehydrogenation annealing.

2. Final heat treatment: General bearing steel is usually quenched and tempered at low temperature; Carburized bearing steel must be carburized and quenched and tempered at low temperature; High temperature quenching and tempering of high temperature bearing; Precision bearings are quenched+low temperature tempering+cold treatment, and some are quenched+low temperature tempering+additional tempering.

The preheating treatment is arranged before machining, and the final heat treatment is arranged after machining and before grinding.