In order to meet the above requirements for the performance of the dynamic bearing, the following basic performance requirements are proposed for the bearing steel material:
1) high contact fatigue strength,
2) After heat treatment, it should have high hardness or hardness that can meet the bearing performance requirements.
3) high wear resistance, low friction coefficient,
4) high elastic limit,
5) good impact toughness and fracture toughness,
6) good dimensional stability,
7) good rust resistance,
8) Good cold and hot processing properties.
According to the above basic requirements for bearing steel, the following basic requirements are imposed on the metallurgical quality of bearing steel:
1 strict chemical composition requirements;
2 Higher dimensional accuracy requirements, for the use of hot-rolled annealed bar forging on high-speed upsetting machines, the dimensional accuracy should be higher;
3 particularly strict purity requirements;
4 strict low-fold tissue and microscopic (high magnification) tissue requirements;
5 particularly strict surface defects and internal defects requirements: surface defects include surface cracks, surface slag, burrs, folds, crusting, oxide scales, etc.; internal defects include shrinkage cavities, bubbles, white spots, overburning, severe looseness And segregation, microscopic pores, etc.;
6 strict carbide non-uniformity requirements;
7 strict surface decarburization depth requirements;
8 Other requirements: for example, the smelting method of bearing steel, oxygen content, annealing hardness, fracture, residual elements, spark inspection, delivery status, etc.https://www.supplyforever.com/