Requirements for SKF Bearing Steels Working at High Temperatures Modern technologies such as nuclear power systems, jet engines, and gas turbines often operate at temperatures ranging from a few hundred degrees to thousands of degrees. Obviously, ordinary SKF imported bearing steels cannot be used. High temperature bearing steel or other high temperature resistant materials must be used. It is generally considered that the temperature condition exceeding 120 °C is regarded as the high temperature working condition. At this time, the normal bearing steel will undergo structural changes and the yield strength will decrease, and the accuracy will be gradually lost. When the working temperature of the SKF imported bearing exceeds the tempering temperature of the SKF imported bearing material, The hardness is significantly reduced, and the hardness drops sharply when the working temperature exceeds 180 ° C, and early fatigue and wear occur quickly. The central link to ensure the accuracy and service life of SKF bearings at high temperatures is to ensure that SKF bearings have sufficient hardness and dimensional and shape stability at high temperatures. Therefore, the following requirements are imposed on high temperature bearing steels:
1) The hardness at high temperature is not lower than HRC50～56; the metallographic structure is stable;
2) Good dimensional stability at high temperature, small temperature expansion coefficient, no significant structural change, good creep resistance and low residual stress;
3) Good oxidation resistance, the formed oxide film is firmly bonded to the substrate, and has good wear resistance and fatigue strength, good thermal shock resistance, can withstand rapid temperature changes, and has good thermal conductivity;
4) Other material properties that should be available as SKF imported bearing steel.
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