Abstract：Bearing steel manufacturers should pay attention not only to the inspection quality of their own products, but also to steel application experience of the downstream users and end users. Fatigue life is a more effective evaluation index for the performance of bearing steel. The rolling contact fatigue (RCF) and rotating bending fatigue (RBF) test results of bearing steels produces by Jiangyin Xingcheng Special Steel (JYXC) showed that inclusions were main factors affecting fatigue life of high carbon bearing steel. Increase of inclusion size in steel and aggregation of inclusions in the center caused by segregation would accelerate fatigue failure. By controlling casting liquid steel superheat and matching with soft reduction process, central defect of continuous casting steel could be improved, and probability of fatigue failure of steel due to the heredity of center segregation could be reduced. By changing the shape of tundish to optimize liquid steel flow during pouring process, number of B and DS type inclusions and total oxygen content in steel that were sensitive to fatigue damage of bearing steel were decreased, and total number of inclusions was also reduced, which was conducive to improving steel fatigue life. It is still main work direction of JYXC for a long time in the future to improve steel cleanliness and homogeneity in steelmaking process for improving bearing steel fatigue life.
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2020, Vol. 30 
