Inclusions evolution and control of non-aluminum deoxidized GCr15 bearing steel
XIAO Wei1, BAO Yan-ping1, WANG Min1, LIU Yu2, HUANG Yong-sheng2, SUN Guang-tao2
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; 2. Special Steel Company, ZENITH Steel Group Co., Ltd., Changzhou 213000, Jiangsu, China
Abstract：Aluminum-deoxidized bearing steel often contains D and Ds inclusions, which have a negative influence on the fatigue properties of bearing steel. In order to reduce the content of these kinds of inclusions, a new smelting method with low basicity slag and non-aluminum deoxidization was adopted to smelt bearing steel in a steel mill in China. The whole smelting process was sampled, and the inclusions were characterized by means of SEM-EDS and the automatic inclusion analysis system to clarify the evolution mechanism of inclusions. The results show that the total oxygen content of the bearing steel can reach from 0.000 6% to 0.001 0%; during the smelting process, the inclusions mainly composed of silicon oxide are formed first, which then continuously react with calcium, magnesium, aluminum, and other components in the LF refining process and grow up gradually, and finally are removed in the RH refining process; eventually, the inclusions in the steel are mainly composed of small-size silicate, with few spinel and calcium aluminate. This smelting method changes the main types of inclusions in bearing steel, reduces the content of D and Ds inclusions, and reduces the influence of inclusions on the properties of bearing steel.
肖微, 包燕平, 王敏, 刘宇, 黄永生, 孙光涛. 非铝脱氧GCr15轴承钢的夹杂物演变和控制[J]. 钢铁, 2021, 56(1): 37-42.
XIAO Wei, BAO Yan-ping, WANG Min, LIU Yu, HUANG Yong-sheng, SUN Guang-tao. Inclusions evolution and control of non-aluminum deoxidized GCr15 bearing steel[J]. Iron and Steel, 2021, 56(1): 37-42.
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2021, Vol. 56 
