Behavior evolution of inclusions in 37Mn5 steel produced by BOF-LF-VD-CC
WANG Yi1, WANG Yi-hang2, YANG Shu-feng2
1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract:In order to explore the behavior evolution process of inclusions in 37Mn5 steel production and reduce the number of non-metallic inclusions in the steel,the steel samples at different positions were taken according to the BOF-LF-VD-CC process adopted by a domestic steel plant to produce 37Mn5 steel pipes,and the change rule of the number,size and composition of inclusions was analyzed. The results show that there are mainly two types of inclusions after LF treatment:MnS and MnS-Al2O3. Most of the inclusions after VD are MnS,Al2O3-CaO-MgO,Al2O3-CaO-MgO-CaS. Compared with LF treatment,the number density of inclusions decreased by 21.54% and the average size decreased by 57.05%.The shape of inclusions changes from irregular to spherical after VD,which indicates that VD has good refining effect. Increasing the number of inclusions in tundish may result from secondary oxidation. Mold flux with reasonable composition should be selected to improve the quality of molten steel.
王翊, 汪易航, 杨树峰. BOF-LF-VD-CC生产37Mn5钢夹杂物的行为演变[J]. 中国冶金, 2020, 30(2): 26-32.
WANG Yi, WANG Yi-hang, YANG Shu-feng. Behavior evolution of inclusions in 37Mn5 steel produced by BOF-LF-VD-CC[J]. China Metallurgy, 2020, 30(2): 26-32.
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