1.The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 2.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 3.Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
Abstract：Abstract:The effects of calcium treatment on characteristics of inclusions and precipitation mechanism of sulfide inclusions in the finished nonoriented silicon steel were analyzed through sampling and thermodynamic calculations. The results show that the detrimental inclusions larger than 3μm are mainly AlN, MgO-SiO2, CaO-Al2O3-SiO2 and their complex precipitates with MgS, MnS, CaS. No Al2O3, SiO2 and calcium aluminates inclusions were observed in the calcium treated steel. Liquid 3CaO·Al2O3, MgO·SiO2 and solid Al2O3 inclusions were absorbed by the refining slag, which aims to modifying and removing large Al2O3 inclusions. The main oxide inclusions were Al2O3-SiO2 bearing CaO and (or) CaS which were larger than 3μm after calcium treatment. The precipitation of sulfides on the surface of MgO-SiO2 type oxides made the morphology of the oxides more regular. AlN inclusions with different morphologies in the steel were multiscale distributed. Calcium treatment had no effect on the precipitation of large AlN inclusions. The precipitation and orienteering growth of oxysulfides and their complex precipitating with AlN related with the crystal structure of the oxysulfides. Sulphide capacity of oxides determined the tendency of the oxides combining with sulphide. CaS only partly wrapped with oxide core, or locally distributed on the surface of oxides in the calcium treated steels.
朱诚意1,2，黄罗翼1,2，罗小燕1,2，刘玉龙1,2，汪勇1,2，李光强1,3. 钙处理对成品无取向硅钢夹杂物特性的影响[J]. 钢铁研究学报, 2020, 32(2): 117-128.
ZHU Cheng-yi1,2,HUANG Luo-yi1,2,LUO Xiao-yan1,2,LIU Yu-long1,2,WANG Yong1,2,LI Guang-qiang1,3. Effect of calcium treatment on characteristics of inclusions in finished non-oriented silicon steel. JOURNAL OF IRON AND STEEL RESEARCH , 2020, 32(2): 117-128.