Abstract：The problem of increasing of gas and inclusions in molten steel was caused by the solidified crust of refining slag during the production of the GCr15 bearing steel. The effect of the chemical composition，melting conditions and microstructure on solidified crust was studied by chemical analysis，melting test，SEM and XRD of the industrial refining slag. The results showed that the crust composed primarily of calcium aluminates，calcium oxide，magnesium-aluminium spinel，and dicalcium silicate. The bond of calcium aluminates crystals was strengthened，which made the refining slag crusted caused by numerous high melting point precipitates of calcium oxide，magnesium-aluminium spinel and dicalcium silicate precipitate ahead of the low melting point calcium aluminates，and enriched the low melting precipitates. Solidified crusts can be prevented by reducing the precipitation of high melting point phase during cooling process when the refining slag composition is optimized in the range of low melting point area in CaO-SiO2-Al2O3-MgO phase diagram.
刘志宏，张兴中. GCr15轴承钢精炼渣结壳机理[J]. 钢铁, 2015, 50(6): 46-50.
LIU Zhi-hong，ZHANG Xing-zhong. Solidified crust mechanism of refining slag for GCr15 bearing steel. Iron and Steel, 2015, 50(6): 46-50.
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2015, Vol. 50 
