Abstract：In order to research the effect of refining slag on nonmetallic inclusions in high manganese steel, the effect of the MgOSiO2Al2O3CaO refining slag on nonmetallic inclusions in the FexMn high manganese steel (x=10%, 20%) was studied by slag/steel equilibrium experiments. The results show that there are two types of inclusions in the high manganese steel without top slag， MnO and MnOAl2O3. After the addition of the refining slag, the inclusions transformed to three main types, which were MnO, MnOSiO2 and MnOAl2O3MgO. Among them, the MnOSiO2 type shares the majority of the total inclusions. According to the result analyzed by the ASPEX scanning electron microscopy, the main component of inclusions in the master high manganese steel is MnO, with the mass percent above 95%, and the mass percent of Al2O3 about 4%. After reacting with the refining slag, the mass percent of MnO in the inclusions decreases, while that of SiO2 and MgO increases, especially SiO2 increases significantly. The thermodynamic calculation results show that the Gibbs free energy change of both reactions (4［Al］+3(SiO2)=2(Al2O3)+3［Si］ and 2［Mn］+(SiO2)=2(MnO)+［Si］) between the slag and the molten steel is much less than zero. It indicates that under present experimental conditions, SiO2 in the slag can be reduced by ［Al］ and ［Mn］ in the molten steel to supply ［Si］, which then reacts with ［O］ in the molten steel, leading the SiO2 content in the inclusions.
李牧明，于会香，潘明，白皓. 精炼渣对高锰钢中非金属夹杂物的影响[J]. 钢铁, 2019, 54(6): 37-42.
LI Muming，YU Huixiang，PAN Ming，BAI Hao. Effect of refining slag on nonmetallic inclusions in #br# high manganese steel. Iron and Steel, 2019, 54(6): 37-42.
