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利用FactSage热力学软件计算了CaO-Al_2O_3-SiO_2-5%MgO四元系的CaO、Al_2O_3等活度线,通过等活度线图着重探讨精炼渣碱度、w(CaO)/w(Al_2O_3)、MI指数(曼内斯曼指数)与Al_2O_3夹杂吸附能力的影响关系,最终得到适用于杭钢生产齿轮钢(8620H)的LF精炼渣系范围为:CaO质量分数为50%~55%,Al_2O_3质量分数为25%~30%,SiO_2质量分数为10%~12%,MgO质量分数为5%~8%。并使用该渣系进行齿轮钢(8620H)工业试验,铸坯中全氧质量分数由0.001 5%降至0.001 0%,且铸坯中显微夹杂物尺寸也明显降低,由2.1降至1.5μm,每10kg铸坯中大型夹杂物质量分数由31.9下降到26.4mg,试验效果良好。
The CaO, Al_2O_3 and other activity lines of CaO-Al_2O_3-SiO_2-5% MgO quaternary system were calculated by FactSage thermodynamic software. The alkalinity, w (CaO) / w (Al_2O_3) MI index (Mannesmann index) with Al 2 O 3 occlusion adsorption capacity, finally obtained for the production of steel gear steel (8620H) of the LF refining slag range: CaO mass fraction of 50% to 55%, the quality of Al 2 O 3 The fraction is 25% -30%, the mass fraction of SiO 2 is 10% -12%, and the mass fraction of MgO is 5% -8%. The industrial test of gear steel (8620H) using the slag system reduced the oxygen content of the slab from 0.001 5% to 0.001%, and the size of the microscopic inclusions in the slab decreased obviously from 2.1 to 1.5 μm , The mass fraction of large inclusions per 10 kg slab decreased from 31.9 to 26.4 mg, the test results are good.