CaO-SiO2-Al2O3-CaF2系精炼渣对钢绞线用 SWRH82B钢中D类夹杂物的控制研究

通过钢渣平衡实验研究，分析了精炼渣成分对82B钢液T.O和点状不变形夹杂物成分的影响；通过Fact-Sage热力学计算，得出硅锰脱氧82B钢中MgO·Al₂O₃尖晶石夹杂的生成条件.结果表明:降低精炼渣碱度、提高Al₂O₃含量均利于钢水全氧含量的降低；随着Al₂O₃含量的提高，复合氧化物夹杂的熔点升高.当熔渣碱度为0.93、Al₂O₃含量为5.1%时，夹杂物熔点最低；熔渣碱度为1.14、Al₂O₃含量为25.6%时，高Al₂O₃活度的熔渣导致MgO·Al₂O₃尖晶石夹杂生成；熔渣碱度为1.97、Al₂O₃含量为25.9%时，由于碱度升高，钢中无MgO·Al₂O₃尖晶石类夹杂物生成；熔渣碱度为0.93、Al₂O₃含量为5.1%时，由于Al₂O₃含量降低，钢中无MgO·Al₂O₃尖晶石类夹杂物生成，且夹杂物熔点较低. 

Study on the control of D inclusion in the SWRH82B steel by CaO-SiO2-Al2O3-CaF2 refining slag

The effect of refining slag on the total oxygen content and D class inclusions in SWRH82B steel was studied by laboratory slag/steel reaction equilibrium experiments; The formation conditions of MgO·Al₂O₃ spinel inclusions is explained from chemistries of molten steels and slag compositions by Fact-Sage software. The results show that low basicity and high Al₂O₃ content of refining slag is beneficial to the removal of D class inclusions; The melting point of primary style composite oxide inclusions become higher while basicity and Al₂O₃ content of refining slag is getting increase. Melting point get to lowest when basicity and Al₂O₃ content is 0.93 and 5.1% respectively; Compare with controlled trial, MgO·Al₂O₃ spinel inclusions exist in steel when basicity and Al₂O₃ content of slag is 1.14 and 25.6% respectively.