以铝镇静钢为研究对象,在120t钢包内分别进行了镁处理和钙处理试验,对比了钢中夹杂物的成分、形貌、尺寸和分布.结果表明:镁处理试验炉次TO的去除率超过50％,钙处理炉次仅为30％,证明镁处理净化钢液效果更为明显;镁处理可将Al2O3迅速变质为尖晶石或MgO,夹杂物分布弥散,尺寸细小且基本不随时间延长而增大;钙处理对夹杂物的变质速度稍慢,夹杂物数量先增加后降低,尺寸降低不明显.界面理论计算表明,在同一体系内,将Al2O3变质为尖晶石比变质为铝酸钙具有更低的界面自由能,即镁处理可获得比钙处理更小的夹杂物尺寸,证明了精炼过程中夹杂物成分控制的重要性.
Mg treatment and Ca treatment tests were done in 120 t ladle using the low carbon Al-killed steels.The compositions,morphology,size and distribution of inclusions in the experimental steels were compared.The results show that TO removal ratio is 50％ in Mg-treated heats,but the value is only 30％ in Ca-treated heats.Mg treatment has better cleaning efficiency for liquid steels comparing with Ca treatment.Mg treatment can rapidly modify Al2O3 to dispersive sipnel or MgO with small size,also the size of inclusions almost does not increase with time.However,Ca treatment has the lower reaction rate than Mg treatment.The number of inclusions increases firstly and then decreases with time,but the size of inclusions reduces insignificantly.The calculation results using interface theory show that the free energy of Al2O3 changing to sipnel is lower than Al2O3 changing to calcium-aluminate,Mg treatment can obtain the smaller inclusion size,which also proves the importance of composition control for inclusions during steel refining.
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