为改进超纯铁素体不锈钢的脱氧工艺,提高夹杂物控制水平,在硅钼高温电阻炉内对钛稳定超纯铁素体不锈钢的精炼过程进行了试验研究.结合热力学计算,研究了不同Si、A1含量(质量分数,下同)比值的硅铝合金的脱氧效果,以及脱氧、钛合金化和钙处理后钢中典型夹杂物的组成和形貌及粒度分布.结果表明:钢中初始氧含量相近的条件下,硅铝合金复合脱氧的钢中酸溶铝、全氧量与纯铝脱氧结果相近.硅铝复合脱氧后钢中夹杂物主要为(MgO-)Al2O3-SiO2复合脱氧产物.钛合金化后夹杂物的类型主要为Al2O3-MgO(SiO2)-TiOx复合夹杂物和TiN.钙处理后的夹杂物主要为球形的MgO-Al2O3-CaO-SiO2-TiOx类复合氧化物.采用硅铝合金复合脱氧比纯铝脱氧钢的夹杂物的总数量、总面积和平均粒径均要小.
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