结合生产实际,采用定量金相和SEM+EDS统计分析方法,研究了硅脱氧条件下,精炼渣碱度对304奥氏体不锈钢在LF精炼、连铸过程夹杂物变化规律的影响.结果表明:钢水中主要形成球状CaO-Al2O3-SiO2类复合夹杂,适当高的精炼渣碱度有利于钢中细小夹杂物的形成.随精炼渣碱度的提高,复合夹杂物中CaO含量增加,SiO2含量减小,Al2O3含量变化不大.现场条件下,由FeSi合金带人钢中的Al形成的Al2O3对复合夹杂物的塑性变形影响较大.在精炼渣碱度分别为1.0和1.5时,铸坯复合夹杂物中Al2O2质量分数为25%左右,夹杂物的变形能力稍弱.
参考文献
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