精炼渣碱度对304不锈钢夹杂物的影响

来源期刊：钢铁2010年第12期

论文作者：李双江 姜周华 黄宗泽 李阳 李明

文章页码：26 - 29

关键词：精炼渣碱度； 硅脱氧； 夹杂物； 304不锈钢

Key words：refining slag basicity； deoxidation by silicon； inclusion； 304 stainless steel

摘    要：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合金带入钢中的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Al₂O₃质量分数为25%左右,夹杂物的变形能力稍弱。

Abstract: Combining industrial practice,the effect of refining slag basicity on inclusions in Si-killed 304 austenitic stainless steel during LF refining and continuous casting process was researched with quantitative metallography and SEM+EDS statistical analytical methods.The results show that the spherical CaO-Al₂O₃-SiO₂ compound inclusion is mainly formed in molten steel,and properly higher basicity is beneficial to smaller inclusions formation.With refining slag basicity increasing,the CaO content in compound inclusion increases gradually together with SiO₂ content reducing,and the variation of Al₂O₃ content is slight.In industrial process,the containing Al in FeSi alloy is a mainly factor for Al₂O₃ inclusion formation.When the refining slag basicity is controlled at 1.0 and 1.5 respectively,the Al₂O₃ content is about 25% in casting billet,and the deformability of inclusion is feeblish accordingly.