结合生产实际，采用定量金相和SEM+EDS统计分析方法，研究了Si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含量在25%左右，夹杂物的变形能力稍弱。

Combining industrial practice, the effect of refining slag basicity on inclusion 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.