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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。
According to the actual production, the influence of refining slag alkalinity on the variation of inclusions of 304 austenitic stainless steel during LF refining and continuous casting was studied by means of quantitative metallography and SEM + EDS statistical analysis. The results show that spherical CaO-Al2O3-SiO2 composite inclusions are mainly formed in the molten steel, and proper high basicity of refining slag is beneficial to the formation of small inclusions in steel. With the increase of basicity of refining slag, the content of CaO in composite inclusions increased, while the content of SiO2 decreased, while the content of Al2O3 changed little. In the field, Al2O3 formed by Al brought into the steel by FeSi alloy greatly affects the plastic deformation of the composite inclusions. When the basicity of refining slag is 1.0 and 1.5 respectively, the mass fraction of Al2O3 in the slab composite inclusions is about 25%, and the deformation ability of the inclusions is weaker.