304不锈钢不同精炼渣碱度下夹杂物的演变

 为了提高304不锈钢的产品质量，结合生产实际，利用热力学计算和扫描电镜能谱分析方法, 研究了硅脱氧条件下，LF精炼渣碱度对304不锈钢在LF精炼、连铸过程夹杂物变化规律的影响。试验结果表明,随着冶炼过程进行，全氧质量分数和夹杂物数量依次减小。304不锈钢采用1.75高碱度炉渣，可以得到较低的全氧质量分数和夹杂物数量，但是夹杂物中Al2O3质量分数高，夹杂物熔点高。采用1.53低碱度炉渣，钢液中全氧质量分数较采用高碱度炉渣高，但是夹杂物中CaO、Al2O3质量分数相对较低，SiO2和MnO质量分数较高，夹杂物熔点低。针对304不锈钢产品可以采用不同的生产工艺路线来满足产品的不同需求。

Inclusion evolution of 304 stainless steel produced with #br# different LF refining slag basicity

In order to improve product quality of 304 stainless steel, the effect of LF slag basicity on inclusions in the Si killed 304 austenitic stainless steel during the LF refining and continuous casting process was researched using SEM+EDS analytical methods and thermodynamic calculations combining with industrial practices. The results showed that the mass percent of total oxygen and the inclusion density decrease throughout the process. A high basicity slag of 1.75 can obtain a lower mass percent of total oxygen and inclusion density, but a higher mass percent of Al2O3 of inclusion and melting temperature. A low basicity slag of 1.53 results in a higher total mass percent of oxygen compared with a high basicity slag, but lowers the mass percent of Al2O3 and CaO in inclusions and raises the mass percent of SiO2 and MnO in inclusions, lowering the melting temperature of inclusions and improving the deformability of inclusions. For 304 stainless steel products, different production processes can be adopted to meet product requirements.