太钢VOD冶炼超纯铁素体不锈钢的工艺技术进步

Process Technology Development of Smelting Ultra Purity Ferritic Stainless Steels With VOD in TISCO

阐述了超纯铁素体不锈钢的超低碳氮的特点及其熔体降碳去氮困难的原因,利用真空降碳去氮的理论结合这方面的研究成果分析和讨论了影响VOD脱碳脱氮的影响因素,并利用VOD现场冶炼的具体数据进行了这些因素的统计分析,在此基础上提出了提高真空度、加强底吹氩搅拌强度、提高入炉钢液温度、提高入炉碳含量和降低入炉氮含量、增加VOD吹氧脱碳时的供氧量、高真空吹氩纯沸腾工艺、选用无碳、或低碳还原料等工艺技术措施,最后介绍了太钢这几年在VOD冶炼超纯铁素体不锈钢采取上述措施后所取得的效果。

The properties of ultra purity ferritic stainless steels and the difficulty of carbon and nitrogen removal from its molten steel were expounded. Based on the thermodynamic theory and the research results , the influence factors of decarburization and denitrogenization in VOD were discussed, and the smelting data in spot was statistically analyzed. Lastly, the modified process measures, such as controlling-high vacuum, strongly blowing argon from bottom, increasing the temperature of the liquid steel into VOD, raising carbon content and decreasing nitrogen content of molten steel into VOD, strengthening blow-oxygen volume during decarburization, completely blowing argon process in high vacuum and choosing low carbon or no carbon material and so on, were presented for smelting ultra purity stainless steels in VOD and the development after adopting the technology was introduced in TISCO.