超低碳钢方坯连铸钢水关键精炼工艺研究  

Study on key refining process of ultra-low carbon steel for billet continuous casting

作　　者：张志明 刘志龙 周楠 任世岗 ZHANG Zhiming;LIU Zhilong;ZHOU Nan;REN Shigang(Shaoguan Iron and Steel Co.,Ltd.,BAOWU Group,Shaoguan 512123,China)

机构地区：[1]宝武集团广东韶关钢铁有限公司,广东韶关512123

出　　处：《炼钢》2018年第5期37-42,共6页Steelmaking

摘　　要：介绍了小方坯连铸超低碳钢水的转炉冶炼、LF精炼和RH真空处理的生产工艺,针对钢水可浇性差和钢中Si含量偏高问题进行工艺技术优化。试验研究表明,降低LF脱硫任务,采用少渣精炼,造渣料石灰加入量控制在6. 5~7. 5 kg/t有利于钢包顶渣改质和控制钢中[Si]含量;RH根据经验公式确定吹氧量,既能满足强制脱碳的需要又可防止钢水过氧化,破真空后用高铝渣对顶渣进行改质,控制渣中TFe质量分数小于1. 0%,并对钢水Ca处理,有效提高了钢水的可浇性,顺利实现超低碳钢小方坯连铸。The production process of converter smelting, LF refining and RH vacuum treatment for small billet continuous casting of ultra-low carbon steel was introduced. The technology was optimized against the poor castability of molten steel and the high silicon content in steel. The results showed that when the LF desulphurization task reduced, the less slag refining practice was adopted and the amount of adding lime was controlled to 6.5 - 7.5 kg/t, it would be beneficial to modifying the ladle slag and controlling the content of silicon in steel. Oxygen blowing flow in RH was ascertained according to the empirical formula, which not only met the requirement of mandatory decarburization, but also prevented the overoxidation of molten steel. When the ladle slag was modified with high aluminum slag after breaking vacuum, the mass fraction of TFe in the slag was controlled to less than 1.0 % ,and then the molten steel was treated with calcium. The castability could be effectively improved,and the ultra-low carbon steel could be successfully cast with a billet CCM.

关 键 词：超低碳钢 炉外精炼 顶渣改质 可浇性 SI含量 

分 类 号：TF777.3[冶金工程—钢铁冶金]