120t LF精炼过程钢水吸氮量控制  

Nitrogen absorption control of molten steel in 120t LF refining process

作　　者：邓南阳[1] 孙波[1] 解养国[1] 王勇[1] 孙涛[2] 刘前芝[1] DENG Nanyang;SUN Bo;XIE Yangguo;WANG Yong;SUN Tao;LIU Qianzhi(Long Product Division of Maanshan Iron and Steel Co.,Ltd.,Maanshan 243000,China;Manufacturing Department of Maanshan Iron and Steel Co.,Ltd.,Maanshan 243000,China)

机构地区：[1]马鞍山钢铁股份有限公司长材事业部,安徽马鞍山243000 [2]马鞍山钢铁股份有限公司制造管理部,安徽马鞍山243000

出　　处：《炼钢》2023年第3期44-51,共8页Steelmaking

摘　　要：为了实现低氮钢种的稳定生产,基于氮溶解热力学和动力学理论,在结合某厂生产实践的基础上,分析了LF精炼过程中电弧特性、渣层厚度、埋弧程度、吹氩流量以及原辅料含氮质量分数对钢水增氮的影响。通过采取回收连铸热态铸余钢渣、合理选择加热过程电极档位;精确控制氩气流量、减少钢水裸露;严格控制原辅料中氮质量分数、使用优质增碳剂替代普通增碳剂、优选转炉入炉废钢等措施,钢水增氮质量分数分别从优化前的0.00144%、0.00115%、0.00135%降低至0.00052%、0.00049%、0.00011%,精炼过程钢水总增氮质量分数由优化前0.00394%降低到0.00112%,LF终点氮质量分数可控制在0.00450%以内。In order to realize the stable production of low nitrogen steel,based on the theory of nitrogen dissolution thermodynamics and kinetics and combined with the production practice of a certain plant,the effects of arc characteristics,slag layer thickness,arc submergence degree,argon blowing flow rate and nitrogen content of raw and auxiliary materials on the nitrogen increase of molten steel in LF refining process were analyzed.The mass fraction of nitrogen increase in molten steel was respectively reduced from 0.00144%,0.00115%and 0.00135%before optimization to 0.00052%,0.00049%and 0.00011%respectively by taking measures such as recovery of hot steel and slag,reasonably using the electrode gear in the heating process,accurately controlling the argon flow,reducing the exposure of molten steel,strictly controlling the mass fraction of nitrogen in raw and auxiliary materials,using high-quality carburizing agent instead of ordinary carburizing agent,and optimizing the waste steel entering the converter.The total nitrogen increase mass fraction of molten steel in refining process decreased from 0.00394%before optimization to 0.00112%,and the mass fraction of nitrogen at the end of LF could be controlled within 0.00450%.

关 键 词：LF精炼 低氮 增氮 热力学 动力学 

分 类 号：TF769.2[冶金工程—钢铁冶金]