超低碳IF钢氧化物夹杂控制工艺  

Control process of oxide inclusions in ultra-low carbon IF steel

作　　者：陈利 杨柳 杜国利 韦瑞宝 陈永金 刘崇林 CHEN Li;YANG Liu;DU Guoli;WEI Ruibao;CHEN Yongjin;LIU Chonglin(Steelmaking Plant,Liuzhou Iron and Steel Corp.,Liuzhou 545002,China;Science and Technology Quality Center,Liuzhou Iron and Steel Group Co.,Ltd.,Liuzhou 545002,China)

机构地区：[1]柳州钢铁股份有限公司转炉炼钢厂,广西柳州545002 [2]柳州钢铁集团公司科技质量中心,广西柳州545002

出　　处：《炼钢》2024年第6期75-82,共8页Steelmaking

摘　　要：为提高超低碳IF钢连铸可浇性和洁净度,开展了转炉底吹工艺优化、终点碳氧含量控制、顶渣改质、真空高效深脱碳技术和连铸保护浇铸工艺试验研究。结果表明:采用环缝式风口替代原有毛细管式透气砖底吹,转炉后期单管底吹强度0.086 m^(3)/(t·min),搅拌能0.40 W/t,能显著提高吹炼后期搅拌能力,转炉终点钢水平均碳氧积达0.00209。通过RH快速抽真空至极限真空度,3~5 min强制吹氧和8~12 min极限真空度下脱碳效率最高。降低真空脱碳后钢水残余氧含量、优化钢包顶渣成分,可显著减少Al_(2)O_(3)夹杂物的产生,促进顶渣对夹杂物的吸附和溶解,配合连铸保护浇铸,钢水可浇性和氧化物夹杂控制水平明显提升。In order to improve the castability and cleanliness of ultra-low carbon IF steel in continuous casting,the optimization of converter bottom blowing process,carbon and oxygen contents control at the endpoint,top slag modification,efficient vacuum deeper decarburization technology and enhancing protection of casting process were carried out.The results showed that using the annular-tubes type bottom nozzle instead of the original capillary type gas permeable brick bottom blowing,the single tube bottom blowing intensity 0.086 m^(3)/(t·min),and the stirring energy 0.40 W/t,which could significantly improve the stirring capacity in the later stage of blowing.The average carbon and oxygen product of the molten steel at the endpoint of the converter reached 0.00209.The vacuum was rapidly pumped to the limit vacuum degree,and the vacuum decarburization efficiency was the highest at 3-5 min forced oxygen blowing stage and holding 8-12 min under limit vacuum degree.Reducing the residual oxygen content after vacuum decarburization and optimizing the top slag composition of ladle could significantly reduce the Al_(2)O_(3) inclusion formation and promote the adsorption and dissolution of inclusions by top slag.With the protection of continuous casting,the control level of oxide inclusion and pouring ability of molten steel has been significantly improved.

关 键 词：超低碳IF钢 夹杂物 可浇性 全氧 

分 类 号：TF762[冶金工程—钢铁冶金]