结晶器电磁搅拌电流对铝镇静钢中夹杂物去除的影响  

Effect of Mold Electromagnetic Stirring Current on Removal of Inclusions from Aluminum-Killed Steel

作　　者：赵显久[1,2,3] 张捷宇 许晋[3] ZHAO Xianjiu;ZHANG Jieyu;XU Jin(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China;Research Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 200941,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [3]宝钢股份有限公司中央研究院,上海200941

出　　处：《上海金属》2022年第2期84-92,97,共10页Shanghai Metals

基　　金：宝钢科研项目(K21ZGAB068)。

摘　　要：针对超低碳铝镇静钢的不同处理阶段,即从精炼、中间包、结晶器到铸坯不同位置进行在线取样。采用扫描电子显微镜和能谱仪分析试样中夹杂物的类型及尺寸,结合钢包顶渣变化及连铸生产情况分析夹杂物的来源。对比分析了结晶器电磁搅拌的电流(400和500 A)对铝镇静钢中夹杂物去除的影响。研究表明:精炼处理后夹杂物以脱氧产物Al_(2)O_(3)为主,并伴有CaO夹杂,CaO来源于钢包顶渣与钢液中[Al]_(sol)的反应。中间包内夹杂物仍以Al_(2)O_(3)为主,复合少量MgO,后者源自中间包衬的侵蚀。与400 A搅拌电流相比,500 A搅拌电流下弯月面卷渣较多,但大尺寸的Al_(2)O_(3)夹杂物减少。According to the different treatment stages of ultra-low carbon aluminum-killed steel,samples were taken from different treatment positions such as refining,tundish,mould and billet.The type and size of inclusions in the samples were analyzed by scanning electron microscope and energy dispersive spectrometer,and the sources of inclusions were analyzed in combination with the change of ladle top slag and continuous casting production.The effects of electromagnetic stirring current(400 and 500 A)on removal of inclusions from aluminum-killed steel were compared and analyzed.It was found that the inclusions after refining were mainly deoxidized product Al_(2)O_(3),accompanied by CaO inclusions,which originated from the reaction between ladle top slag and[Al]_(sol) in molten steel.The inclusions in the tundish were still mainly Al_(2)O_(3) with a small amount of MgO which originated from the erosion of tundish lining.Compared to the stirring current of 400 A,there were more slags on the meniscus under the stirring current of 500 A,but the large-scale Al_(2)O_(3) inclusions were reduced.

关 键 词：铝镇静钢 连铸 电磁搅拌 夹杂物 

分 类 号：TF76[冶金工程—钢铁冶金] TF704.7