含Ti超低碳钢浸入式水口结瘤研究  

Study on clogging mechanism of submerged entry nozzle for Ti-bearing ultra-low carbon steel

作　　者：程淑勇 赵显久 王波[1,2] 张捷宇[1,2] CHENG Shuyong;ZHAO Xianjiu;WANG Bo;ZHANG Jieyu(School of Material Science and Engineering,Shanghai University,Shanghai 200444,China;State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China;China Baowu Steel Group 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]中国宝武钢铁集团有限公司,上海200941

出　　处：《炼钢》2020年第5期58-62,68,共6页Steelmaking

摘　　要：对某钢厂含钛超低碳钢连铸过程所用结晶器浸入式水口结瘤问题进行了研究,采用XRF、SEM-EDS等方法分别对水口上部内壁和底部出口处结瘤物的成分、物相进行了分析,利用Factsage热力学软件计算了造成结瘤的夹杂物析出条件。研究结果表明:水口上部内壁的结瘤物主要为Al2O3夹杂物和冷钢,并且结瘤物存在明显的分层现象;水口底部出口堵塞是由于上部内壁结瘤物在钢液冲刷下吸附在底部出口,进而引起冷钢堆积造成的,并由此提出一个"结瘤-冲刷-堆积-堵塞"的水口堵塞模型来描述这个过程。A problem of nozzle clogging in submerged entry nozzle(SEN)used in the continuous casting process of Ti-bearing ultra-low carbon steel was studied.Experimental analysis methods like XRF and SEM-EDS were used to analyze the composition and phase of the nodule in the upper inner wall and inside the bottom of the SEN,and the precipitation conditions of the inclusions were calculated by using the Factsage thermodynamic calculation software.The results showed that the deposition in the upper inner wall of the nozzle was mainly Al2O3 inclusions and frozen steel,which were obvious stratified into different layers.And the blocking at the bottom of the nozzle was caused by the deposition from the upper inner wall and the accumulation of frozen steel.Thus,a model of"clogging-scouring-accumulating-blocking"was established to describe the process at the bottom of the nozzle.

关 键 词：浸入式水口 结瘤 夹杂物 分层 热力学计算 

分 类 号：TF775[冶金工程—钢铁冶金]