MgO-C质塞棒侵蚀机理及改进措施  

Erosion mechanism and improvement of MgO-C stopper nose

作　　者：侴宏晔 李支峰 金从进 王东 杨政宏 屈天鹏 CHOU Hongye;LI Zhifeng;JIN Congjin;WANG Dong;YANG Zhenghong;QU Tianpeng(Citicsteel-Chianaref New Materials Research Institute,Chianaref Co.,Wuxi 214200,China;Shagang School of Iron and Steel,Soochow University,Suzhou 215137,China)

机构地区：[1]江苏嘉耐股份高温材料有限公司中特嘉耐新材料研究院,江苏无锡214200 [2]苏州大学沙钢钢铁学院,江苏苏州215137

出　　处：《炼钢》2023年第1期68-74,共7页Steelmaking

摘　　要：针对某钢厂连铸MgO-C质塞棒棒头侵蚀特征,结合XRF、XRD和电镜能谱等检测分析手段,研究了棒头侵蚀机理。结果表明,在连铸中间包控流点附近形成高真空区域,MgO被还原导致晶粒分解和碎化,向钢水供镁,并形成低强度多气孔结构反应层容易被钢水渗透和冲蚀。MgO晶间基质硅含量过高,易形成结晶相与缩孔微裂纹,恶化晶间强度,易导致MgO颗粒从棒头剥落进入钢液。上述结果造成塞棒控流失效,对连铸生产稳定与铸坯质量构成威胁,影响初始夹杂物成分恶化钢水洁净度;通过优化控流区流场、改善原材料等措施可降低塞棒侵蚀风险和相关负影响。In view of the erosion characteristics of MgO-C stopper nose used in a steel plant,the corrosion mechanism of stopper nose was studied by means of XRF,XRD and EDS.It is indicated that high vacuum is formed in the flow control point area of the continuous casting tundish,MgO is reduced to lead to the decomposition and fragmentation of the grains,supply magnesium to the molten steel,and form a low-strength porous structure reaction layer that is easily penetrated and eroded by the molten steel.If the content of silicon in the MgO intergranular matrix is too high,it is easy to form crystalline phase and shrinkage micro-cracks,deteriorate the intergranular strength,and easily lead to MgO particles peeling off from stopper nose and entering the molten steel.The above results result in the failure of stopper flow control,which threatens the stability of continuous casting production and the quality of casting slab,and affects the composition of initial inclusions and deteriorates the cleanliness of molten steel.By optimizing the flow field in the flow control area and improving raw materials,the risk of stopper erosion and related negative effects can be reduced.

关 键 词：MgO-C塞棒 侵蚀 控流区 高真空 钢水洁净度 

分 类 号：TF777[冶金工程—钢铁冶金]