Abstract: In view of the service failure and low continuous casting production efficiency due to the corrosion of refractories at slag-line in the submerged entry nozzles,a submerged entry nozzle for the low-carbon aluminum killed steel continuous casting in one steel plant was sampled and taken as the research object to analyze the causes and the mechanism of refractory corrosion at the slag-line.The results show that the core issue of the corrosion and necking of the slag-line materials is that the slag-line material are eroded,dissolved,and reacted by the mold flux gradually.Therefore,it is important to suppress or avoid the contact and reaction between the mold flux and slag-line materials.

Key words: continuous casting, submerged entry nozzle, slag-line, zirconia-carbon, slag corrosion resistance

摘要： 针对目前连铸浸入式水口渣线部位耐火材料的侵蚀造成水口服役失效与连铸生产效率无法提升的难题,以某钢厂低碳铝镇静钢连铸常用的ZrO₂-C质浸入式水口为例,对其侵蚀后的水口渣线部位耐火材料进行取样,详细分析了水口渣线部位耐火材料的侵蚀原因与机制。结果表明:保护渣对水口外部渣线材料的冲刷、溶解与反应是导致浸入式水口渣线部位侵蚀和缩颈的核心问题。因此,如何有效防止或避免渣线部位耐火材料与保护渣间的接触与反应对抑制渣线侵蚀至关重要。

关键词: 连铸, 浸入式水口, 渣线, ZrO₂-C, 抗渣侵蚀