Submerged entry nozzle(SEN)is a guiding device for molten steel flow in slab continuous casting mold.Optimizing the structure of the SEN and improving the flow behavior of molten steel are of great significance for the production of high-quality slabs.In this paper,the widely used SEN structure in slab continuous casting are summarized firstly.Then,the domestic and foreign research on the influence of SEN structure on the flow behavior of molten steel is reviewed.The influence of structural parameters such as inner hole,side hole,and bottom hole/bottom and immersion depth of SEN on molten steel flow velocity,liquid level fluctuation and flow pattern are clarified.Several innovative SEN structures with new technological requirements and their application limitations are discussed.Finally,it is pointed out that,on the one hand,the optimization of the SEN structure should be further developed with the determination of the optimal steel flow field of slab continuous casting mold,on the other hand,considering the actual situation of clogging,relevant research should be carried out on the dynamic change of SEN structure,so as to accurately control the flow of molten steel and significantly promote the quality improvement of continuous casting slabs.
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