Review on the flow pattern of molten steel in the submerged entry nozzle and the mold of continuous casting slabs
Through a systematic analysis of the current researches on flow patterns in the nozzle and mold,this study explores the transformation laws,common characteristics,influencing factors,and their effects on slab quality under various operating conditions,with a particular focus on the asymmetry of flow in the mold.The conclusions are as follows:multiple flow patterns,including bubbly flow,film flow,annular flow,and slug flow,exist within the nozzle and are influenced by liquid flow rate,gas flow rate,and the level of liquid in the tundish.Bubbly flow is relatively stable and beneficial for continuous casting production.When the slab mold operates in a symmetric double-roll flow pattern and the mold surface flow velocity is controlled between 0.26 and 0.43 m/s,it significantly improves the quality of the cast slabs.Meanwhile,a higher casting speed,a lower argon flow rate,and an increased immersion depth of the nozzle have benefit for the formation of the double-roll flow pattern.Flow asymmetry can lead to bias flow.Thus,precise process control can ensure smooth production and enhance slab quality.
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