Abstract: Reducing the emulsification degree of the slag-steel interface in the continuous casting mold is very important to reduce the slag entrainment and improve the quality of the slab. In order to reveal the formation mechanism of the emulsification behavior and the fluid structure of emulsification, the emulsification behavior of the slag-steel interface in the argon blowing continuous casting mold was studied by water model experiments, the effects of mold section size, casting speed, argon flow rate and nozzle immerge depth on the emulsification behavior of the slag layer were analyzed. The results show that the retention of argon bubbles and droplets in the slag phase and the violent fluctuation of the slag-steel interface can promote the emulsification behavior. After the emulsification is complete, there will be three flow structures of smooth stratified flow, flocculated stratified flow and flocculated wave emulsification flow. By analyzing the thickness of the slag layer and the fluctuation of the liquid level, it is found that reducing the cross-sectional size of the mold, increasing the casting speed, increasing the argon flow rate and reducing the depth of the nozzle will aggravate the emulsification of the slag-steel interface. 

Key words: continuous casting mold, slag-steel interface, emulsification, flow structure, water model experiment