Zhang Lianyou,Liu Qin,Xiao Jia,et al.Multiphase Flow Simulation of the Slag Entrapment Behavior of Steel Ingots Influenced by the Inlet Angle of the Nozzle[J].Special Steel,2026,47(02):80-88.
Zhang Lianyou,Liu Qin,Xiao Jia,et al.Multiphase Flow Simulation of the Slag Entrapment Behavior of Steel Ingots Influenced by the Inlet Angle of the Nozzle[J].Special Steel,2026,47(02):80-88.DOI: 10.20057/j.1003-8620.2025-00141.
Multiphase Flow Simulation of the Slag Entrapment Behavior of Steel Ingots Influenced by the Inlet Angle of the Nozzle
As a typical defect formed during the ingot filling process, the slag entrapment directly affects the final quality of the steel ingot. The shape of the nozzle at the bottom of the ingot mold is a key factor influencing the flow of molten steel and the behavior of slag entrapment,in order to explore the influence law of the shape of the nozzle on the slag entrapment behavior, this paper, based on the Fluent multiphase flow model, systematically studies the influence of the inlet angles of the nozzle (5°, 15°, 25°) on the behaviors such as the flow field and slag droplet capture during the filling process of a 3.1 t steel ingot by taking into account the interactions among the three phases of molten steel, mold powder, and air as well as the solidification behavior during the filling process of molten steel. The results show that: in the initial stage of the filling process, the solidified shell in the tail region of the steel ingot is relatively thin, and the internal fluidity inside the molten steel is good, so the slag droplets will quickly float up to the slag layer. With the increase of the filling height, the change of the inlet angle of the nozzle will significantly affect the flow pattern of the molten steel. The larger the inlet angle is, the more the main stream of the molten steel will deviate towards the outer sidewall. For this type of ingot, when the inlet angle of the nozzle is 5°, the internal eddy current inside the molten steel is always located in the area near the liquid surface where the solidified ingot shell has not been formed. The flow pattern and the solidification process are more conducive to suppressing the occurrence of slag entrapment.This study can offer references and guidance for the design of nozzle shapes in bottom-pouring mold casting production.
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