Numerical simulation was carried out to clarify the effect of injected argon gas and the magnetic stirrer on the flow pattern and distribution of the molten steel temperature in a high-speed caster. Inclusion floatation and the shell thickness were also estimated based on the steel flow and temperature distribution. The flow pattern and steel temperature differ depending on the vertical position of the stirrer. A low steel velocity at the meniscus reduces mold flux entrainment, whereas a higher flow velocity in the lower part of the mold enhances the equiaxed grain structure. The argon gas flow rate influences the steel flow pattern and temperature distribution because the buoyancy of the gas bubbles affects the jet flow from the nozzle spout. The flow induced by the stirrer promotes homogeneity of the shell thickness and floatation of inclusions.
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