初期凝固シェルへの介在物捕捉に及ぼす溶鋼中［S］の影響
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概要
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In order to clarify the effect of compositions on the surface quality of ultra low carbon steel slabs, a model experiment investigating the effect of compositions on entrapment of inclusions was performed using molten steel with various concentrations of S, which is a surface active element between molten steel and inclusions, while varying the velocity of the molten steel flow at the solidification interface to obtain clear changes in the interfacial tension between the inclusions and the molten steel.As a result, entrapment of inclusions was enhanced with increasing S concentration, and the effect of S concentration on entrapment of inclusions depended on the velocity of the molten steel flow at the solidification interface.In the case of a large inclusion, the effect of S concentration on entrapment of inclusions is considered to be affected by the various thicknesses of the concentration boundary layer.