Alキルド鋼鋳込時の溶鋼再酸化挙動

概要

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The kinetics of reoxidation of Al killed steel with slag and air were investigated in laboratory experiments using tammann furnace and in plant experiments using commercial 85×10^3kg tundish. Experimental results were discussed by the coupled reaction model. Observed apparent rate constants of [sol.Al] decreased with increasing (CaO)/(SiO_2) ratio in laboratory experiments and showed a good agreement with calculated ones. Flow rate of air leak at steady state was evaluated to be 3.0×10^<-5> and 4.0×10^<-4>m^3/s inside and outside of immersion tube in commercial tundish, respectively and was estimated to have little influence on reoxidation. Mass transfer coefficient in metal was estimated to be 6.0×10^<-5>m/s based on the tundish mixing model and the coupled reaction model. Observed [sol.Al] in tundish decreased with increasing (%FeO)+(%MnO) value in ladle slag and showed a good agreement with calculated one by considering reoxidation in ladle and air leak at unsteady state.
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