Abstract
It is necessary to clarify the reoxidation factors and quantitatively determine the contribution of each factor to the reoxidation of the molten steel to prevent the contamination in the tundish. In this study, the molten steel in tundish has been sampled in production scale experiment and from the composition change of the molten steel the amount of reoxidation of the molten steel teemed from the first ladle into an actual tundish has been quantified by factor as divided into initial teeming stage and stable casting stage. By applying the reaction rate model of oxidation by air which was developed on the basis of the basic experiment, the amount of oxidation by air in the tundish has been predicted successfully. Comparison of the amounts of oxidation by air calculated from the change in the N content with the experimentally determined amounts of oxidation has shown that it is difficult to judge whether or not the molten steel is oxidized from the N absorption behavior alone.
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