Reoxidation behavior of molten stool in tundish

It is necessary to clarify the reoxidation factors and quantitatively deter mine the contribution of each factor to the reoxidation of the molten steel to prevent the contamination in the tundish. In this study, the molten ste el in tundish has been sampled in production scale experiment and from the composition change of the molten steel the amount of reoxidation of the mol ten steel teemed from the first ladle into an actual tundish has been quant ified by factor as divided into initial teeming stage and stable casting st age. By applying the reaction rate model of oxidation by air which was deve loped on the basis of the basic experiment, the amount of oxidation by air in the tundish has been predicted successfully. Comparison of the amounts o f oxidation by air calculated from the change in the (N) under bar content with the experimentally determined amounts of oxidation has shown that it i s difficult to judge whether or not the molten steel is oxidized from the ( N) under bar absorption behavior alone.