FUNDAMENTAL-STUDY ON EFFECT OF STIRRING O N OXIDATION RATE OF MOLTEN STEEL IN TUNDISH

As basic research to quantify the oxidation rate of molten steel in tu ndish, oxidation experiments were performed on nonkilled molten steel and aluminum-killed molten steel, and the effect of stirring on the ox idation rate was studied. The oxidation rate of the nonkilled molten s teel by air is not affected by stirring and is controlled by diffusion of oxygen gas in the gas phase. Stirring changes the effect of the ox ide film in the oxidation process of the aluminum-killed molten steel by air. The oxidation rate of the aluminum-killed molten steel in the still state is controlled by the diffusion of solute oxygen in the oxi de film, while the oxidation rate of the aluminum-killed molten steel in the stirred state is controlled by the diffusion of oxygen gas in t he gas phase.