| 摘要 |
<p>PURPOSE: To effectively execute desulfurization in short time with lowering oxygen concentration in molten steel by adding a deoxidizer and a desulfurizing agent to molten steel when tapping the molten steel blown in a converter. CONSTITUTION: When tapping a molten steel 3 blown in a converter 1 to a ladle 4, a deoxidizer and a desulfurizing agent, as required a slag modifier, are simultaneously added to the molten steel 3 in its tapping. Metal Ca, Ca-Si alloy, metal Al, etc., are used as deoxidizers, CaO-CaF2 , etc., as desulfurizing agents, Al-CaCO3 as slag modifier. By this method, the added agents are suspended in the molten steel 3 by agitating effect of a tapping steel flow 2 and the reaction with molten steel 3 is promoted, the oxygen concentration is lowered to <=20ppm and the sulfur concentration to about <=10ppm.</p> |
