THE DENITRIDING METHOD OF MOLTEN METAL

摘要

PURPOSE: A method for removing nitrogen from molten steel by controlling the agitation force of molten steel in a ladle and a molten steel component is provided, which can effectively remove nitrogen with low investment cost and operation cost. CONSTITUTION: In a method for removing nitrogen in molten steel(3) by positioning a ladle(2) containing molten steel in a vacuum tank(1), the method comprises the steps of: introducing quicklime and Al supply source into a ladle; desulfurizing to be a sulfur content in molten steel of 0.01% or less by blowing agitating gas into molten steel from the lower part of a ladle and strongly bubbling for 5 to 10 min; and removing nitrogen of molten steel by blowing agitating gas into molten steel from the lower part of a ladle. The ladle is allowed to be placed in the vacuum tank after introducing the quicklime and Al supply source into the ladle.