METHOD FOR REFINING STEEL

摘要

PURPOSE:To prolong the life of the refractories of a main refining furnace by blowing finely powdered desulfurizing agent into molten steel in a preliminary refining furnace to carry out prescribed preliminary desulfurization before the molten steel is decarburized and desulfurized in the main refining furnace. CONSTITUTION:Steel melted in a melting furnace is poured into a refining vessel, where the molten steel is chiefly decarburized and desulfurized. Prior to this refining in the main refining furnace, a finely powdered desulfurizing agent is blown into the molten steel in a preliminary refining furnace together with a flow of an inert carrier gas to carry out preliminary desulfurization until the S content in the molten steel is reduced to <=0.01%.