SMELTING METHOD FOR DEAD SOFT STEEL HAVING HIGH CLEANNESS

摘要

PURPOSE:To prevent the splash of molten and the shortening of the service life of the refractories of a vacuum degassing vessel by dispersing fine bubbles of an inert gas as nuclei for generating bubbles in the molten steel in a ladle or the like, feeding the molten steel into the degassing vessel and accelerating the decarburization reaction of the molten steel. CONSTITUTION:An inert gas 7 for generating fine bubbles 8 is blown into molten steel 2 in a ladle 4 through porous plugs 6 fixed in the bottom of the ladle 4 or the like. The molten steel 2 contg. generated fine bubbles 8 is circulated in a vacuum degassing vessel 14 under reduced pressure. The decarburization reaction of the molten steel is accelerated and dead soft steel having high cleanness is obtd.