METHOD FOR PRODUCING HIGH CLEANLINESS STEEL

摘要

PROBLEM TO BE SOLVED: To provide a secondary refining method by which a high cleanliness steel can be obtained while utilizing a vacuum stirring treating process such as an RH treatment. SOLUTION: When the secondary refining containing vacuum degassing treatment is applied to molten steel tapped into a ladle from a decarburize- refining furnace, a non-metallic inclusion floating up and separating process composed of only the molten steel stirring is additionally performed after completing the addition of an alloy agent.