PROCESS FOR VACUUM REFINING OF MOLTEN STEEL AND APPARATUS THEREFOR

摘要

A process for vacuum refining of molten steel by using a refining flux, wherein a fuel gas and an oxygen gas are spouted to the outlet of a top-blown lance of a vacuum refining apparatus to create a burner flame below the top-blown lance, and, in addition, the refining flux is fed into the top-blown lance using an oxygen gas as a carrier gas and further passed through the burner flame, and the heat melted refining flux is allowed to arrive at the surface of the molten steel. In this case, the refining flux feed rate and the circulating flow rate of the molten steel during vacuum refining are regulated so as to have a predetermined relationship, achieving a low unit requirement for the flux throughout one campaign of the vacuum tank. <IMAGE>