SIMPLE LADLE REFINING METHOD

摘要

A simple ladle refining method capable of increasing temperature in a short time with scattering and deposition of splash and refractory melting loss restricted. A method of refining molten steel in a ladle, comprising blowing an inactive gas into the ladle through the bottom of the ladle, inserting an immersion pipe into the ladle while agitating the molten steel and blowing an oxidizing gas onto the surface of the molten steel in the immersion pipe via a lance, wherein a ratio (do/dt) of a nozzle exit diameter (do)(mm) to a nozzle throat diameter (dt)(mm) is set to 1.2.alpha. to 2.5.alpha., where .alpha. i s defined as a function of a back pressure.