Refining apparatus of molten steel for producing ultra low carbon steel and method for refining molten steel using the same

摘要

The present invention relates to a method of refining molten steel in an extruded refining process of a steel making process and a method of refining molten steel using the same to produce an ultra low carbon steel, which can easily remove carbon components in the molten steel and effectively prevent the temperature drop of the molten steel The purpose of this invention is to provide a refining apparatus for molten steel which can perform stable operation and to provide a refining method of molten steel using the refining apparatus. In the RH vacuum degassing apparatus which includes a dipping tube comprising a vacuum vessel, an upflow recirculation tube and a down recirculation tube, and the molten steel is melted, a plurality of gas injection lance nozzles comprising an inner pipe and an outer tube are injected toward the molten steel in a vacuum vessel An ultra low carbon steel which is formed on the side wall of the vacuum vessel of the RH vacuum degassing device, and has a neck formed so as to form a supersonic jet stream, and the outer tube is formed so that cooling gas for cooling the inner tube is injected The refining apparatus of the molten steel and the refining method of the molten steel using the same.