| 摘要 |
PURPOSE:To eliminate clogging of a bottom blowing nozzle, to obtain good working efficiency and to protect the bottom blowing nozzle by blowing inert gas from the bottom blowing nozzle after steel tapping, and cooling and solidifying molten steel around the bottom blowing nozzle tuyere. CONSTITUTION:Some quantity of the molten steel is remained in a converter 1 after steel tapping. The inert gas of Ar gas, etc., is blown in this converter 1 through a pipe 5 and the bottom blowing tuyere 4. By gas blowing force, the remained molten steel around the tuyere 4 is swelled and cooled by the gas to form solidified part 7. By this solidified part 7, the part around the tuyere 4 of the nozzle 5 is coated and in case next molten steel is charged as the solidified part 7 is the same quality as the molten steel, the solidified part 7 is scarcely melted. Therefore, the nozzle 5 is effectively protected from the molten steel and the erosion of the nozzle 5 is restrained.
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