| 摘要 |
PURPOSE:To prevent clogging of gas blowing holes by molten steel and to improve a service life of a lance by blowing gas into the molten steel at a speed more than a sound speed from the gas blowing holes of the bubbling lance. CONSTITUTION:The bubbling lance 1 is inserted into a suitable depth of the molten steel, to execute the stirring by supplying gas, such as Ar gas, into the molten steel at the flowing speed not less than the sound speed. The flowing speed of Ar gas is settled based on a predetermined condition by gas blowing position, gas temp. at the blowing holes and an inner diameter of the gas blowing pipe. By blowing the gas as jet flowing, the clogging of the gas blowing holes by the molten steel is prevented, and also the service life of the blowing lance is improved.
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