| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for shortening uniform mixing time by effectively stirring the whole molten metal in a ladle more than the conventional method, in the case of stirring the whole molten metal with gas for stirring by dipping an immersion tube for charging an adjusting material for adjusting a component in the molten metal under atmospheric pressure. SOLUTION: In a ladle refining by dipping the immersion tube for charging the adjusting material for adjusting the component into the molten metal and blowing and stirring the gas into the molten metal from the lower part, the diameter (d) of the immersion tube satisfies an inequality I and the position of a gas blowing nozzle for stirring is made to the center part of the immersion tube, and further, an eccentric quantity X of the center in the diameter direction of the immersion tube to the center in the diameter direction of the ladle satisfies an inequality II. The inequality I: 1.2.2h.tan(θ/2)<=d<=2.0.2h.tan(θ/2). The inequality II: d/2<=X<=D/2-h.tan(θ/2), wherein, h: blowing depth of the gas for stirring from the lower end of the immersion tube,θ: widening angle of rising gas bubbles and D: diameter of the ladle.
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