| 摘要 |
PROBLEM TO BE SOLVED: To provide a bottom-blown tuyere of which the spalling resistance is improved by a simple means. SOLUTION: The bottom-blown tuyere is disposed at the bottom part of a refining vessel for holding and refining molten metal and is used for blowing refining gas into the refining vessel, the bottom-blown tuyere has a cylindrical outer tube and a cylindrical center tube and is arranged so that the center axis of the outer tube is aligned with the center axis of the center tube, wherein a t value, a D<SB>1</SB>value and a D<SB>2</SB>value calculated by t=(D<SB>1</SB>-D<SB>2</SB>)/2 from the inner diameter D<SB>1</SB>(mm) of the outer tube and the inner diameter D<SB>2</SB>(mm) of the center tube, satisfy D<SB>1</SB>≥40 mm and 0<t/D<SB>1</SB>≤0.025. COPYRIGHT: (C)2007,JPO&INPIT
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