发明名称 |
Method and apparatus for controlled melt refining. |
摘要 |
<p>A controlled melt refining method is provided that ensures rapid and consistent refining by controlling the gas holdup (3H H), as an index for the intensity of boiling, at a predetermined value in the range of 0.1-0.5. The method comprises (a) covering the surface of a semi-killed molten steel in a ladle with a basic slag which either is non-oxidizing or contains not more than 5% of FeO; (b) maintaining the pressure of the atmosphere above the melt in the range of 30-150 Torr; (c) blowing an inert gas into the ladle from the bottom; and (d) maintaining the height of the boiling melt in terms of gas holdup (ΔH'H) within the range of 0.1-0.5 by controlling the pressure at which the inert gas is blown and or by adjusting a vacuum exhaust valve, ΔH being the difference in height between the surface of the boiling melt and a quiet melt, and H being the height of the quite melt. The present invention also comprises an apparatus for refining molten steel in accordance with the above method.</p> |
申请公布号 |
EP0178480(A2) |
申请公布日期 |
1986.04.23 |
申请号 |
EP19850111820 |
申请日期 |
1985.09.18 |
申请人 |
SUMITOMO ELECTRIC INDUSTRIES LIMITED |
发明人 |
YAMADA, KATSUHIKO C/O ITAMI WORKS OF |
分类号 |
C21C7/00;C21C7/072;C21C7/10 |
主分类号 |
C21C7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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