| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for restraining the oxidation of [Mn] in molten steel without bringing about the damage of a refractory at the bottom part of a vacuum vessel. SOLUTION: When the oxygen-containing gas is top-blown from a lance in the vacuum vessel in an RH vacuum degassing apparatus, the ratio (H/Ho) of the height H of the lance to the bath depth Ho of the molten steel in the vacuum vessel is regulated to 3-30.
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