| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a high Mn content metal containing≥10 mass% Mn by decarburizing and denitrogenizing the high Mn-containing molten metal composed by mass% of≥10% Mn,≥0.1% C,≥0.001% N and the balance Fe with impurities. SOLUTION: In the case of using a reduced pressure refining facility, in which a ladle holding the molten metal is accomodated into a vessel and the pressure is reduced together with the vessel, and the molten metal is refined in the ladle, and in the case of using a circulating type degassing facility having a vacuum vessel and an immersion tube, in the ladle a refractory containing≥20 mass% MgO is used and oxygen gas is supplied under condition of 6,000-16,000 Pa atmospheric pressure in the vacuum vessel and 1,500-1,650°C temperature of high Mn content molten metal to apply the decarburization and the denitrogenization. The high Mn-contained molten metal can further contain by mass% of one or more elements selected in the group composed of≤1% Si,≤0.5% P,≤0.5% S,≤20% Cr,≤1% Cu, and≤10% Ni in stead of a part of Mn and Fe. COPYRIGHT: (C)2011,JPO&INPIT
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