| 摘要 |
PURPOSE:To produce an iron alloy contg. boron and little impurities at a low cost by adding boron oxide and a specified amount of calcium to molten iron or a molten iron alloy, reducing the boron oxide and treating the molten metal under reduced pressure. CONSTITUTION:Boron oxide and calcium by an amount 0.95-1.5 times times the amount required to reduce all of the boron oxide are added to molten iron or a molten iron alloy, the boron oxide is reduced and the remaining calcium is evaporated at >=1,422K temp. under 10<-5>-10<-1>Torr reduced pressure. The amount of calcium required to reduce boron oxide is about 3mol per 1mol B2O3.
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