| 摘要 |
PURPOSE:To form the titled ferroboron without the buldging of a hearth by changing an iron-contg. raw material into an electric furnace and melting, and then charging a boron-contg. raw material and a carbonaceous reducing agent and melt-reducing. CONSTITUTION:An iorn-contg. raw material (mild steel scrap, shavings, etc.) is charged into an electric furnace, after finishing the tapping, and melted. A boron-contg. raw material (boric anhydride, borax, etc.) and a carbonaceous reducing agent (coke, coal, etc.) are blended, mixed, and charged into the melt bath. The boron is reduced, and the formed boron is alloyed with iron to form a ferroboron bath contg. at least about 20% boron. The melt is extracted from the electric furnace. Consequently, even when B4C is deposited on the hearth, a part of the deposit is decomposed by controlling the mixing proportion of molten iron or iron oxide and the carbonaceous material necessary for reducing the iron and the iron oxide. Since the formed boron is absorbed by the molten iron, the buldging of the hearth is prevented.
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