MELTING BEHA VIOR OF IRON CARBIDES INJECTED INTO MOLTEN STEEL

碳化铁有望作为替代废铁的新铁源用于炼钢，特别是电弧炉炼钢。本研究的目的是研究碳化铁在钢水中的熔化行为，以明确其在不久的将来用于炼钢的可行性。1996和1997两个财政年度的结果如下：(1)根据新的工艺概念，用铁矿和我们指定的气体在沸腾床中反应，生产出高品位碳化铁(Fe_3C，6.7%，直径0.1-1 nm).(2)在50 kg感应炉中，用Ar气体将碳化铁吹到钢液表面，进行熔炼试验。通过测量熔体和出口气体中的温度和物种含量的变化来评估质量平衡和热平衡。(3)碳化物在熔体中的溶解没有任何问题。碳化度越高，熔化热越低。此外，熔体中氮的去除也得到了预期的确认。

Iron carbide is expected to be utilized as a new iron source alternative to iron scrap for steelmaking, especially using an electric arc furnace. Objectives of this research are to examine a melting behavior of iron carbide injected into molten steel in order to make clear a feasibility for it to be available for steelmaking in the near future. The following results were derived in the fiscal years 1996 and 1997.(1)High grade iron carbides (Fe_3C, 6.7mass%, diameter : 0.1-1 nun) were produced by reacting iron ores with our specified gas in a fluidized bed based on a new process concept.(2)Their melting tests were performed by blowing the iron carbide with Ar gas to the surface of molten steel through a lance in a 50kg induction furnace. Mass and heat balances were evaluated by measuring the variation of temperature and contents of species in melt and exit gas.(3)The carbides were proved to be dissolved into melt without any problems. Their melting heats tended to decrease with higher carbidization. Also, nitrogen removal in melt was confirmed as expected.