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日本钢管公司福山钢铁厂为了解决复合吹炼转炉在吹炼末期所产生的钢水增氮问题,而对该厂300t的复合吹炼转炉在其吹炼过程中的氮的行为进行了分析研究。由分析研究得知,转炉吹炼终点钢中含氮量受铁水成分,铁水配比、终点含碳量及终点炉渣量的影响。在复合吹炼转炉中,钢水的含氮量波动在20～60ppm间。在钢水到达〔C_T〕点(C_T点为钢水含碳量的转变点,此时钢水含碳约为0.3％)之前,能够顺利地进行脱氮,可将钢中〔N〕降至15ppm。而当超过C_T点后,则钢水一方面进行脱氮,另一方面又将发生钢水吸氮现象,从而将造成钢水的增氮。因此,为了将钢中含氮
Japanese steel company Fukuyama Iron and Steel Co., Ltd. In order to solve the compound blowing converter in the refining of steel produced by the late nitrogen blowing problem, and the plant 300t composite blowing converter in the blowing process of nitrogen behavior were analyzed. According to the analysis and study, the nitrogen content in the steel at the end of converter blowing is affected by the composition of hot metal, the ratio of molten iron, the end point carbon content and the end point slag amount. In the composite blowing converter, the nitrogen content of molten steel fluctuates between 20 ~ 60ppm. Nitrogen can be smoothly removed before the molten steel reaches [C_T] point (C_T point is the transition point of the molten steel carbon content, when the molten steel carbon content is about 0.3%), and the [N] in the steel can be reduced to 15 ppm. When the C_T point is exceeded, the molten steel is denitrified on the one hand and the nitrogen absorption of molten steel on the other hand, which will result in the increase of nitrogen in the molten steel. Therefore, to contain nitrogen in the steel