通过对国内某厂300t转炉终点相关数据的理论分析,发现影响转炉终点水平的有：转炉炉龄、转炉终点温度以及吹氧量等。转炉吹炼过程中存在一个临界碳含量。当转炉终点碳含量低于临界碳含量时,脱碳变得困难,钢水过氧化严重。采用规则溶液模型计算转炉渣中FeO的活度,据此计算的临界碳含量（质量分数）为0.02%～0.03%。根据理论分析和实际统计结果,300t转炉理想的终点碳质量分数为0.03%～0.05%。
By analyzing the end-point data of a 300 t-BOF in a domestic steelmaking company, it is founded that the factors of converter life, end-point temperature, oxygen consumption and so on have impacts on BOF end-point. A critical carbon content exists in the BOF blowing process. Below the critical carbon content, the decarburizing reac- tion gets harder and molten steel is greatly peroxided. The critical carbon content of 0. 02%-0. 03%is calculated corresponding to the ferrous oxide activity with regular solution model. The optimum end-point carbon content of 300 t BOF is 0.03 %-0.05% through the theory analysis and practice statistics.
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