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采用共存理论、动力学分析和实验验证的方法,研究转炉冶炼超低碳钢吹炼末期炉渣成分对终点[C]含量的影响规律,建立1853~1973 K时终点[C]与炉渣成分和温度的回归模型.结果表明:Fe O活度受温度影响较小,主要受炉渣成分的影响;脱碳动力学条件主要受炉渣成分和温度的影响.炉渣碱度增加,终点[C]含量升高;渣中Fe O含量增加,终点[C]含量迅速降低,渣中Fe O质量分数应控制在12.0%~18.0%之间;渣中Mg O质量分数在7.0%~13.0%范围内逐渐增加,钢液中[C]质量分数增加值不足0.01%;随着温度的增加,钢液中[C]含量降低.回归模型对冶炼超低碳钢的转炉终点[C]含量的预判平均误差率为±15.25%,[C]含量误差在±0.01%以内的炉次占69.19%.
The effects of slag composition on the content of [C] at the end of converter during the final stage of BOF smelting ultra low carbon steel were studied by means of coexistence theory, dynamic analysis and experimental verification. The relationship between the end point [C] of 1853 ~ 1973 K and the composition and temperature of slag The results show that the activity of FeO is less affected by the temperature and is mainly affected by the composition of the slag.The decarburization kinetics conditions are mainly affected by the composition and temperature of the slag.The basicity of slag increases and the content of [C] ; The content of FeO in the slag increased and the content of [C] decreased sharply, the mass fraction of FeO in the slag should be controlled between 12.0% ~ 18.0%; the mass fraction of MgO in slag increased gradually in the range of 7.0% ~ 13.0% The value of [C] mass fraction in molten steel is less than 0.01%. With the increase of temperature, the content of [C] in molten steel decreases.The regression model predicts the average error rate [C] ± 15.25%. The furnace with [C] content error within ± 0.01% accounted for 69.19%.