转炉冶炼纯铁钢种C、Mn元素的控制

通过对生产控制的分析及研究,发现铁水经过 AOD 炉脱锰可满足导电纯铁对低锰铁水的需要；在相同工艺条件下,转炉终点碳含量越低,RH 炉脱碳效果越好。理论分析发现：转炉较低的碳氧积水平有利于终点 C含量的降低；较低的转炉终点温度、避免补吹和良好底吹效果,可保持较低碳氧积水平。利用正规溶液模型计算了碳-铁的选择性氧化临界碳含量范围,并考虑连铸工艺可浇性,控制转炉终点 C 含量,降低中包铝损及二次氧化。分析结果显示,邢钢转炉生产纯铁钢种理想的终点碳质量分数应控制在0·036％~0·045％。

Control of C and Mn elements for conductive pure iron smelting by converter

The results of the process control indicate that low-manganese molten iron processed by AOD furnaces can meet the requirements of the conductivity of pure iron;in the same process conditions,the lower the endpoint carbon content,the better is the decarburization effect of RH furnaces.Theoretically analytical results reveal that low carbon-oxygen product is favorable to the reduction in endpoint carbon content,which can be realized at rela-tively low final temperature or by avoiding supplementary blowing and implementing good bottom blowing effect. Meanwhile,regular solution model was used to determine the critical carbon content range of the iron-carbon se-lective oxidation balance.By considering the reliability of continuous casting,the critical endpoint carbon content, and the loss reduction of aluminum alloy in the tundish and the reoxidation,it is reasonable to control the optimal critical endpoint carbon content in the range from 0·036% to 0·045% in Xingtai Iron and Steel Co.,Ltd.