Abstract: Based on theoretical analysis on dephosphorization in steelmaking process, the off-gas analysis is used to control steel melting process and end-point temperature of molten steel, control slag melting process, forecast end-point phosphorus content in steel and get low phosphorus molten steel. For 100 t top and bottom combined blown converter at Shouqin Metal Materials Co Ltd, the silicon content in hot metal is 0. 2% ~ 0. 8% and the phosphorus content is 0. 052% ~ 0. 090% , the pipeline steel production results show that by off-gas analysis the percentage of hits for end-point temperature of molten steel (1 580 ~ 1 650 ℃)is more than 95% , and the forecasting by model and the measuring BOF end-point phosphorus content are respectively 0.007 6% and 0.007 4%. The aim of BOF end-point phosphorus content ≤ 0. 010% is realized by off-gas analysis.

摘要： 基于对脱磷工艺的理论分析,通过100 t转炉烟气分析控制熔炼过程、终点温度、过程化渣控制和预测终点磷含量以获得低磷钢水。首秦金属材料公司100 t顶底复吹转炉所用铁水的硅含量为0.2%～0.8%,磷含量0.052%～0.090%,管线钢的生产结果表明,烟气分析终点温度(1 580～1 650℃)命中率能达到95%以上;模型预测磷含量与转炉终点实际磷含量分别为0.007 6%和0.0074%,通过烟气分析实现了转炉终点磷含量≤0.010%的目标。

关键词: 100t转炉, 炼钢, 烟气分析, 终点控制, 低磷钢