FeO-containing slag originated from the basic oxygen furnace to the ladle is a major reoxidation source during the following secondary refining.Ladle slag reduction treatment(slag treatment)is one of the common counte...FeO-containing slag originated from the basic oxygen furnace to the ladle is a major reoxidation source during the following secondary refining.Ladle slag reduction treatment(slag treatment)is one of the common countermeasures adopted to eliminate the steel contamination by FeO reoxidation.The oxygen transfer phenomenon between molten steel and slag was studied during the industrial production of interstitial-free(IF)steel,the measured and calculated oxygen activities in steel were compared,and the Fe–O equilibrium at the slag–molten steel interface was investigated by thermodynamic analysis.With slag treatment,the oxygen potential is higher in the molten steel than in the pre-deoxidation slag;this causes oxygen transfer from the molten steel to the slag,decreasing the efficiency of slag treatment.Based on this,a two-step slag deoxidation process was optimized.The second step further reduced the FeO content.On the other hand,the CaO/Al2O3(C/A)ratio in the refining slag must be controlled,because it affects the FeO activity and inclusion absorption capacity of the slag.The results suggest that the C/A ratio of 1.2–1.5 and the FeO content of\6%are beneficial to refine IF steel.展开更多
通过几何相似比1:4的水模型,研究了钢厂210 t RH精炼的处理时间、驱动气体流量、真空度、气孔数和浸入深度对夹杂物去除的影响以及底吹方式和气体流量对卷渣量的影响。模拟试验结果表明,处理24 min可去除约90%夹杂物,真空室下降时双透...通过几何相似比1:4的水模型,研究了钢厂210 t RH精炼的处理时间、驱动气体流量、真空度、气孔数和浸入深度对夹杂物去除的影响以及底吹方式和气体流量对卷渣量的影响。模拟试验结果表明,处理24 min可去除约90%夹杂物,真空室下降时双透气砖短时间底吹氩气可明显减少钢液卷渣量。得出210 t RH精炼合适的工艺参数为驱动气体流量164.2m^3/h,气孔数8个,浸入深度500mm,真空室绝对压力4000 Pa;双透气砖吹氩总流量为90m^3/h。展开更多
基金The authors are grateful for financial support from the National Natural Science Foundation of China under Grant No.51404020the National Key R&D Program of China under Grant Nos.2017YFB0304000 and 2017YFB0304001.
文摘FeO-containing slag originated from the basic oxygen furnace to the ladle is a major reoxidation source during the following secondary refining.Ladle slag reduction treatment(slag treatment)is one of the common countermeasures adopted to eliminate the steel contamination by FeO reoxidation.The oxygen transfer phenomenon between molten steel and slag was studied during the industrial production of interstitial-free(IF)steel,the measured and calculated oxygen activities in steel were compared,and the Fe–O equilibrium at the slag–molten steel interface was investigated by thermodynamic analysis.With slag treatment,the oxygen potential is higher in the molten steel than in the pre-deoxidation slag;this causes oxygen transfer from the molten steel to the slag,decreasing the efficiency of slag treatment.Based on this,a two-step slag deoxidation process was optimized.The second step further reduced the FeO content.On the other hand,the CaO/Al2O3(C/A)ratio in the refining slag must be controlled,because it affects the FeO activity and inclusion absorption capacity of the slag.The results suggest that the C/A ratio of 1.2–1.5 and the FeO content of\6%are beneficial to refine IF steel.
文摘通过几何相似比1:4的水模型,研究了钢厂210 t RH精炼的处理时间、驱动气体流量、真空度、气孔数和浸入深度对夹杂物去除的影响以及底吹方式和气体流量对卷渣量的影响。模拟试验结果表明,处理24 min可去除约90%夹杂物,真空室下降时双透气砖短时间底吹氩气可明显减少钢液卷渣量。得出210 t RH精炼合适的工艺参数为驱动气体流量164.2m^3/h,气孔数8个,浸入深度500mm,真空室绝对压力4000 Pa;双透气砖吹氩总流量为90m^3/h。
