论文部分内容阅读
为了减少RH吹氧升温对洁净度的影响,汽车用钢在转炉冶炼过程中终点温度往往更高,从而导致转炉冶炼过程脱磷困难。通过对渣钢间脱磷热力学和动力学的计算,分析了转炉“留渣+双渣”工艺条件下磷分配比与钢液成分、炉渣成分以及温度的关系;结合工业生产试验,通过改变倒渣时间以及调整炉渣成分并对转炉冶炼过程钢液、炉渣连续取样,研究了转炉“留渣+双渣”工艺条件下的脱磷变化规律并得出了快速脱磷的工艺条件:吹炼开始加入小块废钢和轻薄料快速增加炉渣FeO含量并控制钢液温度的升高,吹氧量达到40%时倒出高磷含量炉渣;吹氧量为40%~80%期间增加炉渣FeO含量,减少炉渣返干,防止钢液回磷;转炉终渣碱度控制在4.0左右,终渣TFe质量分数在18%~20%和尽量低的出钢温度。
In order to reduce the influence of RH blowing oxygen temperature on cleanliness, the finish temperature of automobile steel in BOF smelting process tends to be higher, resulting in difficulties in dephosphorization during BOF smelting. Through the calculation of thermodynamics and kinetics of dephosphorization among slag steel, the relationship between phosphorus distribution ratio and composition of molten steel, slag composition and temperature under the condition of converter “residue + double slag ” was analyzed. Combined with industrial production test, Changing the slag pouring time and adjusting the composition of the slag, and continuously sampling the molten steel and slag in the converter smelting process, the dephosphorization variation under the condition of converter “residue + double slag ” was studied and the process conditions of rapid dephosphorization : Blowing began to join the small pieces of scrap and thin material quickly increase the slag FeO content and control the temperature of the molten steel, blowing oxygen content of 40% poured out of high phosphorus content of slag; oxygen blowing 40% to 80% during the increase Slag FeO content, reducing slag back to dry, to prevent the molten steel back to phosphorus; converter slag final control of about 4.0 in the final slag TFe mass fraction of 18% to 20% and as low tapping temperature.