复吹转炉冶炼低磷钢试验研究

研究了复吹转炉铁水脱磷预处理,半钢倒渣后在同一转炉内进行少渣精炼冶炼超低磷钢的工艺。结果表明:在铁水磷含量0.13%条件下,半钢和终点渣碱度(CaO/SiO2)控制在2.0和3.6左右,TFe含量控制在18%左右,半钢倒渣量40%～60%,半钢脱磷率最高达65%,平均为50%,终点脱磷率最高98%,平均为94.6%,冶炼终点钢水磷含量控制在0.007%以下,最低0.003%,满足低磷钢生产要求。

Experimental Studies on Low Phosphorus Steel Produced from Top and Bottom Combined Blown Converter

This paper studies the low phosphorus steel smelting process in the top and bottom combined blown converter.After dephosphorization pretreatment of hot metal and then deslagging in semisteel procedure,the same converter was used to smelt ultralow phosphorus steel with the remaining part of slag.The results show that with phosphorus content of 0.13% in the hot metal,basicities of semisteel and the final slag is controlled at around 2.0 and 3.6 respectively,total iron at 18% or so,deslagging volume of semisteel at 40% to 60%,the dephosphorization rate of semisteel peaks at 65% with an average of 50%,and dephosphorization rate of the final steel peaks at 98% with an average of 94.6%;phosphorus content in the final steel can be controlled under 0.007% with the minimum of 0.003%,satisfying the requirements of low phosphorus steel.