IF钢加硅脱氧生产实践

PRACTICE FOR ADDING SILICON TO DEOXIDIZE OF IF STEEL

对IF钢加硅和加铝脱氧升温效果进行了理论计算和现场实验对比,热力学理论计算表明,100 kg的铝粒脱氧可使270 t钢水升温12.35℃,但在实际生产中升温平均值为10.29℃;同样加入等质量的硅,其理论升温量为11.1℃,实际升温平均值为8.81℃。IF钢增硅主要来自于脱氧后钢中的Als对渣中SiO_(2)的还原。通过实际生产发现,在转炉加入硅铁,成品增硅量最少,正常情况下控制硅铁的加入量不大于150 kg,基本能保证钢水硅不超内控标准,而且进站钢水氧含量与RH处理结束时钢水中的硅含量成反比关系。

In this paper,the effect of deoxidizing IF steel with silicon or aluminum on temperature rise has been calculated theoretically and compared with field experiments.The thermodynamic calculation shows that the temperature rise of 270 t molten steel is 12.35℃after deoxidation by 100 kg aluminum particles,however,the average temperature rise in actual production is 10.29℃.Similarly,the theoretical temperature rise of equal mass silicon is 11.1℃.The actual average temperature rise is 8.81℃.Silicon in IF steel is mainly obtained with reduction of SiO_(2)in slag by Als.It is found that the least amount of silicon increment is obtained by adding ferrosilicon in the converter.Under normal conditions,the amount of silicon in molten steel can be controlled to be less than 150 kg.In addition,the oxygen content of molten steel at the beginning of treatment is inversely proportional to the silicon content of molten steel at the end of RH treatment.