120t转炉滑板挡渣冶金效果分析

针对马钢120t转炉自2013年使用滑板挡渣技术后,转炉出钢过程中渣量明显减少,相比于挡渣棒方式挡渣,钢包渣层厚度由平均117下降到64 mm,经过LF炉精炼钢种SPHC平均每炉铝粒消耗量由127减少到108kg,下渣回磷率小于0.005%比例由78%提高到92%,对不经过LF炉精炼板坯Q235B钢种硅、锰收得率分别提高了3.6%及1.2%,经过RH炉精炼的硅钢减少预熔型顶渣改质剂加入量12%左右等效果。

Analysis of metallurgical effect of slide gate slag-stopping in 120 t converter

After the slide gate slag-stopping technology has been applied in the 120 t converter in Masteel since 2013, the amount of the slag carryover during tapping is reduced significantly. Compared with the slag dart, the thickness of the slag layer in the ladle decreased from 117 to 64 mm. In terms of the steel grade of SPHC refined by LF, the average consumption of aluminum in each heat reduced from 127 to 108 kg, the percentage of phosphorus pick-up (＜0.005%) increased from 78% to 92%. As for Q235B, which was without the secondary refining, the yield of silicon and manganese increases by 3.6% and 1.2%, respectively. For the silicon steel refined by RH, the amount of premelting top-slag modification agent reduced by about 12%.