Process Practice of Desulfurization in Silicon Steel Produced by the KR-BOF-RH-CC

The desulfurization of silicon steel in the course of KR-BOF-RH-CC process were analyzed by industrial practice verification and statistics. The results show that the resulfurization quantity of hot metal is lower when the rate of slag skimming increases above 98%. The combing measure of using high quality scrap steel,and free of iron piece addition,and 15 kg/t of cold-bound pellets ratio can guarantee the end [S] content of BOF less than 0.006%. The ability of desulfurization is weak in RH,the rate of RH desulfurization depends on the desulfurizer consumption and the [O] content before alloying. The [O] content should be controlled at less than 450 × 10^-6 in the liquid steel. By increasing the rate of slag skimming,controlling sulfur source and the [O] content of molten steel,the unqualified rate of silicon steel due to [S] dropps by 75% and the desulfurizer consumption will decrease by 17.72%.