Abstract: In order to study the desulphurization efficiency during LF refining ship plate and low carbon steels, every affecting factor is studied, the calculation results showed that only the initial sulfur content below 0.027% sulfur quantity in liquid steel could be removed below 0. 01% within 35 min which is LF average processing period； when controlling the slag (FeO + MnO) quantity below 0. 5% , basicity at 4, and MgO at 20% an 12% respectively, desulfurization efficiency is best； sulfur quantity is removed below 0.010% , then controlling dissolved oxygen in steel below 16 x10^-6 , sulfur quantity is removed below 0. 003% , then controlling dissolved oxygen in steel below 5 X 10^-6;the slag quantity is controlled at 15 〜20 kg/t - steel, controlling the gas flow rate at 0. 6 ~0. 8 m³/min suitably; sulfur quantity decreased fastest in the first 20 mins,it could be controlled below 0. 010% in steel, then it decreased gradually, if sulfur quantity is removed to 0. 005% , refined processing time is more than 30 min usually.

摘要： 为了分析船板钢和低碳钢LF精炼过程脱硫效率,对各影响因素进行了分析研究,结果表明,在LF平均处理周期35 min以内,钢水中的硫脱除至0.010%以下,初始硫含量要低于0.027%;炉渣（FeO+MnO）含量控制在0.5%以下,碱度控制在4,Al2O3与MgO分别控制在20%和12%,脱硫效率最佳;硫含量脱除至0.010%以下,处理前钢水中的溶解氧尽量控制在16×10^-6以下,硫含量脱除至0.003%以下,钢水中的溶解氧尽量控制在5×10^-6以下;渣量控制在15～20 kg/吨钢,吹氩量控制在0.6～0.8m³/min比较适宜;前20 min内硫含量的降低速度最快,能够将钢水中的硫控制在0.010%以下,之后硫含量降低速度趋于平缓,为使硫脱至0.005%,精炼处理时间通常需要30 min以上。