Abstract: According to the situation of over-high S content in deep drawing hot rolled DDQ class SPHE strip steel (%: ≤O. 07C, ≤0. 03Si, 0. 20 〜0. 30Mn, ≤0. 020P, ≤0. 010S, 0. 02 ~0. 06Als) produced by 100 t BOF-argon stir- ring-LF-RH-Ca treatment flow sheet, the effect of CaO/SiO₂, A1₂O₃ and MgO on refining slag sulfur partition ratio Ls is analyzed by KTH sulfur capacity model and the desulphurization model of CaO-MgO-SiO₂ -Al₂ O₃ quaternary slag series is established to optimize the ingredient of LF refining slag for desulphurization. Results show that after using optimizing refining slag (%: 50CaO, 6MgO, ≤5SiO₂, 30 - 35Al₂O₃), the desulphurization ratio of LF refining liquid steel is ≥80%, the ±5% error between prediction value by model and measured value makes up ≥80% of total prediction value.

摘要： 根据钢厂100 t BOF-吹氩-LF-RH-Ca处理流程生产优质深冲(DDQ)级深冲热轧带钢SPHE(%:≤0.07C、≤0.03Si、0.20～0.30Mn、≤0.020P、≤0.010S、0.02～0.06Als)时Ca处理过程S含量过高的情况,通过KTH硫容量模型,分析了CaO/SiO₂、Al₂O₃和MgO对精炼渣硫分配比LS的影响,建立了CaO-MgO-SiO₂-Al₂O₃四元渣系脱硫模型,优化LF脱硫的精炼渣成分。结果表明,使用优化后的精炼渣(%:50CaO、6MgO、≤5SiO₂、30～35Al₂O₃),LF精炼钢水的脱硫率≥80%。模型预测值与实测值误差为±5%的占80%。