Abstract: Composition of LF Slag System CaO 50%～58%、Al2O3 27%～35%、SiO2≤10%、MgO≤10%、（TFe+MnO）≤1.0%;,MI range 0. 25 ~ 0. 30, R range 8 ~ 9. 5, ( CaO)/( A1₂O₃ ) range 1. 6 ~ 1. 9, Als content is 0. 010% ~ 0. 020%. The LF slag system has good desulfurization effect and quick slag formation. Without pretreatment of hot metal, it can meet the requirement of producing S≤15 X 10 ^-6 ultra-low sulphur pipeline steel L245NCS

摘要： LF精炼渣系控制在CaO 50%～58%、Al₂O₃ 27%～35%、SiO₂≤10%、MgO≤10%、（TFe+MnO）≤1.0%,MI范围0.25～0.30,R范围8～9.5,（CaO）/（Al₂O₃）范围1.6～1.9,Als含量0.010%～0.020%。渣系脱硫效果好,化渣快,可在无铁水预处理的情况下,满足生产成品S≤15×10^-6超低硫管线钢L245NCS的要求。

关键词:  , 超低硫管线钢, S≤ 15x10^-6, , LF精炼渣系