无铁水预处理超低硫管线钢L245NCS的生产实践

Production Practice of Ultra-Low Sulphur Pipeline Steel L245NCS without Pretreatment of Hot Metal

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。

Composition of LF Slag System CaO 50%~58%、Al2 O3 27%~35%、SiO2≤10%、MgO≤10%、(TFe+MnO)≤1.0%,MI range 0.25~0.30,R range 8~9.5,(CaO)/(Al2 O3) 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≤15×10-6 ultra-low sulphur pipeline steel L245 NCS.