Vol.29 Suppl.1 王谦等：低碳含铝钢LF炉精炼工艺及精炼渣的优化 ·17· taining steel.To enhance the desulfurizing and inclusion absorption for the liquid steel,the compositions of the final refining slag in LF can be chosen as:CaO=55%-60%,SiO2=4%-7%,Al2O3=28%-32%,MgO=4%-8%(mass fraction),and CaO/Al2O3=1.7-1.9.During the tapping,most of the refining slag was added into the ladle to real- ize slag filtration.The oxidizing slag tapped into the ladle from BOF was reduced in the end of tapping.And enough time was kept to killing the liquid steel with Ar soft blowing.By all of above methods,the steel grade of 16MnR was refined with a better result as:the desulfurizing ratio was 61.8%,the total oxygen content T[O]in slab decreased to 22x10-6,and the macro inclusions(250 um)in slab also dropped down to 15.68 mg/10 kg steel. KEY WORDS ladle furnace(LF);refining;low carbon steelVol.29 Suppl.1 王谦等：低碳含铝钢 LF 炉精炼工艺及精炼渣的优化 • 17 • taining steel. To enhance the desulfurizing and inclusion absorption for the liquid steel, the compositions of the final refining slag in LF can be chosen as: CaO=55%-60%, SiO2=4%-7%, Al2O3=28%-32%, MgO=4%-8% (mass fraction), and CaO/Al2O3=1.7-1.9. During the tapping, most of the refining slag was added into the ladle to real￾ize slag filtration. The oxidizing slag tapped into the ladle from BOF was reduced in the end of tapping. And enough time was kept to killing the liquid steel with Ar soft blowing. By all of above methods, the steel grade of 16MnR was refined with a better result as: the desulfurizing ratio was 61.8%, the total oxygen content T[O] in slab decreased to 22×10−6 , and the macro inclusions (≥50 µm) in slab also dropped down to 15.68 mg/10 kg steel. KEY WORDS ladle furnace (LF); refining; low carbon steel