Abstract: The modification of ladle top slag is an important technological method to prevent secondary oxidation of molten steel, deep deoxidization of molten steel and optimize the removal of inclusions in molten steel. By using 120 t BOF- LF-Plate production line to produce low carbon aluminum killed steel SPHC and 330CL, in LF refining with using carbon- aluminum modifier (/% : ≥35Al₂O₃,15~30C,5~15Al, ≤5SiO₂ ,6 - 12CaF₂) , as compared with using carbon-free top slag modifier (/% : 40 ~ 60Al₂O₃, ≥20Al,2 ~10CaO, ≤10SiO₂ ) , liquid N increment dicreases from 0.000 5% ~ 0.001 5% to ≤0. 001%, rate of desulphurization increases from 40% to 45%

摘要： 钢包顶渣的改质是防止钢水二次氧化、钢液深度脱氧、优化钢液和夹杂物去除的重要工艺方法。120 t转炉+LF +板材生产线生产低碳铝镇静钢SPHC和330CL时,LF精炼采用碳铝改质剂(/%: ≥35Al₂O₃，15~30C，5~15Al， ≤5SiO₂，6 ~12CaF₂ )较无碳改质剂 (/%：40~ 60Al₂O₃， ≥20A1，2~ 10CaO，≤10SiO₂)钢水增氮量从0.000,5% ~0.0015% 降至≤0.001%，脱硫率从40%增至45%。

关键词: 钢包顶渣, 复合改质剂, 泡沫渣, 钢液增碳