Abstract: By optimizing the temperature control of LF inlet molten steel, argon blowing control and slagging control, the average temperature of LF inlet molten steel increased from 1 552 ℃ to 1 573 ℃, the roughing slag amount decreases from 60 mm to 45 mm, the stirring energy of molten steel is about 9 000 W/t in LF desulphurization, the average w(FeO) of LF inlet steel slag reaches 1.04 %, and was about 0.5 % in refining process. The basicity of refining slag reached 2.9—3.2, the average first desulfurization rate increased from 59.87 % to 85.54 %, and the refining cycle shortened from 58.3 min to 47.9 min. The production rhythm was accelerated and the production cost was reduced.

Key words: LF, temperature control, argon blowing, slaging, the first desulphurization rate, refining cycle