Abstract: During 70 t EAF-LF melting steel 20MnSi,the desulphurizing refining time for average sulphur content in steel from 0.060% to 0.015% decreased to 20~30 min from original 30~45 min by adding lime 400~450 kg and synthetic slag 80~250kg,controlling EAF tapping steel temperature 1580~1630℃,increasing refining slag amount, ensuring refining slag basicity 1.5~2.8,Ar stirring rate 180~280  L/min and average(TFe)≤1.0%.

摘要： 在70 t EAF-LF冶炼20MnSi钢过程中,通过EAF出钢时加石灰400～450 kg和合成渣80-250 kg,控制EAF出钢温度1 580～1 630℃,增加精炼渣量,保证精炼渣碱度为1．5-2．8,吹Ar搅拌流量为180～280 L/min, (TFe)平均≤1．0％,可使钢中平均硫含量由0．060％降至0．015％,精炼时间由30～45 min降低至20-30 min。

关键词: EAF-LF, 脱硫, 碱度, , Ar 搅拌