Abstract:  The steel T27(0. 10~0. 16C,0. 15~0.25Cr,0.025～0.045Al)for railway belongs in peritectic steels which was produced by 45%～60% hot metal + scrap-50tEAF-LF(VD)-caster flow sheet at special steel plant,Lai  Steel. With EAF charging hot metal≥45%,adjusting oxygen supply,ensuring end carbon 0.08%～0. 10%,partly re- placing silicomanganese by steel cored aluminium for refining during EAF tapping,controlling refining basicity 4 and argon  blown parameters,controlling overheating 20~30 ℃ of steel in tundish,mold water rate 180 m³/h and viscosity of shield  slag0.85±0.05 Pa · s,the oxygen content in steel was lower to(15～20)×10^-6,the qualified rate of cast billet ≥  99.95%,and the quality of steel products met the requirements of standard GB/T700- 1988.

Key words:  , EAF-LF(VD)-CC,End Point Carbon Control,Steel T27,Peritectic,Shield Slag

摘要： T27铁路用钢(%:0.10～0.16C、0.15～0.25Cr、0.025～0.045Al)为包晶钢。莱钢特殊钢厂采用45%～60%铁水+废钢-50 t电弧炉-LF(VD)-连铸机工艺路线生产T27钢。通过电弧炉热装铁水≥45%,调节供氧量,确保终点碳为0.08%～0.10%,电弧炉出钢过程用部分钢芯铝替代硅锰合金进行脱氧,精炼渣碱度为4,控制精炼吹氩参数,控制中间包钢水过热度20～30℃,结晶器配水量180 m³/h,保护渣黏度为(0.85±0.05)Pa·s,使钢中的氧含量为(15～20)×10^-6,连铸坯合格率≥99.95%,钢材质量符合GB/T700-1988标准要求。

关键词: EAF-LF(VD)-CC, ,  终点碳控制, , T27钢, , 包晶, , 保护渣