Abstract: Medium carbon sulfur free-cutting steel 1141 (%:0.37～0.45C,1.20~1.65Mn,0.06～0.12S) and steel 1144 (%:0.40~0.48C,1.35~1.65Mn,0.24~0.33S) are melted by 65 t Consteel EAF-LF(VD)-(150～200) mm ×(150～200) mm CC flow sheet.With feeding Al wire during refining to control [Al] 0.02%~0.05%,end-refining-slag basicity (CaO/SiO₂) 2.62~3.02 to keep sulfide capacity in end refining up to saturation state,and blowing argon 200~250 L/min,≥ 15 min during VD process,the [S] of steel 1141 before and after VD is respectively 0.11%~0.12% and 0.10%～0.12%,and the [S] of steel 1144 before and after VD is respectively 0.30%～0.33% and 0.29%~0.30%,therefore the sulfur content in steel before and after VD process is constant.

Key words: Medium Carbon, Sulfur Free-Cutting Steel, LF(VD)

摘要： 中碳硫系易切削钢1141(%:0.37～0.45C、1.20～1.65Mn、0.06～0.12S)和1144(%:0.40～0.48C、1.35～1.65Mn、0.24～0.33S)由65 t Consteel电弧炉-LF(VD)-(150～200)mm×(150～200)mm CC流程生产。LF精炼时喂Al线,控制[Al]0.02%～0.05%,精炼渣CaO/SiO₂ 2.62～3.02,使精炼中后期渣中硫化物容量达到饱和,在VD处理时吹氩200～250 L/min,≥15 min,使1141钢[S]在VD前后分别为0.11%～0.12%和0.10%～0.12%,1144钢[S]VD前后分别为0.30%～0.33%和0.29%～0.30%,稳定了VD处理前后钢中的硫含量。

关键词: 中碳, 硫系易切削钢, LF(VD)