Abstract: The steelmaking process of steel 4147 for high pressure cylinder (/% : 0. 46 ~0. 50C, 0.15 〜0. 35Si, 0.8-1. OMn, ≤0. 015P, ≤0. 008S, 0. 85 ~ 1. lOCr, 0. 15 ~0. 25Mo, 0. 02 ~0. 04Al) at Yonggang is 110 t EBT EAF- LF-VD-Φ500 mm round bloom CC. With using charging 80% hot metal + 20% scrap to control (Pb + As + Sn + Sb + Bi) ≤150 x 10^-6 , controlling EAF end [C] NO. 08% and end [ P]≤ O. 006% and adding 1. 0 kg/t Al during tapping； using LF synthetic refining slag (/% : 40 ~55CaO, 20 ~ 30Al₂O₃, ≤6MgO, ≤4.0SiO₂, ≤1.5FeO), the sulphur content in finished liquid is <0.002% with T [O] ≤17 x 10^-6，[N] ≤32 x 10^-6, [ H]≤ 0. 9 x 10^-6, and (Pb + Sn + Sb + As + Bi) ≤0, 013 7% ； the rating of center porosity and shrinkage pipe of casting round bloom is ≤1. 5, and the rating of each inclusion in rolled products is ≤ 0. 5 to meet the requirement of quality for high pressure cylinder.

摘要： 永钢高压气瓶钢4147(/%:0.46~0.50C,0.15~0.35Si,0.8~1.0Mn,≤0.015P,≤0.008S,0.85~1.10Cr,0.15~0.25Mo,0.02~0.04Al)的冶炼工艺为110 t EBT电弧炉-LF-VD-Φ500 mm圆坯连铸。通过使用炉料80%铁水+20%废钢, 控制(Pb+As+Sn+Sb+Bi)≤150×10^-6,EAF终点[C]≥0.08%,终点[P]≤0.006%,并在出钢过程加1.0 kg/t Al;以及采用LF精炼合成渣（/%:40~55CaO,20~30Al₂O₃,≤6MgO,≤4.0SiO₂,≤1.5FeO),成品硫含量≤0.002%,T[O]≤17×10^-6,[N]≤32×10^-6,[H]≤0.9×10^-6,(Pb+Sn+Sb+As+Bi)≤0.013 7%;连铸圆坯中心疏松、缩孔≤1.5级,轧材各类夹杂物均≤0.5级,满足高压气瓶钢质量要求。

关键词: 高压气瓶钢4147, , Φ500 mm连铸圆坯110 t EBT EAF-LF-VD-CC流程, 硫含量, , 气体含量