Abstract: The metallurgical process flowsheet of produced steel SA-210A1 for high pressure boiler (/% : 0. 08 ~ 0. 11C, 0.22 ~0.24Si, 0. 72 ~0.74Mn, 0. 007 ~0.010P, 0.004 ~ 0.005S, 0.010 〜0.015V, 0.025 ~ 0.035Ti, 0. 012 - 0. 018Alt) is 55% hot metal + scrap- 100 EAF-LF-VD-Φ500 mm bloom casting-hot rolling to Φ130 mm Round bar. With the process measures including low aluminium deoxidation process- EAF end controlling [C] ≤ 0. 06% and [P] 0. 006% ~0. 010% , adding lime 12 kg/t, AD powder (/% : 10 ~ 13A1, 55 ~ 60Al₂O₃, 5 - 8SiO₂,5 ~8MgO) 3 kg/t and 70% Al aluminium cable steel 3 kg/t in tapping liquid for pre-oxidation ； using 5. 76 ~6. 06 high basicity Al₂O₃ slag series in LF refining, feeding 0. 40 kg/t calcium wire at end of LF and sift stirring for ^10 min； super-heating extent of liquid in tundish 15 ~25 ℃，using mold and end electromagnetic stirring process in casting, casting speed 0. 31 ~0. 32 m/min and casting bloom slow cooling for "48 h, the steel SA-210A1 steel [O] is 16 x 10^-6 ~24 x 10^-6, [N] is 65 x 10^-6 ~ 80 x 10^-6 and [Alt] is ≤ 0. 020% , the macrostructure and nonmetallic inclusions in casting bloom and hot-rolled round bar all meet the requirements.

摘要： 生产的高压锅炉用钢SA-210A1（/%:0.08～0.11C,0.22～0.24Si,0.72～0.74Mn,0.007～0.010P,0.004～0.005S,0.010～0.015V,0.025～0.035Ti,0.012～0.018Alt）的冶金工艺流程为55%铁水+废钢-100 t EAFLF-VDΦ500 mm坯连铸-轧制成Φ130mm圆钢。通过低铝脱氧工艺-EAF终点控制[C]≤0.06%,[P]0.006%～0.010%,出钢加石灰12 kg/t,AD粉（/%:10～13A1,55～60Al₂O₃,5～8SiO₂, 5～8Mg0）3 kg/t,700%Al钢芯铝3 kg/t预脱氧;LF采用5.76～6.06高碱度Al₂O₃渣系,LF终点喂0.40 kg/t钙线,软吹≥10 min;中间包钢水过热度15～25℃连铸结晶器和末端电磁搅拌,拉速0.31～0.32 m/min,铸坯缓冷≥48 h等工艺措施,SA-210A1钢中的[O]16×10^-6~ 24×10^-6,[N]65×10^-6～80×10^-6,[Alt]≤0.020%,铸坯和热轧圆钢低倍组织和非金属夹杂物均满足要求

关键词: 高压锅炉用钢SA-210Al, 100 t EAF-LF-VD , Φ500 mm坯连铸, 低铝脱氧工艺, 高碱度心Al₂O₃渣系, 生产实践