110 t UHP EAF-LF-RH-CC流程生产GCr15轴承钢的工艺实践

马钢特钢公司生产GCr15轴承钢的流程为110 t UHP EBT EAF-120 t LF-RH-Φ380~Φ600 mm圆坯连铸工艺。通过控制EAF终点C]≥0.10%,下渣量≤2.0 kg/t钢,出钢用铝铁预脱氧;LF终渣(/%):50~60CaO、5~6MgO、8~15SiO₂、15~20Al₂O₃,RH 67 Pa时间≥10 min,连铸结晶器、铸流、凝固末端电磁搅拌等工艺措施,使钢中总氧含量-TO]≤8×10^-6,Φ130 mm材中A、B、C、D夹杂物≤1.0级,Ds夹杂0级,满足对产品冶金质量的要求。

Process Practice for Production of Bearing Steel GCr15 by 110 t UHP EAF-LF-RH-CC Flow Sheet

The flow sheet for production of bearing steel GCr15 at Special Steel Co, Masteel is 110 t UHP EBT EAF- 120 t LF-RH-Φ380 ?Φ600 mm round bloom CC process. By using the process measures including controlling EAF end C] 30. 10% , slagging down quantity W2. 0 kg/t steel, using ferro-aluminium to pre-deoxidize in tapping, LF end refining slag (/% ) : 50 ~60CaO, 5 ~6MgO, 8 ~15SiO₂, 15 ~ 20Al₂O₃ , RH 67 Pa keeping ≥10 min and electromagnetic stirring with M-EMS, S-EMS and F-EMS, the total oxygen content in steel- TO] is ≤8x10^-6 and in Φ130 mm round products the rating of A, B, C and D series inclusions is ≤1.0, and the rating of Ds series is 0, all meet the requirement on metallurgy quality of products.