≤0.015S)的工艺流程为废钢+60%~70%铁水-50 t UHP EBT EAF-60 t LF-VD-260 mm×300 mm连铸。通过采用电弧炉全程泡沫渣埋弧操作
EBT出钢合金化
控制LF二次精炼渣(/%:46~54CaO
10~16SiO
2
11~13Al
2
O
3
4.5~7.0MgO)碱度3.2~4.5
SiC扩散脱氧和60~80 L/min流量氩气搅拌
VD 67 Pa真空状态下保持20 min
连铸全程保护浇铸
所生产G55SiMoVA轴承钢轧材中氧含量为9×10
-6
~10×10
-6
。
Abstract
The flow sheet for bearing steel G55SiMoVA for oil drilling tool (/% : 0.52-0.55C
0.90-1.l0Si
0.30-0.50Mn
0.40-0.60Mo
0.20-0.30V
≤0.015P
≤0.015S) is scrap+60%-70% hot metal-50 t UHP EBT EAF-60 t LF-VD-260 mm x 300 mm CC process. With using foaming slag submerged arc operation in whole period of arc furnace steelmaking