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石油钻具用轴承钢G55SiMoVA(/%:0.52 ~0.55C,0.90~1.10Si,0.30~0.50Mn,0.40~0.60Mo,0.20 ~0.30V,≤0.015P,≤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,10~16SiO2,11~13Al2O3,4.5~7.0MgO)碱度3.2