摘要
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,10~16SiO_2,11~13Al_2O_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)。
t The flow sheet for bearing steel G55SiMoVA for oil drilling tool （/% ： 0. 52 ~ 0. 55C, 0. 90 - 1.10Si, O. 30 -0. 50Mn, O. 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 ×300 mm CC process. With using foaming slag submerged arc operation in whole period of arc furnace steelmaking, EBT tapping and alloying, controlling basicity 3.2 ～ 4. 5 of LF secondary refining slag （/% ： 46 - 54Ca0, 10 - 16SiO2 , 11 - 13A1203 , 4. 5 - 7. 0MgO）, diffusion-deoxidizing by SiC with 60 - 80 L/min Argon stirring, VD for 20 min in vacuum below 67 Pa, and shielding casting in whole period, the oxygen content in bearing steel G55SiMoA rolled products is 9 × 10-6 - 10× 10-6
出处
《特殊钢》
北大核心
2014年第2期33-36,共4页
Special Steel
