ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2014, Vol. 35 ›› Issue (2): 33-36.

• 工艺技术 • 上一篇    下一篇

50 t EBT EAF-LF( VD) -CC流程生产G55SiMoVA轴承钢的工艺实践

杨密平   

  1. 山东钢铁股份有限公司莱芜分公司特钢事业部,莱芜 271105
  • 收稿日期:2013-10-09 出版日期:2014-04-01 发布日期:2022-09-09
  • 作者简介:杨密平( 1979-),男,硕土(北京科技大学),安徽工业大学(本科)毕业,工程师,炼钢和连铸工艺技术监督和管理。

Process Practice of Bearing Steel G55SiMoVA Produced by 50 t EBT EAF-LF (VD)-CC Flow Sheet

Yang Miping   

  1. Special Steel Division , Laiwu Branch , Shandong Iron and Steel Corp Ltd , Laiwu 271105
  • Received:2013-10-09 Published:2014-04-01 Online:2022-09-09

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,10~16SiO2,11~13Al2O3,4.5~7.0MgO)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

关键词: G55SiMoVA轴承钢, 50 t EAF-LF(VD)-CC流程, 总氧含量, 夹杂物

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, EBT tapping and alloying, controlling basicity 3.2-4.5 of LF secondary refining slag (/% : 46-54CaO, 10-16SiO2, 11-13Al2O3 , 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 G55SiMoVA rolled products is 9 X 10-6-10 x 10-6

Key words: Bearing Steel G55SiMoVA, 50 t EAF-LF (VD)-CC Flow Sheet, Total Oxygen Content, Inclusion