120 t LD-LF-RH-BCC流程生产齿轮钢的氧含量控制工艺

分析了齿轮钢中氧含量控制的关键技术:精炼渣SiO₂含量,(CaO)/(Al₂O₃),(FeO+MnO),RH,氩气搅拌,连铸工艺。结合攀枝花新钢钒股份有限公司炼钢厂的工艺条件,通过控制转炉终点[C]≥0.10%,钢包渣厚50～80 mm,出钢过程加高碱度精炼渣,LF白渣精炼[渣中T.Fe-0.43%,(MnO+FeO)-0.93%,SiO₂-5%,平均(CaO)/(Al₂O₃)-1.9],20 min RH处理,连铸保护浇铸等工艺措施,并在炉后平台,LF精炼和钙处理过程采用合适的吹氩模式,使20CrMoH齿轮钢铸坯总氧含量≤15×10^-6,平均总氧含量为11.8×10^-6。

Controlling Technology on Oxygen Content in Gear Steel Produced by 120t LD-LF-RH-BCC Flow Sheet

The key technology for controlling the oxygen content in gear steel is analyzed including SiO₂ content in refining slag, (CaO)/( A1₂O₃) , (FeO + MnO) , RH, Ar stirring and concasting process. Combined with process conditions at Vanadium Recovery and Steelmaking Plant, Panzhihua New Steel-Vanadium Co Ltd, with the process measures such as controlling converter end [C] ≥0. 10% , ladle slag thickness 50 ~ 80 mm and adding high basicity slag during tapping, LF white slag refining [ in slag T. Fe-0. 43% , ( MnO + FeO)-0. 93% , SiO₂-5% , average (CaO)/(Al₂0₃ ) -1. 9] , RH treatment for 20 min, shielded continuous casting, and using suitable argon blowing models in ladle at back platform of converter, during LF refining and calcium treating, the total oxygen content in bloom of gear steel 20CrMoH is ≤15 X 10^-6, and the average total oxygen content is 11. 8 x 10^-6.