【摘要】 分析莱钢50 t EAF-LF(VD)-CC冶炼工艺各期GCr15轴承钢中氮含量的变化,得出电弧炉终点[N]为(23～36)×10-6,成品材N含量为(79-104)×10-6。为降低轴承钢中的N含量,采取电弧炉兑入铁水量≥35％、用低氮增碳剂、优化LF精炼操作、VD真空度≤67 Pa、长水口和氩气保护浇铸等措施,使GCr15轴承钢材的平均氮含量从91．6×10-6降至54．8×10-6。更多还原

【Abstract】 The nitrogen content in GCr15 bearing steel at each melting phase in 50 t EAF-LF(VD)-CC process was analyzed to obtain that the EAF end [N] was (23-36)×10-6 and the N content in products was (79-104)×10-6. In order to decrease the N content in bearing steel, with charging≥35% hot metal in EAF, using low nitrogen carbonizing agent, optimizing Lf refining operation, VD vacuum≤67 Pa, long nozzle and argon shielding casting, the average nitrogen content in GCr15 bearing steel products decreased to 54.8×10-6 from original 91.6×10-6.更多还原