Abstract: The microalloying steel 15Mn2CrVNbE(0. 13~0. 17C,1.44～1.59Mn,0.30～0.60Cr,0.02～0. 10V,  0.02~0.05Nb,0.02~0.05Al)for trigging girder has been produced by hot metal desulphurizing -80 t LD melting-LF (feeding wire)refining - 4 strand billet concasting process at No3 steelmaking plant,Shougang. The production results (149 heats)showed that with control of Al content in steel,argon stirring,feeding silicon-caleium wire,whole course  shielding casting technology,the oxygen content in billet was(7～26)×10^-6,nitrogen content was(29～79)×10^-6, and the mechanical properties of trigging girder products were σ_s465～575 MPa,  σ_b630～720  MPa,δ₅25%~34%  and -40 ℃ longitudinal impact energy 36~183 J,which met the requirement of service.

Key words: Microalloying Steel 15Mn2CrVNbE, Trigging Cirder, LD-LF Process

摘要： 首钢三炼钢厂采用铁水脱硫-80tLD冶炼-LF(喂丝)精炼-4流方坯连铸工艺生产制动梁用微合金化钢15Mn2CrVNbE(%:0.13～0.17C、1.44～1.59Mn、0.30～0.60Cr、0.02～0.10V、0.02～0.05Nb、0.02～0.05Al)。通过控制钢中Al含量、吹氩、喂硅钙线和全程保护浇铸等工艺措施,149炉生产结果表明,铸坯中氧含量为(7～26)×10^-6,氮含量为(29～79)×10^-6。制动梁成品的力学性能为σ_s465～575MPa,σ_b630～720MPa,δ₅25%～34%,-40℃纵向冲击功36～183J,满足使用要求。

关键词: 微合金化钢15Mn2CrVNbE, 制动梁, LD-LF工艺