【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σs465～575MPa,σb630～720MPa,δ525%～34%,-40℃纵向冲击功36～183J,满足使用要求。更多还原

【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-calcium 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_s 465～575 MPa,σ_b 630～720 MPa,δ₅ 25%～34% and-40 ℃ longitudinal impact energy 36～183 J,which met the requirement of service.更多还原