Abstract: New LZ45CrV steel blooms (/% : 0. 43C, 0. 27Si, 0. 77Mn, 0. 007P, 0. 005S, 0. 55Cr, 0. 10V, 0. 10Mo) of 260 mm x260 mm and 280 mm x280 mm for heavy load railway axle at daye special steel are pilot-produced by the flow sheet 60 t UHP EBT EAF-LF-VD-6. 5 t ingot-850 primary mill rolling process. With process measures including EAF charging 45% hot metal and quality scrap, controlling end [ C]≥0. 15% and [ P] ≤0.005% , feeding aluminium wire in LF refining to control 0. 035% ~0. 045% Al and VD vacuum treatment m20 min, the oxygen content in LZ45CrV steel bloom is 8. 5 x 10^-6 , rating of nonmetallic inclusions ≤1.0, rating of grain size 7 ~ 8, and the mechanical properties of steel bloom meet the requirement of standard and design.

Key words: LZ45CrV Steel Bloom for Heavy Load Railway Axle, 60 t EBT EAF-LF-VD-6. 5 t Ingot Flow Sheet, Cleanliness, Development

摘要： 大冶特钢采用60tUHP EBT EAF-LF-VD-6.5t铸锭-850初轧开坯的工艺流程试制了大轴重车轴用260mm×260mm和280mm×280mm新型LZ45CrV钢坯(/%:0.43C、0.27Si、0.77Mn、0.007P、0.005S、0.55Cr、0.10V、0.10Mo)。通过电弧炉配加45%铁水和优质废钢,控制终点[C]≥0.15%,[P]≤0.005%,LF喂铝线,使Al控制在0.035%～0.045%,VD真空处理≥20min等工艺措施,LZ45CrV钢坯的氧含量为8.5×10^-6,非金属夹杂物≤1.0级,晶粒度7～8级,力学性能符合标准和设计要求。

关键词: 大轴重车轴用LZ45CrV钢坯, 60 t EBT EAF-LF-VD-6. 5 t铸锭流程, 洁净度, 研制