Abstract: The production flow sheet for (6～× (1600   ×3200) mm plate of developed low carbon bainitic steel Q650(%:0.06~0.08C,1.6~1.8Mn, ≤0.3Cr, ≤0.06Nb, ≤0.02Ti, ≤, ≤0. 15Mo, ≤0.05V, ≤0.002B) is hot metal pretreatment - 120 t converter - LF refining -slab casting - control rolling and cooling process.With controlling single pass   deformation≥15% in recrystallization zone   and   accumulated   deformation≥50%, and passes   accumulated   deformation≥60% in un recrystallization zone, controlling cooling speed 15 ℃/s and end cooling 500 ℃, the steel has different type of bainite transformation structure and excellent comprehensive porperties. 

Key words: Low Carbon Bainite Steel, Development and Production, Control Rolling and Control Cooling, Structure. 

摘要： 开发的低碳贝氏体钢Q650(%:0.06～0.08C、1.6～1.8Mn、≤0.3Cr、≤0.06Nb、≤0.02Ti、≤0.15Mo、≤0.05V、≤0.002B) (20～× (1 600～3 200) mm钢板的生产流程为铁水预处理-120 t转炉-LF精炼-连铸-控轧-控冷。通过控制再结晶区单道次变形量≥15%,累积变形量≥50%,未再结晶区道次累积变形量≥60%,冷却速度15℃/s,终冷温度≥500℃,可获得不同类型的贝氏体相变组织,并具有良好的综合性能。

关键词: 低碳贝氏体钢, 研制, 控轧控冷, 组织, 性能