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.