Q345 Ultra-Heavy Plate Rolled with Temperature Gradient

It seems to be generally acceptable that recrystallization-controlled rolling is used to produce ultra-heavy plate. However, due to large thickness of the slab, it is difficult to make enough plastic deformation, occurred in central layer. This leads to coarse grain in the center and heterogeneity of property along thickness direction. In this study, the effect of temperature gradient on the strain and austenite grain recrystallization was investigated during ultra-heavy plate rolling by means of FEM and experiments. Results indicate that gradient temperature rolling is better for increasing strain and enhancing austenite recrystallization in the center of ultra-heavy plate.