High-uniform longitudinal-and-transverse toughness wide-width steel plate and TMCP process production method thereof

The invention relates to a high-uniform longitudinal-and-transverse toughness wide-width steel plate and a TMCP process production method thereof. A conventional-size continuous casting slab with ingredients reaching the requirement is reheated, and the heated continuous casting slab is rolled to have the final finished product thickness through manners of widening and longitudinal rolling in sequence. Through the optimized matching design of a heating system, the rolling temperature, the deformation amount in each stage, the gate interval time, the rolling speed and a cooling system, the effect of the rolling effect of a high temperature zone and a low temperature zone on original austenite grain refining and phase change promotion is sufficiently used, the type and form of a phase changetransformation product are reasonably controlled, and high-uniform longitudinal-and-transverse performance and online direct production of an accurate shape and size large thickness wide plate are achieved. The maximum thick