Strategy of flatness control for thin and wide Q500qE plate

Taking Q500qE of 10 mm×3 650 mm×12 000 mm as an example，the difficulties are low yield ratio，high cooling strength，adaptability of tooling equipment and etc，which can increase the difficulty of the flatness control. The processes such as the plan arrangement，roller campaign，heating，rolling，cooling and straightening are optimized and the corresponding strategy is formulated，which can realize the good control of the thin and wide plate flatness of Q500qE. The plate flatness qualification rate is significantly increased，and all of the properties are good.