Using continuous casting slabs or blooming slabs as raw materials, using a walking furnace to heat, high-pressure water dephosphorization and then entering the rough rolling mill, the rough rolling material is cut into the head and tail, and then enters the finishing mill to implement computer-controlled rolling. After finishing rolling, it goes through laminar cooling (computer-controlled cooling rate) and coiling by a coiler to become a straight coil. The head and tail of straight rolls are often tongue-shaped and fish-tail-shaped, with poor thickness and width accuracy, and the edges often have defects such as waves, folds, and towers. The coil weight is heavier, and the inner diameter of the steel coil is 760mm.