Operation method for reducing contusion defects of flat surface of thin-gauge strip steel

The invention relates to an operation method for reducing the flat surface contusion defect of thin-gauge strip steel, and belongs to the technical field of hot-rolled strip steel leveling processes in the metallurgical industry. According to the technical scheme, when an uncoiler builds tension, the time for increasing the tension from 0 to a set value is 2-3 s, and the leveling speed of a leveling machine is controlled to be 250 m/min or below; the tension set value of the uncoiler is 40-50 kN, when 200-250 m of strip steel is left on the uncoiler, the tension of the uncoiler is reduced to 30-35 kN, when 200-250 m of strip steel is left on the uncoiler, the flattening speed of the flattening machine starts to be reduced, and the speed reduction slope is 0.136 m/s < 2 >. The method has the beneficial effects that the surface contusion defect of the thin strip steel with the thickness smaller than or equal to 3.0 mm in the flattening process can be reduced, so that the surface quality of the steel coil and th