Coiling scratch

Defect Name: coiling scratch < br / > definition and appearance: < br / > linear, point and block damage defects with irregular short cluster distribution on the surface of steel strip along the rolling direction are called scratch. The flat scratch is relatively smooth, and the finishing scratch has hand feel and metal luster& nbsp;  & nbsp; Causes: < br / > ● low coiling tension and high uncoiling tension, resulting in relative movement between steel strip layers< Br / > ● when swinging the tail, the tension is out of balance, and the steel strip surface is scratched due to staggered movement between layers< Br / > hazard: < br / > the scratch is easy to rust and affect the coating effect; During the stamping process, the scratch is easy to crack< Br / > prevention and elimination methods < br / > ● control the coiling tension of the steel belt, and the steel belt shall be tightly rolled and bound< Br / > ● control the shape of the steel strip, and slow down and level the bulge, bulge, loose coil and heart-shaped coil< Br / > inspection and judgment: < br / > ● visual inspection< Br / > ● judge according to scratch (scratch) defects. < br / >