3.0 galvanized sheet has creases. According to Shun Kai's inquiry. Com, the thicker the steel strip is, the more serious the crease is, and the more layers are transferred, so the galvanized sheet of 3.0 has creases. Crease is a kind of straight and prominent mark which is usually perpendicular to the length direction of steel coil and runs through the whole page. The origin of crease marks is in the inner ring of steel coil, and the leading edge of the inner ring is squeezed, which leads to the plastic deformation of adjacent steel plates and transfers the leading edge marks layer by layer.