The surface presents uneven wrinkles, which occur mostly in a necessarily appear cold rolled coil steel of less than 0.8 mm. The edges of the wrinkles are at an angle and are severely creased into pleats.
Strip steel runs off, stretching on one side, and wrinkles on the other side;
The shape of the plate is bad, there is a large side wave or a middle wave, and when the strip is over-leveling machine, straightening machine or pinch roll, wrinkles are generated at the wave shape;
Straightening machine is improperly adjusted and caused by uneven deformation.
GRADE | C percent max | Mn percent max | P percent max | S percent max | Alt percent min | Ti max |
SC2 | 0.06 | 0.35 | 0.025 | 0.025 | 0.015 | 0.20 |
It necessarily appear cold rolled coil steel is the interlayer inside the substrate. This defect does not necessarily appear on the surface, and it often appears as single-sided or double-sided bubbling.
The bubbles are not welded or poorly welded during hot rolling.
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