The shape defect of the steel coil is higher (or lower) than the one end of the operation cold rolled steel coil, and is continuous, like a pagoda, which appears in the inner (outer) ring portion of the operation cold rolled steel coil.
Coiling machine centering device failure, strip steel deviation; operation cold rolled steel coil is not straight, such as sickle bending, narrowing, etc.; The shape of the plate is bad, and a large side wave appears, so that the steel strip exceeds the photoelectric tube control limit;
The operation is improperly adjusted, the shrinkage of the reel is small, and when the pusher rolls out the steel coil, the inner ring is pulled out.
A corrugated mark that is at an angle to the rolling direction and is symmetric with respect to the center line of the width of the operation cold rolled steel coil. The edge of the steel strip has a discontinuous small-scale side wave shape. The edge of the operation cold rolled steel coil has a continuous wave shape.
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Al(%) | Ti(%) |
| Max 0.01 | Max 0.03 | Max 0.03 | 0.02 | 0.02 | — | Max 0.20 |
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