Rolling steel take-up tension is too large or the tension is fluctuating, the shape of the plate is not good, causing bulging, and bonding occurs at a large pressure between layers;
Strip steel surface roughness is too small.
Steel is too soft, less carbon and silicon content.
The heat treatment furnace temperature is too high or the annealing cooling rate is too fast; the steel coil is collided and injured before loading the furnace.
Cold-rolled strip mills can be divided into two categories: single-machine reversible or irreversible and multi-machine continuous.
Cover furnace annealing process, high temperature furnace (roller temperature is greater than 110 ° C), resulting in steel coil oxidation.
| Manufacturer | Thickness | Width | Length of plate |
| 0.3-2.5mm | 1000-1500mm | 1000-6000mmDC01/ ST12 | |
| Private factories | 0.14-0.9mm | 50/610/762/914mm |
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