Levelling is a crucial subsequent process in cold-rolled coil production, primarily serving to: correct sheet form by eliminating defects such as waves and warping arising from cold rolling and annealing; adjust surface finish by controlling the roughness of levelling rolls to achieve the desired surface texture; partially relieving internal stresses to enhance dimensional stability; slightly increasing material strength and hardness (via minor cold-rolling deformation); and providing optimal surface conditions for subsequent processing (e.g., coating, stamping). The elongation rate during levelling is typically controlled between 0.5% and 3%, with specific parameters adjusted according to product requirements and material properties.
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