Abstract
The effect of the profile of the hot coil on the flatness and the profile of cold-rolled strip has been studied by means of samples from a tandem cold mill of Pohang Iron and Steel Co., South Korea. Using geometrical relationships between the factors, measured values of the flatness and the profile were evaluated and theoretical correlation between the steepness values and the change in crown ratios were confirmed experimentally. As for coil build-up, it was established that a very small trace of a high spot in the hot-coil profile gave rise to a wavy shape in the uncoiled strip. Although the crown ratio of the cold strip became larger than that of the hot strip as the measurement point approached the strip edge, the influence of the profile of the mother strip remained even to a point 15 mm from the edge. Based on the results, the height limit of a high spot for good flatness and hot-strip crown values for uniform thickness over the width of the cold-rolled strip have been discussed.
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