At No. 2 tandem cold rolling mill, consisting of four 6-high stand mills, in Mizusima Works of Kawasaki Steel, by applying a one-side tapered work roll shifting method (K-WRS) and by using suitable taper profile of the work rolls, edge drop control range in cold rolling has been expanded. Furthermore, a feed-forward edge drop control system, corresponding to the amount of crown of hot-rolled material, and a feed-back edge control system using an edge drop sensor, have been established in the tandem cold rolling mill. Consequently, thickness accuracy in transverse direction has bee achieved within 0.5 percent in a steady rolling state (at a middle part of a strip) and within 0.8 percent in a non-steady rolling state (at lead and tail ends of a strip) over the full length of the thin hard steel strip product.
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