6-High Type Rolling Mill for Cold Rolling

The rolled strip shape is one of important factors in determining the quality of rolled products. The improved strip shape increases not only productivity but also product quality. Thus, it was desired to develop a new type of mill which is capable of controlling the rolled strip shape even with changes in rolling conditions. The performance of a conventional 4-High mill is not satisfactory in these requirements. A new 6-High cold rolling mill (hereinafter HC-MILL) has been developed in order to solve these shape problems. The HC-MILL for steel rolling was put into a practical operation at Nippon Steel Corporation at Yahata Works (now, Nippon Steel & Sumitomo Metal Corporation) in 1974 and HC-MILLs are widely used in the world and they contribute to the achievement of the controllability of the rolled strip shape and quality through the superior strip flatness controllability.