Development of Cold Rolling Technology for High Thickness Accuracy and Excellent Tensile Property Sheet

Abstract

In order to meet customer's growing demand for thickness accuracy of cold rolled strip, it becomes more important to minimize the thickness deviation in the transverse direction as well as in the longitudinal direction. Through our research work, it was revealed that strip edge profile can be controlled by changing a roll crown and the control range is large when a reduction in thickness is large. A Pair Cross (PC) mill has been introduced in stands 1-3 of the new 5-stand tandem cold strip mill at Kashima Steel Works of Sumitomo Metal Industries, Ltd. Using the PC rolling technology and a newly developed automatic gage control (AGC) system, a production system for a high thickness-uniformity sheet has been developed.
Excellent tensile property sheet is also required recently by automobile companies. By rolling ultra-low carbon steel with high reduction excellent tensile property has been obtained.