Development and application of the asymmetry work roll for hot strip mills

Both shape control and uniform roll wear for schedule-free rolling should be realized in the downstream stands of the finishing trains of hot rolling, and the edge drop of some special steel grades such as silicon steel and container steel is large. It is much difficult to get the target crown by conventional shape control means. The asymmetry work roll with a special curve at one roll body end was developed. The top work roll and bottom work roll are placed anti-symmetrically. As the roll axial position is changed, the variation in strip crown is over 150μm. In order to control the strip edge profile efficaciously, a relevant shifting strategy of this roll was designed. At the same time, the wear contour of the work roll can be improved and it is helpful for schedule-free rolling. The application of the asymmetry work roll in the 1700ASP product line of Ansteel shows the crown of silicon steel is reduced by 29.8 96 and the crown of high strength steel can be controlled below 50 μm stably.