Roping property of SUS430 cold-rolled sheet

This study investigates the origin of the roping of SUS430 ferritic stainless cold-rolled sheet, paying attention to the heterogeneous factors in the hot-rolled sheet thickness, and the effects of the colony structure and the alpha' phase in hot-rolled sheet on the behavior of the roping during cold rolling. The origin of the roping was the mid-thickness with strong a-fiber texture. As ascertained by temper color method, the hot-rolled sheet with severe roping after cold rolling had large {001} and {111} colonies with different deformation properties, while that with slight roping had a small {001} colony. The behaviors of the roping and the texture during cold rolling depended on the hot rolling condition and cold rolling reduction. The improvement of the roping of SUS430 cold-rolled sheets is brought by the control of {001} colonies in hot-rolled sheet and the formation of the deformation zone around a' phase in high cold rolling reduction.