Hiroshi Utsunomiya

The spread rolling of IF steel strip

Abstract A rolling method to increase the width of materials would have advantages in multi-width strip production, giving high yield efficiency and productivity. Textures of strips also could be controlled by the method. It is, however, still difficult to produce transverse metal flow in thin strips. It is due to the high width/thickness aspect ratio. The authors suggested a new method for spread rolling of thin strips. In this study, the method has been applied to interstitial atom free (IF) steel strip, which is a particular material utilized for deep drawing process and requires small planar anisotropy. The thin strip with 1xa0mm thick and 70xa0mm wide is widened up to 72xa0mm by a reduction of 35% in thickness for the spread rolling. The flat rolling with the same reduction of 35% is also performed for comparison. Both the spread-rolled and flat-rolled strips are subsequently annealed. As for the textures of the as-rolled strips, the evolution of 〈1xa01xa01〉//ND fiber is so remarkable in the spread strips as that in the flat-rolled strips. It is found that the planar anisotropy of r -values in the spread-rolled strips is smaller than that in the flat-rolled strip.