| 摘要 |
PROBLEM TO BE SOLVED: To stably manufacture a good quality cold-rolled steel sheet by preventing a poor concave-convex shape from being produced at a short pitch in a sheet width direction as a flatness error after cold rolling.SOLUTION: In the manufacturing of a cold-rolled steel sheet 10 of a predetermined dimension by cold rolling a hot-rolled steel sheet after subjected to pickling, a roll cooling device 30 in which cooling spray nozzles 32 are arrayed in a plurality of rows in a body length direction of a workpiece roll (20) is made movable in the body length direction of the workpiece roll, and the steel sheet is cold rolled while the roll cooling device is periodically moved in the body length direction of the workpiece roll. |
