High-quality work roll manufacturing technology using new ESR

As work rolls for cold rolling (hereinafter referred to as rolls) have a stringent requirement for a high degree of surface and internal quality, the rolls are generally made from ESR (Electro Slag Remelting) ingots, which assures stable quality. In order to produce rolls with good dendrite pattern, a fine and uniform dendrite structure with no flow pattern is necessary. Segregation lines called freckle are sometimes generated in the ingots. Freckle should not be generated within the range of use of the rolls. In recent years, the equipment was upgraded, and a great improvement was seen in surface quality and internal quality.