1992 Volume 32 Issue 11 Pages 1244-1249
Recently work rolls for cold rolling mill have been required for higher toughness because of remarkable progress in rolling mill, in addition, demands for higher wear resistance of rolls and lower damage of rolls in the accident of rolling have been increasing more and more. The new composite roll by the rotational electroslag remelting (ESR) bimetallic method was developed in order to satisfy such various demands at the same time.
The rotational ESR bimetallic method is a producing method of composite ingots, in which a pipe shaped electrode is electroslag remelted in a gap between a mold and a core rotating synchronously and forms an outer layer around a core. By this bimetallic method, it is possible to manufacture a composite ingot with highly concentric boundary and outer layer of extremely uniform thickness. Because the boundary is sound and strong enough to endure at severe heat treatment and hard rolling condition, in addition, various materials such as high speed steel or high chromium iron can be applied to the outer layer with sound boundary, it becomes possible to improve remarkably roll properties. This new composite rolls with the outer layer of high speed steel obtained three to five times higher wear resistance than conventional rolls in commercial cold rolling, and the damage in the accident of rolling could be decreased remarkably.
