COMPOUND ROLL FOR THIN COLD ROLLED STEEL STRIP AND METHOD OF MANUFACTURING SAME

摘要

A compound roll for thin cold rolled steel strip, capable of rolling a cold rolled steel strip having a small edge drop, a cold rolled stainless steel strip and a bright finished steel strip, which have an exceedingly favorable surface gloss, or a silicon steel strip having an excellent magnetic characteristics without incurring breakage of the roll, said roll having a sleeve fitted onto a periphery of a shaft material section with the shaft material section being the central axis thereof, and a method of manufacturing such roll. The sleeve comprises an integrally formed member or a member obtained by integrating a plurality of formed members which are divided at a plane intersecting the central axis of the roll. Further, the fitted roll is formed, at the outermost layer, of sleeve material of a WC-Co based cemented carbide having a Young's modulus of at least 35000 kgf/mm<2> (350 GPa) and a Co content of 12 to 50 wt.%, the outermost layer sleeve material having a thickness of at least 3 % of a roll radius and a ratio L/D of a sleeve barrel length L to a roll diameter D being in the range of 2 to 10. Also, in the case where one or more intermediate layers are provided between the outermost layer sleeve and a shaft core, outer layers have a greater Young's modulus than those of inner layers.