CENTRIFUGALLY CAST COMPOSITE ROLL AND ITS PRODUCTION METHOD

摘要

A centrifugal casting composite roll in which an outer layer formed by a centrifugal casting method and an inner layer made of a ductile cast iron are integrally bonded to each other, wherein the outer layer contains at least 0.8% to 3.0% of Cr, Based alloy having a chemical composition containing Mo: 1.5% to 6.0% and V: 1.8% to 5.5% and a graphite area ratio of 0.3% to 10% in the metal structure, And the total amount of Cr, Mo, and V at both ends of both shaft portions is 0.15 mass% to 2.0 mass%, and the total amount of Cr, And the difference in the total amount of Cr, Mo and V between the one shaft portion and the other shaft portion is 0.2 mass% or more.