Centrifugally cast composite roller and method for manufacturing same

Abstract

A centrifugally cast composite roller in which an outer layer formed by centrifugal casting and an inner layer made from ductile cast iron are integrally welded, wherein: the outer layer has a chemical composition containing at least 0.8 to 3.0% of Cr, 1.5 to 6.0% of Mo, and 1.8 to 5.5% of V, by mass, and comprises an Fe-based alloy in which the graphite area ratio in the metal structure is 0.3 to 10%; the inner layer has a body core part welded to the outer layer, and shaft parts extending integrally from both ends of the body core part, the total amount of Cr, Mo, and V at end sections of both shaft parts being 0.15 to 2.0 mass%, and the difference in the total amount of Cr, Mo, and V between one shaft part and the other shaft part being equal to or greater than 0.2 mass%.

Description

technical field

[0001] The present invention relates to a centrifugal casting composite roll having a composite structure in which an outer layer formed by a centrifugal casting method and a tough inner layer are welded and integrated, and a manufacturing method thereof. Background technique

[0002] Such as figure 1 with figure 2 As shown, the composite roll 10 for hot rolling is composed of an outer layer 1 in contact with a rolled material, and an inner layer 2 welded to the inner surface of the outer layer 1 and having a different material from the outer layer 1 . The inner layer 2 is composed of a core portion 21 welded to the outer layer 1 , and a driving side shaft portion 22 and a driven side shaft portion 23 integrally extending from the core portion 21 to both sides. At an end portion of the driving side shaft portion 22, a coupling portion 24 for driving torque transmission is integrally provided. In addition, at the end of the driven side shaft portion 23, a ...

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