Patent ID: 7169480

Claim:
A clad pipe, comprising: an external layer constituted by a carbon steel pipe or a low alloy steel pipe; and a Ni-based alloy coating layer, the coating layer coating an inner surface of the external layer, wherein each of both end portion areas of the coating layer is formed by a build-up welded layer of a first Ni-based alloy on the inner surface of the external layer, wherein an area of the coating layer other than the build-up welded layers is formed by a second Ni-based alloy layer fusion-bonded to the build-up welded layers and the inner surface of the pipe, a solidus-curve temperature of the second Ni-based alloy layer being 1300° C. or below and lower than a solidus-curve temperature of the first Ni-based alloy by 150° C. or more, and wherein the corrosion resistance against hydrogen sulfide of the first Ni-based alloy is equivalent to or superior to corrosion resistance against hydrogen sulfide of the second Ni-based alloy.