Clad pipe

Details Clad pipe Clad pipe

2007-01-30

2007-01-30

Lavilla, Michael E. (Department: 1775)

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

C428S034100, C428S667000, C428S681000, C428S615000, C166S242400

Reexamination Certificate

active

11046828

ABSTRACT:
A clad pipe includes an external layer and a coating layer made of Ni base anticorrosion alloy. Both end portion areas of the coating layer are formed by a build-up welded layer (Ni base alloy of composition1) on the inner surface of the external layer. Other areas are formed by a Ni base alloy layer (Ni base alloy of composition2) fusion-bonded to the build-up welded layers and the inner surface of the pipe, a solidus-curve temperature of the Ni base alloy layer being 1300° C. or below and lower than a solidus-curve temperature of the Ni base alloy formed by build-up welding by 150° C. or more. Composition1and composition2are adjusted so that, in the same environment, corrosion resistance of the Ni base alloy of composition1is equivalent to or superior to that of the Ni base alloy of composition2.

REFERENCES:
patent: 4754911 (1988-07-01), Turner
patent: 06-142948 (1994-05-01), None
The Japan Research and Development Center for Metals Report, Demonstration Technique in Actual Field under Corrosive Environment, Aug. 1, 2000.

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