Dai-ichi High Frequency Co., Ltd.

Akihiro Takeya

Yoichi Matsubara

Seiichiro Miyata

Yoshinobu Sochi

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 composition) on the inner surface of the external layer. Other areas are formed by a Ni base alloy layer (Ni base alloy of composition) 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&#xb0; C. or below and lower than a solidus-curve temperature of the Ni base alloy formed by build-up welding by 150&#xb0; C. or more. Compositionand compositionare adjusted so that, in the same environment, corrosion resistance of the Ni base alloy of compositionis equivalent to or superior to that of the Ni base alloy of composition

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Kawasaki, Japan

Akihiro Takeya