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AssigneeHitachi, Ltd.
InventorsYoshihisa Kiyotoki, Mitsuo Chigasaki, Shizuo Matsushita, Jiro Kuniya, Takahiko Kato, Yoshiteru Chiba
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In the joint construction of cobalt-based alloy, a cobalt-based alloy layer 1, in which granular or massive eutectic carbide 2 disperses, is joined to a metal of a base metal 37 via an insert metal layer 36. For the joint construction of cobalt-based alloy, liquid phase diffusion bonding is performed at a temperature of 1100° C. for a retention time of 1 hour with an insert metal with a thickness of about 40 μm being interposed between the base metal, which is S45C carbon steel, and a cobalt-based alloy material which has granular or massive eutectic carbide with a grain size not larger than 30 μm in a matrix of cast structure and contains 1.03 wt % C, 29.73 wt % Cr, 3.86 wt % W, 2.59 wt % Ni, 2.67 wt % Fe, 0.59 wt % Si, and 0.07 wt % Mo, the balance substantially being Co. The cobalt-based alloy layer 1 after bonding contains granular or massive eutectic carbide.
A joint construction of cobalt-based alloy in which a cobalt-based alloy material portion is diffusion bonded to a base metal portion by interposing an insert metal between said cobalt-based alloy portion, in which granular or massive eutectic carbide disperses in a matrix of metal microstructure, and said base metal portion, wherein
A valve comprising a valve casing and a valve element disposed in said valve casing, said valve casing having a valve seat which comes into contact with said valve element, wherein
A valve comprising a valve casing and a valve element disposed in said valve casing, said valve casing and said valve element each having a valve seat which comes into contact with each other, wherein
A nuclear reactor plant comprising a reactor incorporating a reactor core, a system in which a coolant in said reactor flows, and a valve provided in a pipe of said system, wherein
A nuclear reactor plant comprising a reactor incorporating a reactor core, a system in which a coolant in said reactor flows, and a valve provided in a pipe of said system, wherein
Dependencies are inferred from the claim text.