The Japan Steel Works, Ltd.

Mitsubishi Chemical Corporation

Furuya Metal Co., Ltd.

Tokyo Denpa Co., Ltd.

Tsuguo Fukuda

Shinya Sato

Rinzo Kayano

Tatsuya Takahashi

Yoshihiko Yamamura

Koichi Takasawa

Shinichi Nishiya

Masahiro Sakuraba

Yukio Nitta

The present invention relates to an Fe&#x2014;Ni-based alloy having excellent high-temperature characteristics and hydrogen embrittlement resistance, which has a composition containing, in terms of % by mass, C: 0.005% to 0.10%, Si: 0.01% to 0.10%, P: 0.015% or less, S: 0.003% or less, Ni: 23.0% to 27.0%, Cr: 12.0% to 16.0%, Mo: 0.01% or less, Nb: 0.01% or less, W: 2.5% to 6.0%, Al: 1.5% to 2.5%, and Ti: 1.5% to 2.5%, the balance being Fe and other unavoidable impurities.

Fe-Ni-based alloy having excellent high-temperature characteristics and hydrogen embrittlement resistance characteristics, and method for producing the same

A material is presented that exhibits excellent corrosion resistance to supercritical ammonia and is suitable for a supercritical ammonia reactor. An Ni-based corrosion resistant alloy includes from 15% or more to 50% or less by mass of Cr and any one or both of Mo and W, wherein a [(content of Mo)+0.5&#xd7;(content of W)] is from 1.5% or more to 8.5% or less by mass, a value of 1.8&#xd7;[% content of Cr]/{[% content of Mo]+0.5&#xd7;[% content of W]} is from 3.0 or more to 70.0 or less and the balance is Ni and an unavoidable impurity. The alloy may be used to configure a supercritical ammonia reactor or the material is coated on a surface that contacts with a supercritical ammonia fluid. The alloy exhibits excellent corrosion resistance to supercritical ammonia and a mineralizer added the supercritical ammonia. The safety and reliability of an apparatus can be improved, the producing cost can be reduced, the apparatus lifetime can be extended and the running cost can be reduced.

Ni-based corrosion resistant alloy and corrosion resistant member for supercritical ammonia reactor made of the alloy

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Muroran, Japan

Shinya Sato