Stainless steel member and method of manufacturing stainless steel member
AssigneeKabushiki Kaisha Toshiba
InventorsHiroshi Tateishi, Kiyoshi Imai, Hideyuki Ohzu, Kazuaki Nakagawa, Yoshihiro Akasaka
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Abstract
Disclosed is a stainless steel member with a high corrosion resistance suitable for a structural member used in highly corrosive environments, such as an edge seal plate of a molten carbonate fuel cell. This stainless steel member includes a base material consisting of stainless steel containing chromium, and a corrosion-protective layer formed on the surface of the base material. In this corrosion-protective layer, a granular heterophase containing chromium is precipitated in an ordered alloy consisting of aluminum and the constituent elements of the base material.
Claims18
A stainless steel member comprising:
- a base material consisting of stainless steel containing chromium;
- and
- a corrosion-protective layer in which a granular heterophase containing chromium is precipitated in an ordered alloy consisting of aluminum and constituent elements of said base material, said corrosion-protective layer being formed on the surface of said base material.
A method for manufacturing a stainless steel member, comprising the steps of:
- forming an aluminum layer on the surface of a base material consisting of stainless steel;
- and
- performing a heat treatment in a non-oxidizing atmosphere at a temperature of 670.degree. to 840.degree. C., thereby forming, on the surface of said base material, a corrosion-protective layer in which a granular heterophase containing chromium is precipitated in an ordered alloy consisting of aluminum and constituent elements of said base material.
Dependencies are inferred from the claim text.