CPC G04B 37/22 (2013.01) [C21D 6/002 (2013.01); C21D 9/0068 (2013.01); C23C 8/00 (2013.01); C23C 8/26 (2013.01); C23C 28/34 (2013.01); C23C 28/36 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01)] | 6 Claims |
1. A housing formed of austenitized ferritic stainless steel comprising:
a base formed of a ferrite phase, a surfacing layer formed on the base and having an austenitized phase in which the ferrite phase is austenitized, and a mixed layer between the base and the surfacing layer where the ferrite phase and the austenitized phase are mixed;
wherein:
the base contains, in percent by mass, Cr: 18 to 22%, Mo: 1.3 to 2.8%, Nb: 0.50%, Cu: 0.1 to 0.8%, Ni: less than 0.5%, Mn: less than 0.8%, Si: less than 0.5%, P: less than 0.10%, S: less than 0.05%, N: less than 0.05%, and C: less than 0.05%, with a balance being formed of Fe and unavoidable impurities;
the surfacing layer contains 1.6% percent by mass of nitrogen;
the housing includes:
a first surface exposed to an external space of the housing; and
a second surface adjacent to the first surface with a corner portion interposed therebetween, and exposed to the external space; wherein
an angle of an internal angle formed by the first surface and the second surface at the corner portion is greater than 0° and less than 180°, and
a thickness of the surfacing layer at the corner portion is greater than both of a thickness of the surfacing layer at the first surface and a thickness of the surfacing layer at the second surface.
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