US 11,809,140 B2
Housing and device
Koki Takasawa, Suwa (JP)
Assigned to SEIKO EPSON CORPORATION
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Dec. 11, 2020, as Appl. No. 17/118,808.
Claims priority of application No. 2019-225201 (JP), filed on Dec. 13, 2019.
Prior Publication US 2021/0181685 A1, Jun. 17, 2021
Int. Cl. C23C 8/00 (2006.01); G04B 37/22 (2006.01); C23C 28/00 (2006.01); C23C 8/26 (2006.01); C21D 6/00 (2006.01); C21D 9/00 (2006.01)
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
OG exemplary drawing
 
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.