US 11,669,048 B2
Watch component and watch
Koki Takasawa, Suwa (JP)
Assigned to SEIKO EPSON CORPORATION
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Sep. 4, 2020, as Appl. No. 17/12,120.
Claims priority of application No. JP2019-162004 (JP), filed on Sep. 5, 2019.
Prior Publication US 2021/0072702 A1, Mar. 11, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G04B 37/22 (2006.01); C22C 38/48 (2006.01); C22C 38/44 (2006.01); C22C 38/42 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/40 (2006.01); C21D 1/06 (2006.01)
CPC G04B 37/22 (2013.01) [C21D 1/06 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C21D 2211/001 (2013.01); Y10T 428/12958 (2015.01)] 4 Claims
OG exemplary drawing
 
1. A metal material comprising a base material, the base material being a ferritic stainless steel that contains, by mass %, 18 to 22% of Cr, 1.55 to 2.8% of Mo, 0.30 to 0.50% of Nb, 0.1 to 0.8% of Cu, less than 0.5% of Ni, less than 0.8% of Mn, less than 0.5% Si, less than 0.10% of P, less than 0.05% of S, less than 0.05% of N, and less than 0.05% of C, with a remainder thereof being composed of Fe and unavoidable impurities,
wherein the base material is treated with a nitrogen absorption treatment.