US 12,454,746 B2
Ferritic stainless steel for solid oxide fuel cell
Muhammad Febry, Tokyo (JP); Tetsuyuki Nakamura, Tokyo (JP); Takayoshi Yano, Tokyo (JP); Masataka Yoshino, Tokyo (JP); and Reiko Sugihara, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/904,954
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Feb. 19, 2021, PCT No. PCT/JP2021/006477
§ 371(c)(1), (2) Date Aug. 25, 2022,
PCT Pub. No. WO2021/177063, PCT Pub. Date Sep. 10, 2021.
Claims priority of application No. 2020-035204 (JP), filed on Mar. 2, 2020.
Prior Publication US 2023/0119504 A1, Apr. 20, 2023
Int. Cl. C22C 38/54 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/52 (2006.01)
CPC C22C 38/54 (2013.01) [C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A ferritic stainless steel for solid oxide fuel cells having improved oxidation resistance, chromium poisoning resistance, and electrical conductivity, comprising a chemical composition consisting of, in mass %,
C: 0.025% or less,
Si: 0.05% to 1.00%,
Mn: 0.05% to 1.00%,
P: 0.050% or less,
S: 0.010% or less,
Cr: 14.0% to 32.0%,
Al: 0.55% to 2.00%,
Ni: 0.01% to 1.00%,
Nb: 0.15% to 1.00%,
Mo: 2.10% to 3.00%,
Mg: 0.0005% to 0.0100%, and
N: 0.025% or less,
optionally, at least one selected from the group consisting of
Co: 0.01% to 1.00%,
W: 0.01% to 3.00%,
Ti: 0.01% to 0.50%,
V: 0.01% to 0.50%,
Zr: 0.01% to 0.50%,
B: 0.0002% to 0.0050%,
Ca: 0.0002% to 0.0050%, and
REM: 0.01% to 0.20%,
with the balance being Fe and inevitable impurities, wherein
a relationship of 0.0004≤[Mg]/[Al]≤0.0050 is satisfied,
where [Al] and [Mg] are the Al content in mass % and the Mg content in mass % in the chemical composition, respectively.