IP Library › Granted Patent US 12,454,746
Granted Patent B2
US 12,454,746 · App. 17/904,954 · Granted Oct 28, 2025

Ferritic stainless steel for solid oxide fuel cell

Inventors: Muhammad Febry (Tokyo, JP); Tetsuyuki Nakamura (Tokyo, JP); Takayoshi Yano (Tokyo, JP); Masataka Yoshino (Tokyo, JP); Reiko Sugihara (Tokyo, JP)
Assignee: JFE STEEL CORPORATION
C22C38/54C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52
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Quick Facts
Patent No.
US 12,454,746
App. No.
17/904,954
Granted
Oct 28, 2025
Kind
B2
Abstract

Having a chemical composition (1) containing 0.15 mass % to 1.00 mass % of Nb, and (2) containing 0.0005 mass % to 0.0100 mass % of Mg, where (3) the Al content is controlled in a range of 0.55 mass % to 2.00 mass %, and (4) a relationship of 0.0004≤[Mg]/[Al]≤0.0050 is further satisfied.

Claims (26)

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.

2 . The ferritic stainless steel for solid oxide fuel cells according to claim 1 , wherein the relationship of 0.0004≤[Mg]/[Al]≤0.0030 is satisfied.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 25, 2022
From: FEBRY, MUHAMMAD; NAKAMURA, TETSUYUKI; YANO, TAKAYOSHI; YOSHINO, MASATAKA; SUGIHARA, REIKO
To: JFE STEEL CORPORATION
Reel/Frame 060893/0910 →
Priority Claims (1)
JP 2020-035204 · Mar 2, 2020 · national
Continuity (1)
Related Publication 20230119504A1 · Apr 20, 2023
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