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US 10,763,517 B2Granted
Stainless steel sheet for fuel cell separators, and production method therefor
AssigneeJfe Steel Corporation
InventorsTakayoshi Yano, Shin Ishikawa
Life of this patent
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Abstract
A stainless steel sheet for fuel cell separators comprises: a predetermined chemical composition; and fine precipitates containing Cr and Ti at a steel sheet surface, wherein an average equivalent circular diameter of the fine precipitates is 20 nm or more and 500 nm or less, and a number of the fine precipitates existing per 1 μm2 at the steel sheet surface is three or more.
Claims16
A stainless steel sheet for fuel cell separators, comprising:
- a chemical composition containing, in mass %,
- C:
- 0.003% to 0.030%,
- Si:
- 0.01% to 1.00%,
- Mn:
- 0.01% to 1.00%,
- P:
- 0.050% or less,
- S:
- 0.030% or less,
- Cr:
- 16.0% to 32.0%,
- Ni:
- 0.01% to 1.00%,
- Ti:
- 0.05% to 0.45%,
- Al:
- 0.001% to 0.200%, and
- N:
- 0.030% or less,
- with the balance being Fe and inevitable impurities;
- and
- fine precipitates containing Cr and Ti at a steel sheet surface,
- wherein an average equivalent circular diameter of the fine precipitates is 20 nm or more and 500 nm or less, and a number of the fine precipitates existing per 1 μm2 at the steel sheet surface is three or more.
22 more elements
Dependencies are inferred from the claim text.