Stainless steel having good conductivity and ductility for use in fuel cell and method for producing the same
US8440029B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2010 |
| Grant date | May 14, 2013 |
| Priority date | — |
| Expiry date | Jul 26, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A stainless steel having good conductivity and ductility for use in a fuel cell separator is provided. In particular, the stainless steel has a composition of, in terms of % by mass, C: 0.01% or less, Si: 1.0% or less, Mn: 1.0% or less, S: 0.01% or less, P: 0.05% or less, Al: 0.20% or less, N: 0.02% or less, Cr: 20 to 40%, Mo: 4.0% or less, and at least one selected from Nb, Ti, and Zr: 0.05 to 0.60% in total, the balance being Fe and unavoidable impurities. At least one precipitate having an equivalent circle diameter of 0.1 μm or more is present per 100 μm2, a ratio of a thickness t (μm) to a maximum diameter Dmax (μm) of the precipitates satisfies formula (1) below20≦t/Dmax (1)and the thickness is 200 μm or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.