Title:
STAINLESS STEEL HAVING EXCELLENT CONTACT RESISTANCE FOR PEMFC SEPARATOR AND METHOD OF MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/008737
Kind Code:
A1
Abstract:
The present invention relates to a stainless steel for a fuel cell separator and a method of manufacturing same and, specifically, to a stainless steel having low contact resistance as a material for a fuel cell separator, a definition and provision of surface roughness parameters that can represent the surface shape of the stainless steel, and a method of manufacturing the stainless steel. Specifically, the present invention relates to a stainless steel having excellent contact resistance for a fuel cell separator and a method of manufacturing same, the stainless steel comprising, in wt%, C: 0 (exclusive) to 0.02%, N: 0 (exclusive) to 0.02%, Si: 0 (exclusive) to 0.4%, Mn: 0 (exclusive) to 0.3%, P: 0 (exclusive) to 0.04%, S: 0 (exclusive) to 0.02%, Cr: 15 to 34%, Cu: 0 (exclusive) to 1%, Ni: 0 (exclusive) to 0.4% (exclusive), one or more of Ti and Nb with the composition ratio of elements included being 0 (exclusive) to 0.5%, and the balance being Fe and other unavoidable impurities, wherein at least one surface of the stainless steel has a three-dimensional arithmetic mean roughness (Sa) of 0.05㎛ or more and a developed interfacial area ratio (Sdr) of 5% or more.
Inventors:
KIM KWANGMIN (KR)
KIM JONGHEE (KR)
SEO BOSUNG (KR)
KIM JONGHEE (KR)
SEO BOSUNG (KR)
Application Number:
PCT/KR2022/008457
Publication Date:
February 02, 2023
Filing Date:
June 15, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
H01M8/021; C21D8/02; C22C38/00; C22C38/42; C22C38/48; C22C38/50; C23G1/08; C25F1/06
Foreign References:
| KR20100080379A | 2010-07-08 | |||
| KR20170035374A | 2017-03-31 | |||
| US20170062843A1 | 2017-03-02 | |||
| KR20190127968A | 2019-11-13 | |||
| KR20140039326A | 2014-04-01 | |||
| JP2002270196A | 2002-09-20 |
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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