Stainless steel for fuel cell separators
AssigneeJfe Steel Corporation
InventorsMasayasu Nagoshi, Shinsuke Ide, Shin Ishikawa, Noriko Makiishi
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Abstract
A stainless steel having a low surface contact resistance for fuel cell separators is provided. The stainless steel has a Cr content of 16 to 40 mass % or more. The stainless steel includes a region having a fine textured structure on its surface, and the area percentage of the region is 50% or more, preferably 80% or more. The region having a fine textured structure is a region which has a structure having depressed portions and raised portions at an average interval between depressed portions or raised portions of 20 nm or more and 150 nm or less when observed with a scanning electron microscope.
Claims11
A stainless steel having a low surface contact resistance for fuel cell separators and a Cr content in the range of 16 to 40 mass %, wherein
- the stainless steel includes a region having a fine textured structure on its surface, the area percentage of the region being 50% or more, and
- the region having a fine textured structure is a region which has a structure having depressed portions and raised portions at an average interval between the depressed portions or the raised portions of 20 nm or more and 150 nm or less when observed with a scanning electron microscope, the raised portions having a triangular pyramidal top having an average angle of 80 degrees or more and 100 degrees or less.
Dependencies are inferred from the claim text.