Stainless steel for fuel cell separator
AssigneePosco
InventorsKwangmin Kim, Yongho Kim, Bo-sung Seo, Dong-hoon Kim
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Abstract
Disclosed is a stainless steel for a fuel cell separator, more specifically, a stainless steel for a fuel cell separator having a low contact resistance. According to an embodiment of the stainless steel for a fuel cell separator disclosed herein, an arithmetic mean summit curvature Ssc of the surface defined according to the ISO 25178 standard is at least 6.0 μm−1, a root mean square surface slope Sdq is at least 23, and a contact resistance is at most 10 mΩ·cm2.
Claims6
A stainless steel for a fuel cell separator, wherein the stainless steel is a ferritic stainless steel comprising, in percent by weight (wt %), at most 0.02% of C, at most 0.02% of N, 15 to 35% of Cr, at most 0.03% of C+N, and the balance of Fe and other inevitable impurities, and
- wherein an arithmetic mean summit curvature (Ssc) of a surface defined according to the ISO 25178 standard is at least 6.0 μm−1, a root mean square surface slope (Sdq) is at least 23, and a contact resistance is at most 10 mΩ·cm2.
A stainless steel for a fuel cell separator, wherein the stainless steel is an austenitic stainless steel comprising, in percent by weight (wt %), at most 0.09% of C, 15 to 30% of Cr, 7 to 15% of Ni, and the balance of Fe and other inevitable impurities, and
- wherein an arithmetic mean summit curvature (Ssc) of a surface defined according to the ISO 25178 standard is at least 6.0 μm−1, a root mean square surface slope (Sdq) is at least 23, and a contact resistance is at most 10 mΩ·cm2.
Dependencies are inferred from the claim text.