Loading patent…
AssigneeJfe Steel Corporation
InventorsNoriko Makiishi, Hisato Noro, Shin Ishikawa, Shinsuke Ide, Tomohiro Ishii, Masayasu Nagoshi
Estimating the term…
Stainless steel for fuel cell separators are provided which exhibit stable contact resistance characteristics and excellent practical utility. The stainless steel contains not less than 16 mass % of Cr. When the surface configuration of the stainless steel is analyzed with a scanning electron microscope at a spatial resolution of not more than 0.1 μm, the surface modulus is not less than 1.02. Preferably, the chemical composition further includes C: not more than 0.03%, Si: not more than 1.0%, Mn: not more than 1.0%, S: not more than 0.01%, P: not more than 0.05%, Al: not more than 0.20%, N: not more than 0.03%, Cr: 16 to 40%, and one or more of Ni: not more than 20%, Cu: not more than 0.6% and Mo: not more than 2.5%, the balance being Fe and inevitable impurities.
A stainless steel for fuel cell separators, wherein the stainless steel contains not less than 16 mass % of Cr and has a surface modulus of not less than 1.02, the surface modulus being obtained by a measurement of surface configuration with respect to the surface of the stainless steel with a scanning electron microscope at a spatial resolution of not more than 0.1 μm.
Dependencies are inferred from the claim text.