Patent ID: 10786974

Abstract:
The present invention provide a ferritic stainless steel foil having a high thickness precision even with a thickness 60 μm or less ultrathin stainless steel foil and simultaneously having a plastic deformation ability and good elongation at break, that is, having a good press-formability (deep drawing ability).The present invention is a stainless steel foil having a thickness of 5 μm to 60 μm, wherein a recrystallization ratio of said stainless steel foil is 90% to 100%, a surface layer of said stainless steel foil has a nitrogen concentration of 1.0 mass % or less, three or more crystal grains are contained in the thickness direction of said stainless steel foil, an average crystal grain diameter “d” of said crystal grains is 1 μm to 10 μm, and, when said thickness is “t” (μm), an area ratio of crystal grains having a crystal grain diameter of t/3 (μm) or more is 20% or less.