| abstract |
The invention discloses a ferritic stainless steel used for a fuel cell bipolar plate, a method for regulating and controlling surface roughness, a method for forming a passivation film, and an application thereof. The ferritic stainless steel includes C 0.03wt.% or less, N 0.02wt.% or less, Si 0.4wt.% or less, Mn 0.5wt.% or less, Cr 16-23wt.%, Cu 0-2.0wt.%, Mo 1.8～2.5wt.%, Ni 0.2～2.0wt.%, Ti 0.1～0.5wt.%, Nb 0.005～0.5wt.%, P 0.02wt.% or less, S 0.02wt.% or less, the balance is Fe and other elements that cannot be avoided, the grain size of the ferritic stainless steel is 4-9. It has good corrosion resistance, electrical conductivity, and good elongation and deformation ability, and has both economic and cost advantages. |