Ferritic SS 405
The 400 series in the ferritic stainless-steel group have about 11-12% Cr and 1% Mn. The grain structure of ferritic stainless steel is BCC (body centred cubic) in comparison to austenitic stainless steel which has its grain structure as FCC (face centred cubic), the alpha iron in ferritic stainless steel is what gives it its magnetic properties.
The 11-12% Cr in the ferritic SS 405 makes the metal corrosion resistant. Though it has lesser resistance than other alloys in the series but it possesses excellent dimensional stability, suitable welding properties, appropriate pitting resistance and comes at a low cost. The alloy is principally used in the lining of pressure vessels. It has carbon content of maximum 0.08%, which prevents it from getting brittle at allowable temperatures.