409 stainless steel is a ferrite stainless steel, usually used in automotive exhaust systems due to its excellent mechanical properties and high-temperature corrosion resistance. This type of stainless steel, although prone to rust, is rarely used for decorative purposes, but has excellent corrosion resistance to gaseous corrosion.
409L stainless steel is a titanium-stabilized ferrite stainless steel that also has excellent mechanical properties and high-temperature corrosion resistance. In addition, due to the addition of titanium, the weldability and corrosion protection capabilities of 409L have been improved.
