409/409L Stainless Steel Sheet

409/409L Stainless Steel Sheet is a general purpose, chromium, titanium stabilized, ferritic stainless steel whose primary application is automotive exhaust systems. It contains 11% chromium which is the minimum amount for the formation of the passive surface film which gives stainless steels their corrosion resistance. 409/409L Stainless Steel Sheet combines good elevated temperature corrosion resistance with medium strength, good formability, and overall cost. 409/409L Stainless Steel Sheet resists corrosion strongly compared to carbon steel and is used as an alternative to carbon steel in mildly challenging environments where its high resistance to corrosion and high temperature oxidation gives an advantage. It is commonly used in applications where appearance is a secondary quality to mechanical properties and corrosion resistance.

★Resists atmospheric and exhaust gas corrosion

★In most atmospheres a light surface rust will form which inhibits further corrosion but makes the surface less appealing

Heat Resistance:

★Generally classified as resistant to scaling in intermittent service up to 1499oF (815oC ) and up to 1247oF (675oC) in continuous service

★Readily weldable

★Pre-heat of 302 to 500oF (150 to 260oC) is recommended

★Post-weld annealing at 1400 to 1499oF improved weld ductility

★Post-weld annealing is not required when welding thin sections

★Automotive exhaust tubing is typically welded without filler metal