Nov 10, 2015 · The most frequently used stainless steel in performance exhaust systems is T409. Usually found in Flowmaster, Invidia, and many other aftermarket stainless mufflers and catbacks, this mixture does not contain enough chromium to resist corrosion in cold-weather states, or areas where salted roads aid in corrosion development.

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Feb 5, 2009 · T409 stainless is the next grade of stainless available, and is probably the best known and most popular, also known as ferritic stainless. T409 is a low-carbon steel that is at least 12 percent chromium.

Alloy 409 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.

Straub Metal, founded in 1970, is a global distributor of Type 409 Stainless Steel. We maintain an extensive inventory of stainless steel alloy grades, including T409, 409 AL, T439, T441, and 18CrCb. Our T409 and T439 stainless steel are available in various forms, including sheets, coils, strip coils, panels, plates, and washers.

Jul 9, 2006 · -- 409 will age and look like a factory exhaust system over time and possilby rust or corrode under certain criteria. -- as Gale said ... 409 has a higher carbon content so it more like regular steel tubing than stainless. It can be welded by a muffler shop without special equipment. On a personal note ....

Kenworth’s T409 has been developed as a flexible and aerodynamic solution for maximum-length on highway operations, ideal for general freight or tanker operations. The T409 gives you the power of choice, with the option of a PACCAR MX-13 engine up to 510 hp and 1850 lb-ft or a Cummins X15 Euro 5 engine up to 550 hp and 1850 lb-ft.