Which is the best stainless steel for a muffler, 304 or 409? Flowmaster
offers both on their Hushpower II series with a $30 price difference.

Doc Custer
Retired Software Engineer and sometime Audiologist


304 is Austenitic better corrosion resistance higher temp
and 409 is Ferritic lower cost.

"The presence of chromium greatly improves the corrosion resistance of the
[Austenitic] steel by forming a very thin stable oxide film on the surface,
so that chromium-nickel stainless steels are now the most widely
used materials in a wide range of corrosive environments both
at room and elevated temperatures.

Added to this, austenitic steels are readily fabricated and do not
undergo a ductile/brittle transition which causes so many problems
in ferritic steels. This has ensured that they have become a most
important group of construction steels, often in very demanding environments."

http://www.key-to-steel.com/Articles/Art104.htm

Paul Lamar ...No rotor no motor.

Doc,
304 is a commercial standard and readily available, however I think the 321
is the preferred exhaust SS. I just don't remember the reasons.
George ( down under)

You won't get and off the shelf cheap muffler in 321.


Paul Lamar ...No rotor no motor.

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