[s-cars] How much rust should one expect to appear on a stainless steel exhaust?

[Michael Bess]

Hopefully some last words on this topic....

 

I did the magnet check on both my old stock system and the Stromung.  Here
are the magnetic findings:

                           Stock             Stromung   

Downpipe             Non-mag        Mag

Wastegate pipe    Non-mag        Non-mag

Connecting pipe   Non-mag         N/A

Cats                    Mag               Mag

Connecting pipe   Mag               Mag

Resonator           Mag                Mag

Connecting pipe  Mag                Mag

Muffler & tip        Non-mag         Non-mag

 

The interesting finding is that Stromung uses different materials for the
main downpipe from the turbo and the wastegate downpipe.  Based upon the
heat tint already noted, the wastegate pipe is a Nickel containing alloy
(304)

 

So both Audi and Stromung are using different materials for different
purposes in their exhaust systems.  BTW, not all “stainless steels” are
non-magnetic.  Only those alloys which are austenitic (i.e., contain higher
% of Nickel like 304) are non-magnetic.  The Chromium-only stainless steels
(409 and 439) are ferritic and therefore magnetic.  

 

METALS MARKETING & TECHNOLOGY

 

Michael Bess

President

 


No virus found in this outgoing message.
Checked by AVG Free Edition. 
Version: 7.5.472 / Virus Database: 269.8.6/828 - Release Date: 6/1/2007
11:22 AM