Bill Freeman wrote:

 Paul,

 I would recommend 321 or 347 over 316 due to the formation of
 chromium carbides at temps between 850F and 1600F.  The 316 will
 WORK fine, but will be susceptable to severe corrosion when at room
 temp and exposed to humid air after sensitization , i.e. a time at
 the "no-no" temps.  301 thru 304, 316 and 310 all behave this way.  321 is
 stabilized with titanium and 347 with columbium.  Most A/C exhaust
 systems are 321.

 Bill

Ah So! That is why some of those cheap SS boat fittings parts rust
around the weld! Thanks Bill.
Paul Lamar

This list really drives home how much I don't know.   Jerry

Join the club. Me too.
Paul Lamar

Ken Powell wrote:

And to think that I was going to try this on my own.  My RV-4 project would have been doomed to failure.
Thanks to everyone for the education - especially on safety issues.  I am still working my way thru AC 43.13-1b & 2A.  The guys on the 'other list' don't know what they are missing.

 
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