Mailing List flyrotary@lancaironline.net Message #43530
From: <wrjjrs@aol.com>
Subject: Re: [FlyRotary] Re: exhaust building
Date: Thu, 24 Jul 2008 13:02:13 -0400
To: <flyrotary@lancaironline.net>
Michael,
321 is prefered for exhaust for 2 reasons. The ti in the mix helps prevent carbide parcipitation which can cause cracking, and becomes worse with more heat cycles. 321 also has a slightly lower coeficient of linear expansion which helps to lower heat cycle stresses. 304 will work fine in thicker sections. 
Bill Jepson 


-----Original Message-----
From: Michael Silvius <silvius@gwi.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 24 Jul 2008 9:12 am
Subject: [FlyRotary] Re: exhaust building

Dale:

I guess my question is;  is it acceptable to use the more readily available
304 SS and what thickness (.065 seems to be common) for our application or
should we hold out for 321?
most of the 321 seems to be available in .035 wall. Is that thick enough?

Michael



----- Original Message ----- 
From: "Dale Rogers" <dale.r@cox.net>


> Michael Silvius wrote:
> > ... what is the difference between that and 321 and which is preferable
for our
> > exhaust building?
>
> 304 has about 6% more Chromium and about 100x the Nickel content of 321.
> 321 contains about .7% Titanium; 304 has none.
>



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