Subject: Re: Temp Resistant Tube

From: [email-masked]
Date: Tue, 20 Feb 1996 18:15:45 -0500

To All,
The high temperature alloy mentioned in George's note are oxidation and or
corrosion resistant at high temperatures in very oxidizing environments. The
have good strength up to 2000*F more or less. I would imagine that no one
makes mechanical tubing in these alloys. Seamless tube may be available. Be
forewarned, these alloys are EXPENSIVE. They are also a bitch to work. Just
cutting them is no easy task. The warpage that is experienced in hot
applications is often the result of residual stresses being relieved at
different rates or times. To minimize the warpage the materials should be
well annealed, i.e., uniformly, before and after assembly. This is usually a
box furnace operation. Even mechanical tubing that is welded hot is tweeked
after welding to straightened it. This tweeking is enough to set up stress
fields strong enough to warp the tubing.

Food for thought,

Bill Hochella

---

From: [email-masked]
Date: Wed, 21 Feb 1996 09:29:38 -0500

To All,
Invar is 36% nickel, not cheap either and it is hard to find in limited
quantities. The Chromium in the other alloys contribute a lot to the high
temperture corrosion and oxidation properties. Well stress relieved carbon
steel and a design that can "float" with the expansion sholud work well.

Regards,

Bill Hochella

---

From: [email-masked]
Date: Fri, 23 Feb 96 16:57:15 PST

On Tue, 20 Feb 1996 16:40:17 -0500  George Dixon wrote:
>       Hi,
>Anyone have any ideas on a square tube alloy (in 3/4" or 
1" square) that is
>resistant to warping in a high heat (wood fire) 
situation.  I am framing a
>fireplace opening to carry applied chased and chiseled 
sheet, pierced for
>tempered glass.  I would like to find a tube alloy for 
the frame that will
>not torque or bow when set within 6" to 8" of the fire.
>
>Also, in the same vein, is anyone familiar with:
>Waspaloy, Rene 41, L-605 or Hastelloy C-X   ???  Beyond 
having heard them
>referenced as "high temp alloys" I am in the dark.
>
>Thanks
>George Dixon
>
>

I don't know if you are going to have much luck with this 
search.  The only high temp alloys I am aware of 
(inconelle, waspaloy) are REALLY EXPENSIVE!!!  The are 
high nickel alloys, very red hard, difficult to work and 
cut (inconelle is supposed to be abrasive cut only, or so 
they tell me).  I have forged waspaloy (I keep misspelling 
that word!!) and it is really tough stuff.  I got it as 
scrap from a local open die forging shop.

Have you thought of heavy gauge stainless?  As a whole, 
stainless is pretty resistant to the effects of heat.  I 
am not certain about it's coefficient of expansion, 
though.  Let us know if you find something!

-----------------------------------------------------
Name: Franklyn D. Garland        A Hobby Is Hard work
E-mail: [email-masked]          You wouldn't Do For
Date: 02/23/96                     A Living.
Time: 16:57:15

http://www.mcs.net/~frnklyn/homepage/
-----------------------------------------------------