[Stoves] RE: Durability of Stainless Steel

[Crispin Pemberton-Pigott]

Dear Dean

Of that group, the two with the highest temperature resistance are 309
(which is a European knock-off of 3CR12) and 409.

3CR12 is a titanium-stabilized low chrome stainless with a maximum working
temperature of 750 C.  Above that the chrome starts to precipitate and the
oxidation sites on the iron are exposed as the chrome finds its like and
forms little balls.  Rust is the result.  It is very abrasion resistant.

409 is used on catalytic converters and has a working temp of up to 745 or
so.  The destruction process is about the same.

The others are more susceptible to heat, though they resist other things
like acids and alkalis better up to certain temperatures.

None of them will last a long time at 975 so whatever you are doing, use 309
or 409 and plan to replace the part (i.e. design it to be easy to do so).

Regards
Crispin

----- Original Message ----- 
From: "Dean Still" <dstill at epud.net>
To: "'Stoves-List'" <stoves at listserv.repp.org>; "'ethos'"
<ethos at vrac.iastate.edu>
Sent: Sunday, June 04, 2006 3:31 AM
Subject: [Stoves] Durability of Stainless Steel


Dear STOVERS,

Does anyone have the practical experience to predict the lifespan of 309,
310, 304 and 430 Stainless Steel at 975C?

Best,

Dean



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