Post by ringoism on Aug 11, 2017 3:33:44 GMT -8
Ah... hostingpics looks to be French, to which I have no objection (except that I don't read/write/speak French). I'll try and figure something out.
Meanwhile:
www.outokumpu.com/SiteCollectionDocuments/Austenitic-High-Temperature-153MA-253MA-stainless-brochure.pdf
"Outokumpu 253 MA® is an excellent choice for high to very high temperatures
(700–1100°C), particularly for conditions involving erosion-corrosion in oxidizing and
neutral environments, as well as sulfur attack. The excellent mechanical strength at high
temperatures allows higher loads or thinner wall thickness than common high-temperature
steels e.g. 309S (EN 1.4833) and 310S (EN 1.4845)"
Sounds highly compelling to me and addresses our concerns about oxidizing environments.
Granted there are some stove designs out there that would probably run at 1200C regularly, but that is not to say this would quickly degrade if pushed only that much; overall most of the ceramics, etc, we've all been using are not much higher (and in some cases lower) rated than this 253MA;
And I remember reading in a few places that we can burn off all the smoke/pollutants we need to at as low as 800-900C. In which case if we're running at 1100+C, we're probably making life a little more difficult for ourselves than it needs to be.
Even the standard 304ss that I lined some of my risers with (basically as a support for the ceramic fiber blankets wrapped around), held up perfectly fine for a season; a friend was burning small-diameter apple prunings, etc. in it, so it was HOT... it was likely getting pushed beyond its service temp (870C in air) by a couple hundred degrees. Not saying it'll last ten years, but then neither does (generally) the clay/castable/insulating brick that so many have been using.
Very likely by the time this wears out, most of us would be on to a new builds anyway.
My conclusion: If portability / easy formability are concerns, sheet metal would seem to have its place. We are not talking about YouTube/FB experimentals... We're talking about carefully selecting / sourcing / integrating appropriate high-grade alloys. Which is what a lot of "engineering" comes down to.
-Eric
Meanwhile:
www.outokumpu.com/SiteCollectionDocuments/Austenitic-High-Temperature-153MA-253MA-stainless-brochure.pdf
"Outokumpu 253 MA® is an excellent choice for high to very high temperatures
(700–1100°C), particularly for conditions involving erosion-corrosion in oxidizing and
neutral environments, as well as sulfur attack. The excellent mechanical strength at high
temperatures allows higher loads or thinner wall thickness than common high-temperature
steels e.g. 309S (EN 1.4833) and 310S (EN 1.4845)"
Sounds highly compelling to me and addresses our concerns about oxidizing environments.
Granted there are some stove designs out there that would probably run at 1200C regularly, but that is not to say this would quickly degrade if pushed only that much; overall most of the ceramics, etc, we've all been using are not much higher (and in some cases lower) rated than this 253MA;
And I remember reading in a few places that we can burn off all the smoke/pollutants we need to at as low as 800-900C. In which case if we're running at 1100+C, we're probably making life a little more difficult for ourselves than it needs to be.
Even the standard 304ss that I lined some of my risers with (basically as a support for the ceramic fiber blankets wrapped around), held up perfectly fine for a season; a friend was burning small-diameter apple prunings, etc. in it, so it was HOT... it was likely getting pushed beyond its service temp (870C in air) by a couple hundred degrees. Not saying it'll last ten years, but then neither does (generally) the clay/castable/insulating brick that so many have been using.
Very likely by the time this wears out, most of us would be on to a new builds anyway.
My conclusion: If portability / easy formability are concerns, sheet metal would seem to have its place. We are not talking about YouTube/FB experimentals... We're talking about carefully selecting / sourcing / integrating appropriate high-grade alloys. Which is what a lot of "engineering" comes down to.
-Eric