Dear sonmech,

I did a quick internet search and came up with this - it will tell you what you need to know.

http://www.alleghenytechnologies.com/ludlum/Documents/316ti.pdf

To get this, I placed the following text in the Google textbox:

+316Ti +composition

It is amazing what you can find on the internet by learning how to effectively use search engines.

Mike

Such A high value Superalloy as 316Ti for only a 800ºC Flue Gas Duct?

If you want a prompt low cost delivery, ask Hendrix with your Hi Temp situation, Life/Cost equation etc.

They will quote and supply the best value flue duct--ready to use.

CR4 colleagues should see the revealing pictures of Corrosion,Fatigue,Scaling of alloys at

http://www.hghouston.com/photoset.html

Yes, I need to assure that after some operation my structure will not be burned out and destroy every things

SS 316Ti characterized very high scaling at 450 deg C and more

Regards

Yuri

I have experience using valves and dampers to control the exhaust back pressure on automotive engine test stands at temps ranging up to 1000C.

750-800 C (glowing cherry red) is the point at which you need to consider many factors. The chemical makeup of the exhaust, it's moisture content, flow rate and pressure are the most obvious. Is the flow pattern or velocity directly impinging the item or is it in the boundary layer? But perhaps the most critical issue is function and longevity. If our tests were short term and "one off", inexpensive materials could be used. If the components were part of a long term project that was expected to last many months or even years, a lot of thought was given to the cost/benefit issue.

One of the most overlooked details is the effect of thermal cycling on any material. And it's not just the varied "heat treating", the properties of the flue gas change with temperature too.

It isn't clear what the purpose of your "structure" is for. Are you testing something that will be removed or is it part of a control or measuring system, something that has to perform as designed over and over without fail? Or is cost not really an issue and you are just wanting the best material?

Lastly, I've learned to take the spec temperature with a grain of salt. Unless it's a large, high flow rate system, the temperatures vary greatly in the duct with distance with from the source and the actual flow rate. Make sure you know the maximum temp where the item will be located.

Sorry, but I can't be more specific because as always, "it just depends". Since you are considering 316Ti, I assumed this was important to you.

Dear Zippy2,

Good Morning to you.

So mature are your observations.

Couldn't the Original questioner be clearer and more complete?

If he could come out-even now- with more--he will get much more back!

That will be a complete story.

BR