Looking for the right Metal

[TheDankDrank]

I am a researcher in Chemical engineering who is currently designing and building a prototype reactor.

Unfortunately because of the specifications I need to meet and my lack of real metal knowledge, it is very hard to find the right kind of metal for my task. Most sites that deal with these metals do so on large quote basis and cannot answer technical questions with ease.

I would appreciate any help.
From the following specifications I need a metal which will not deform at high temperature under the increased pressure.
Preferably something which is relatively inexpensive.

-The flow is non-corrosive
Temperature: 850 C (1562 F)
Pressure: 20 bar (~290 psi)
Other: Must be machinable pipe

 

[ornerynorsk]

What is the time period that the material will be subjected to those temperatures and pressures? For a frame of reference, what approximate diameter pipe or tube are you looking for?

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[TheDankDrank]

Around 1/2in diameter
Time period on longer tests could be a up to 3 days at a time

I have seen alloys like Hastelloy X/C-276 and Inconel 617.
But since initially my order is small its hard to price anything when there are so many choices.

 

[TheDankDrank]

To be clear that was internal diameter

 

[EdStainless]

In a small diameter like that you should be able to go to a distributor of aerospace tubing and buy a length of 718. You will have to heat treat it, but you will get over 180ksi UTS and you can find good strength vs temp curves for it. Very reliable high temp/high strength alloy.

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Plymouth Tube

 

[metengr]

I would consider Haynes 230 alloy tube or pipe. It is rated for maximum use to 1800 deg F, and is permitted for pressure vessel and piping pressure boundary applications. You will need to calculate the thickness required for pressure and temperature, which is why I would use known allowable stress values for this material rather than trying to estimate. Keep yourself out of harms way.

http://www.haynesintl.com/pdf/h1030.pdf