alternatives to 321/347

[Mous1747]

There is a long lead time to all the equipment made out of 321/347 SS

Is there an alternative material i can use ?

Temp 1250°

Pressure 115 psig

Media Nitrogen oxide gases (Nox up to 10,000 ppm)

 

[EdStainless]

Order early enough?
There are some 800 and 600 series alloys that are stabilized, but they will be a lot more expensive.
Start searching the Code for grades that have reasonable allowed stress at your service temp.


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P.E. Metallurgy, consulting work welcomed

 

[0707]

temperature is Farenheit or Celsius?

 

[kingnero]

I hope that's F

 

[Chumpes]

Ni-Alloy 625 is stabilized by Nobium addition and it will be able to withstand Tdesign 1250F as per ASME BPVC code.

 

[MJCronin]

How many more questions do we have to ask you before you reveal to us specifically WHAT EQUIPMENT that you are talking about ? ... Is it piping, flanges, valves, turbines or something else ? .... No sense in telling us right away ....

When will you give us the whole picture ?.... after ten or fifteen more requests ?

Oh, wait .... you are being called away on an "urgent family matter" .... you will be deeply sorry when you return to this slowly developing thread ...



MJCronin
Sr. Process Engineer

 

[EdStainless]

As are 825, 945, 725, 693 and a bunch more. Some are Ti or Nb only and some are both.

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P.E. Metallurgy, consulting work welcomed

 

[0707]

If you are speaking 676 ºF, TP321H or TP347H, is not such bad, be ware that along the time, you can have sigma fhase formation in these kind of materials. But as MJCronin said try to be more specific and tell us the whole story.