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Yield stress of 9 chrome at 1375 deg F

Yield stress of 9 chrome at 1375 deg F

Yield stress of 9 chrome at 1375 deg F

(OP)
I have been asked by a client to rerate heater tubes to 1375 deg F and 890psi. Spent a fair amount of time trying to find yield strength data for 9 chrome at that elevated temperature. Also, API 530 larson miller parameter tables stop at 1300 deg F. Looking for some guidance on locating material data for the material to see if it’s even possible to make work. I do not want to get into a code discussion, this is not a code state and the client is willing to accept those risks.

RE: Yield stress of 9 chrome at 1375 deg F

Straight 9Cr or 91?
I have pages of data on 2 1/2Cr and on 409/410, but almost nothing on 9Cr.
You might try looking at EPRI guides as well.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Yield stress of 9 chrome at 1375 deg F

(OP)
Strait 9Cr

I spoke with a buddy of mine that is a metallurgist and another one from a separate client..between them two and the responses I’m getting here…sounds like a no no!

Thanks to all for the comments!

RE: Yield stress of 9 chrome at 1375 deg F

Vry close to lower critical; sounds like a bad idea.

RE: Yield stress of 9 chrome at 1375 deg F

JG... FYI ... when presenting a question like this...

Exactly what material spec was this alloy made per? The spec will define the entire chemistry and processing and provide clarity as to the specific material in question. IF any thing, what is the material UNS???

What is the environment of the exposure??? Air? Combustion-products? Inert gas? Vacuum? Plasma?

Regards, Wil Taylor
o Trust - But Verify!
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation, Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", HBA forum]
o Only fools and charlatans know everything and understand everything." -Anton Chekhov

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