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Upper temperature limitation of API 5CT N80.

Upper temperature limitation of API 5CT N80.

Upper temperature limitation of API 5CT N80.

I am designing a pipe line, based on B31.3 Chapter IX.
Design conditions:
P (internal design gage pressure) = 15000psi
T (design temperature) = 400°F
d (required minimum inside diameter of the pipe )= 5,125in

There is no material listed (table A1 or table k1) that results in acceptable thicknesses.
I would like to use API 5CT N80, which has a high yield stress - 80 ksi.
I would like to know what is the upper temperature limitation of API 5CT N80 Type 1 Carbon Steel. Does it yield stress keep at 80 ksi up to 400°F temperature?

RE: Upper temperature limitation of API 5CT N80.

Not easy to find and not in the ASME Codes. I think there could be factors in the API codes.
NZS2403 has this table.

RE: Upper temperature limitation of API 5CT N80.

Thank you KeVinNZ!
It´s difficult to find this factors.

I have another question. Has anybody ever use the N80 or other API 5CT one to use as a line pipe? It´s possible?
I need a material that resist 15000psi at 400°F. Does somebody have a sugestion?

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