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P22 Creep Data Request

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pjdobson

Mechanical
Joined
Dec 13, 2006
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US
Does anyone know of any good P22 creep data that I might be able to get a hold of? Specifically I am looking for the effects of creep if you increase the operating temperature from 900F to 950F for P22. I found some data on creep for P22 tubing in terms of time to rupture (hr) vs. test temperature (C), as well as stress (MPa) vs. test temperature (C), but I am not sure how to interpret the results as they are widely varying, especially for the time to rupture (hr) vs. test temperature (C). This particular graph (semi-log) shows a wide range of failure times at a particular temperature. For example, at T=500C, the data points for time to failure seems to range from approximately 200 hr all the way up to 200,000 hr, which doesn't make a lot of sense. If anyone has any good information or can point me into the right direction, I would greatly appreciate it.
 
pjdobson;
What you really need are creep deformation rates for P22, not specifically creep rupture times. A good source of creep deformation data for Grade 22 material can be obtained in;

STEAM by Babcock and Wilcox Co
Damage Mechanisms and Life Assessment of High-Temperature Components by Viswanathan
Literature Survey on Creep Damage in Metals by ASTM, STP-391 Publication

for creep rupture properties as a function of temperature

The Grade 22 alloy Handbook from EPRI

Good database for creep properties (register for free)
 
See API 530 which shows creep rupture data including Larson Miller curve.
 
pjdobson,
British Standard PD6525 contains Creep Data and LM curves for a number of material including P22 material both normalised and annealed versions.
 
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