P91 properties

Dear Sirs.
Our company participates in the construction of a thermal power plant, which will be used pipes made of steel A335 Grade P91.
For the calculation of strength, we need data on the properties of steel P91. Unfortunately ASME 31.1 does not contain all the necessary data for the calculations (expected to settle on the Russian method).
Where else can I find these data?
Thank you in advance.

You could try "Google", but a better course of action would be to contact your prospective vendors and ask them for the data.

Richard, thanks for the tip.)
We have a problem like this:
http://65.57.255.42/ubbthreads/ubbthread...=true#Post40883

but just the opposite.
Prospective vendors provide only what is in the ASME.
I would like to find a reference to the properties of the P91, but there is also a problem in the translation of terms from English to Russian and back. I think the reason why the supplier did not understand what we want from him).
And of course I've used Google)))
In such a situation is easier to do calculations on the strength of ASME. But then there is a problem with responsibility limit for the calculations.