North American Equivalents to Euro Grades

[Macdost]

I have a database with NA equivalents to Euro grades, the following I cannot find, anyone have equivalents?:

10CrMOVNb9

22CrMoV12

21CrMoNiV4

I appreciate any assistance on this, thank you

 

[EdStainless]

My 2013 Stahlschlussel does not list any of these grades.
What specs are they listed in?

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P.E. Metallurgy, Plymouth Tube

 

[metengr]

These look like power generation steels for turbine parts;

http://www.vallourec.com/fossilpower/EN/Products/Pages/tp91.aspx

SA 213 T91 is close

22CrMoV12
Looks like a martensitic stainless steel with V

21CrMoNiV4
This looks like a 1 Cr-0.7Mo- 1Ni - 0.25V turbine rotor steel