Don't believe that chrome vanadium is not for impact sockets, it is not true. some of the best impacts are CR-V alloy. Read the description.
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This is a set, way over priced by amazon real cost is about $400-450.
Amazon.com: Hazet 900S 23 Pc 1/2" Metric Impact Socket Set : Tools & Home Improvement
www.amazon.com
Stahlwille uses chrome alloy and not inexpensive either.
Stahlwille Tools 50IMP 1/2" 6-pt Impact Socket, 17 mm
www.kctoolco.com
Stahlwille Tools 50IMP/6/2 Impact Socket Set
www.kctoolco.com
That is not to say the CR-V from horror freight are the same alloy as these but it is used for impacts as part of a alloy.