This standard specifies for the aerospace application, the mechanical properties for precision castings, not heat treated, in heat resisting nickel base alloy NI-C99HT.
AECMA PREN 2664-1998 history
1998AECMA PREN 2664-1998 Aerospace Series Heat Resisting Nickel Base Alloy Ni-C99HT Not Heat Treated Precision Castings Edition P 2
1988AECMA PREN 2664-1988 Aerospace Series Heat Resisting Nickel Base Alloy Ni-C99HT Not Heat Treated Precision Castings Issue P 1