Special Metals does it for you, Incoloy is Fe based and Inconel is Ni based.
Seriously though, 825 is an attempt at pushing enough Ni in a SS to get beyond the CSCC range, and still keep the alloy stable. There are plenty of other SS grades with better pitting corrosion resistance than 825 as it has modest Cr and Mo content (but this does help phase stability).
Most of the true Ni alloys have little Fe, usually <10%. There are some odd balls such as X or 718, but you have to think of corrosion resistant alloys separately from high temperature grades.
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P.E. Metallurgy, consulting work welcomed