Hello avocadozo,
My apologies for overlooking your original request for details on annealing.
I would recommend calling for a dry hydrogen anneal (as mentioned by EdStainless) at 1600 degF for a minimum of one hour at temperature.
One thing to keep in mind, the annealing can distort the part somewhat, enough to ruin any tight tolerances. I'd suggest having the annealing done before machining any tight tolerance features onto the part.
Good luck!