"RA 602 CA®[sup]7[/sup] (N06025) Extremely oxidation-resistant grade; one of strongest available at extreme temperature. Used
through 2250°F. Applications include CVD retorts, vacuum furnace fixturing, rotary calciners"
[sup]7[/sup] Registered trade name of ThyssenKrupp VDM
Re impact of nitriding on high T oxidation. [Warning, my opinion]:
If nitrided by a high T process that formed CrN, oxidation resistance would suffer. If nitrided < 400 C, the effect would be less, but of course nitrides would form anyway when heated to high T.
I could be wrong (if the Al ties up all the N or if Cr oxynitride forms), but the effect would be 1) lower alloy Cr concentration, and 2) nitride particles might interfere with formation of a continuous, protective Cr[sub]2[/sub]O[sub]3[/sub] film.