Good high temperature strength, and the best 1000 hr stress rupture strength (resistance to fatigue failure) of any Inconel
And an excellent toughness at extreme temperature. Some of the other inconels really lose their toughness over 1400 degrees which could lead to rapid propagation of faults.
It comes in Rod form as well if anyone ever needs to repair it, you have the correct rod AWS 5.14 ERNiCrMo-3