FSX-414 is one of the most widely applied cobalt-base casting alloys for gas turbine nozzles, combining solid-solution strengthening with a high chromium content that delivers strong resistance to sulfidation, oxidation, and thermal fatigue cracking. Its good weldability supports repair of service-damaged nozzle segments, making it a preferred material for long-life industrial and aero-derivative gas turbine applications. Qualified under B50A489, it is produced by vacuum arc casting for consistent chemistry and cleanliness.