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Inconel alloys

Inconel 600: Solid solution strengthened
Inconel 625: Acid resistant, good weldability
Inconel 690: Low cobalt content for nuclear applications
Inconel 718: Gamma double prime strengthened with good weldability
Inconel 751: Increased aluminum content for improved rupture strength in the 1600° F range[11]
Inconel 939: Gamma prime strengthened with good weldability

https://www.magellanmetals.com/inconel_X750.html