SAE AMS 5666: 2016 [pdf]

SAE AMS5666 – Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, Extrusions, and Rings 62Ni – 21.5Cr – 9.0Mo – 3.65 Cb (Nb) Annealed, Revision H

This specification covers a corrosion and heat-resistant nickel alloy in the form of bars, forgings, extrusions, flash welded rings, and stock for forging, extruding, or flash welded rings up to 10 inches (254 mm) in diameter or least cross-sectional dimension

These products have been used typically for parts requiring both corrosion and oxidation resistance up to 2000 °F (1093 °C) and where such parts may require welding during fabrication, but usage is not limited to such applications.