Nickel 625 (UNS N06625) is an austenitic nickel-base superalloy possessing excellent resistance to oxidation and corrosion over a broad range of corrosive conditions, including jet engine environments and in many other aerospace and chemical process applications. Nickel 625 has outstanding strength and toughness at temperatures ranging from cryogenic temperature to 2000°F (1093°C). This alloy also has exceptional fatigue resistance. Nickel 625 derives its strength from the solid solution strengthening effects of molybdenum and columbium on the nickel-chromium matrix.

These elements also contribute to the alloy’s outstanding corrosion resistance. Although the alloy was developed for high temperature strength, its highly alloyed composition provides a high level of general corrosion resistance to a wide range of oxidizing and non- oxidizing environments. The levels of chromium and molybdenum provide excellent resistance to chloride ion pitting and the high level of nickel provides resistance to chloride stress corrosion cracking