Allegheny Ludlum AL Altemp® 625 Nickel-Base Superalloy, UNS N06625

Subcategory: Superalloy; Nickel Base

Key Words: DIN 2.4856; ASTM B-443; ASME SB-443; AMS 5599

Material Notes:
Nickel content above calculated as remainder and includes Co.

Allegheny Ludlum Altemp 625 alloy 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. Specific uses include jet engine nacelles, engine plumbing, aircraft ducting, recuperators, and thrust reversers. The alloy has outstanding strength and toughness at temperatures ranging form cryogenic temperature to 1093°C. This alloy also has exceptional fatigue resistance.

The Altemp 625 alloy 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-molybdenum provide excellent resistance to chloride ion pitting and the high level of nickel provides resistance to chloride stress corrosion cracking.

The material posses a high degree of formability and shows better weldability than many high alloyed nickel-base alloys. The alloy is resistant to intergranular corrosion even in the welded condition.

Information provided by Allegheny Ludlum.