Alloy 625 is a Nickel-Chromium alloy used for its high strength, excellent fabricability and outstanding corrosion resistance. Service temperatures range from cryogenic to 1800° F. Alloy 625 strength is derived from the stiffening effect of molybdenum and columbium on its Nickel-Chromium matrix; thus precipitationhardening treatments are not required. This combination of elements also is responsible for superior resistance to a wide range of corrosive environments of unusual severity as well as to high-temperature effects such as oxidation and carburization.

Design Features 

Outstanding resistance to pitting, crevice corrosion, impingement corrosion and intergranular attack.

Almost complete freedom from Chlorideinduced stress corrosion cracking.

Good resistance to mineral acids, such as nitric, phosphoric, sulphuric and hydrochloric acids.

Good resistance to alkalis and organic acids.

Good mechanical properties.

Chemical Composition %

Mechanical Propertoes