Inconel® 625
(Alloy 625)

Alloy 625 offers versatile corrosion resistance under a wide range of temperatures.

Inconel® nickel-chromium alloy 625 is a material known for its high strength, excellent fabricability (including joining) and outstanding corrosion resistance.

Temperature Performance:

Service temperatures range from cryogenic to 1800°F (982°C). The strength of Alloy 625 comes from the stiffening effect of molybdenum and niobium on its nickel-chromium matrix; thus, precipitation-hardening treatments are unnecessary. This combination of elements 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.

Further Info:

Tests in geothermal brines indicate that Alloy 625 is highly resistant to hot geothermal fluids, comparable to titanium grade 2. Tests in simulated flue gas desulfurization conditions show that Alloy 625 is highly resistant to the environment in comparison to alloys such as T316 stainless steel and comparable to Alloy C276.

Corrosion & Oxidation:

The high level of chromium and molybdenum in Alloy 625 provides a high level of pitting and crevice corrosion resistance to chloride-contaminated media, such as seawater, neutral salts and brines. Alloy 625 is capable of being formed in the same manner as standard austenitic stainless steel.

Specifications:

Inconel® 625 is covered by the following specifications - AMS 5599 (sheet, strip and plate), AMS 5666 (bar, rings and forgings), AMS 5837 (wire), ASTM B-443 (sheet and plate) and ASTM B-446 (bar and rod). The UNS number for this material is NO6625.