Inconel 625 – Bohler L625 – UNS N06625 – EN-ISO NiCr22Mo9Nb – AMS 5599 – AMS 5666 – AMS 5869 – AMS 5879 – ASTM B-443 – BS NA21 3072 – BS NA21 3073 – BS NA21 3075 – BS NA21 3076 – ASTM B-446 – ASME B-443 – ASME B-446 – JIS G4901 – JIS G4902 – JIS NCF625 – NACE MR0103 – Grade 1 (Annealed) – Grade 2 (Solution Annealed) – ESR/ESU
Alloy 625, also known as NiCr22Mo9Nb or N06625 is a nickel-based superalloy with a high range of operating temperatures, from cryogenic to highly elevated for use in aerospace engines and gas turbines. It displays superb corrosion resistance and is available in grade 1 (annealed) and grade 2 (solution annealed). a softer heat charge may also comply with NACE MR0103 if it’s hardness is < 35 HRC, making Alloy 625 fit for petrochemical applications.
Strength of this alloy is derived from the stiffening effect of molybdenum and niobium (columbium) on the nickel-chrome matrix, therefore a precipitation hardening treatment is not required. It also shows resilience to corrosion from oxidation or carburization. It is also quite resistant to stress-corrosion-cracking (SCC) and sulfide-stress-cracking (SSC).
Alloy 625 is also an excellent choice for sea-water applications, given that salts do not easily cause localized pitting. This is why numerous marine applications are also manufactured from 2.4856 given that they are constantly exposed to salts.
It also finds uses in the aerospace and petrochemical industry for the same reasons, corrosion resistance, high yield-strength and weldability make for a solid all-round material grade.
