Inconel 625
A solid-solution-strengthened nickel superalloy with outstanding corrosion resistance in aggressive environments. Inconel 625 excels in marine, chemical processing, and aerospace exhaust applications where IN718's precipitation hardening isn't required.
About Inconel 625
Inconel 625 derives its strength from the solid-solution hardening of niobium and molybdenum in a nickel-chromium matrix. Unlike IN718, it does not require aging heat treatment — the as-built or stress-relieved condition is often sufficient for service.
The alloy offers exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride environments, as well as resistance to a wide range of acids. This makes it a preferred material for subsea oil & gas components, chemical reactor vessels, and marine exhaust systems.
In AM, IN625 processes well via LPBF with >99.5% density. Its lower susceptibility to solidification cracking (compared to IN718) makes it more forgiving to process parameter variations.
Typical Applications
- Marine and subsea components
- Chemical processing equipment
- Aerospace exhaust ducting and heat shields
- Flue gas desulphurisation systems
- Nuclear waste processing equipment
Engineering Considerations
- Lower strength than IN718 — not suitable where precipitation-hardened properties are needed
- Excellent weldability simplifies hybrid build and repair strategies
- Simpler heat treatment (stress relief only) reduces post-processing lead time