Nickel alloys
INCONEL 625
Named alloy identity; UNS does not by itself specify product form, condition, or certificate acceptance.
Identity / state reference
What distinguishes this material
Molybdenum and niobium strengthen the solid solution. Do not transfer the aging schedule or aged strength of 718 to 625.
- Designation in this reference
- UNS N06625
- Forms covered by the sources
- Bar / rod and other mill forms: verify availability and specification in the linked bulletin
- States to distinguish or confirm
- Annealed or solution-treated
- distinguish cold-worked material
- Temperature and exposure
- A service-temperature statement is not an allowable stress or a guarantee at temperature. Use the specified product condition and exposure duration.
Other search names in these sources
N06625 · Alloy 625
Read the scope above: a source’s related product name is not a blanket interchangeability statement.
Property evidence for a stated condition
No condition-specific numerical table is reproduced here
The linked sources establish the identity and the stated product/state scope. Obtain the row for your actual form, section, treatment and test conditions before adopting strength, hardness or a thermal limit.
Resolve these conditions next
- Which product form and governing purchase specification are on the certificate?
- What heat treatment, cold work and test temperature apply to this lot?
For machining, take the exact grade, supplied condition and measured hardness where applicable into the tool maker’s application data. A generic material-family speed is not a substitute for an operation and tool-specific recommendation.
Sources and what they establish
Reviewed 23 October 2026. A source’s publication date and the review date are different. The scope below identifies the fields checked.
Special Metals: INCONEL 625 technical bulletin
Grade identity, product forms, treatment distinctions; published property tables remain specific to the conditions stated in the bulletin.
Special Metals: INCONEL 625 technical bulletin ↗Source identity, a named product example and a supplied-batch certificate are different evidence. Cross-standard similarity does not approve substitution.
Corrections from the previous article
- The old 30–35 HRC description is not a universal hardness for annealed 625.
- Remove unsupported legacy machining percentages and generic cutting-speed tables.
Separate nickel-alloy families
Compare the full grade and supplied condition. INCONEL and MONEL labels do not describe interchangeable chemistries or treatment states.