Nickel alloys
MONEL 400
Named alloy identity; UNS does not by itself specify product form, condition, or certificate acceptance.
Identity / state reference
What distinguishes this material
Nickel-copper solid solution, hardened by cold work. It is distinct from age-hardenable K-500 and from free-machining R-405.
- Designation in this reference
- UNS N04400
- 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
- cold-worked
- 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
N04400 · MONEL 400
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: MONEL 400 technical bulletin
Grade identity, product forms, treatment distinctions; published property tables remain specific to the conditions stated in the bulletin.
Special Metals: MONEL 400 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 36% machinability rating has no traceable test setup; do not treat 400 as a heat-age-hardened grade.
- Remove unsupported legacy machining percentages and generic cutting-speed tables.
Other references in Nickel alloys
Related references, not equivalent substitutes.