Materials / Nickel alloy
Monel K-500
- UNS
- N05500
- W.Nr
- 2.4375
- EN
- NiCu30Al
Age-hardenable Monel, using aluminium and titanium to roughly triple the yield strength of 400 while keeping its seawater performance.
Composition
| Element | Min | Max |
|---|---|---|
| Ni | 63.0 | — |
| Cu | 27.0 | 33.0 |
| Al | 2.30 | 3.15 |
| Ti | 0.35 | 0.85 |
| Fe | — | 2.0 |
| Mn | — | 1.5 |
| C | — | 0.25 |
Per cent by weight, to the governing standard.
- Ni66.7
- Cu30.0
- Al2.7
- Ti0.6
Per cent by weight, at the midpoint of each specified window. Elements given only as a maximum have no midpoint to take, so they sit inside the balance rather than being estimated; trace elements below 0.5 % are not shown. Indicative only; the composition table above and the governing standard are what define the limits.
Mechanical
- Tensile strength, min
- 965 MPa
- Yield strength (0.2%), min
- 690 MPa
- Elongation, min
- 20 %
- Condition
- Age hardened — condition to be specified on order
Standards by form
| Bar, rod & forgings | ASTM B865 | |
|---|---|---|
| Fasteners | ASTM F467 / F468 |
Where it is specified
- Pump shafts, propeller shafts, fasteners and valve stems in marine service
- Strength of a structural alloy with the corrosion behaviour of Monel 400
- Non-magnetic and spark-resistant
Over-ageing buys strength and hydrogen embrittlement together
K-500 is vulnerable to hydrogen embrittlement if over-aged or over-hardened, which makes the heat treatment record and the hardness result the safety-critical documents. Aluminium below the 2.30 % floor means the age hardening cannot reach specified strength.
What we specify and check
- Hardness verification on the delivered material
- Heat treatment records demanded and read
- PMI for Al and Ti against B865
We commission an accredited independent laboratory to test the heat before the material leaves China. You will receive that report unedited, whether it passes or not.
Request Monel K-500
Tell us the form, dimensions and service conditions. We reply with availability, indicative landed price, lead time and the test regime we would specify for your application.
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