Nickel alloys / UNS N05500
Monel® K-500 is an age-hardenable nickel-copper alloy: aluminium and titanium additions give roughly three times the yield strength of Monel 400 while keeping its corrosion resistance.
- UNS N05500
- W.Nr. 2.4375
- Spec ASTM B865
- Density 8.44 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | N05500 |
| W.Nr. | 2.4375 |
| EN | NiCu30Al |
| Also known as | Alloy K-500, 2.4375, NiCu30Al |
Chemical 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 |
| Si | — | 0.5 |
| S | — | 0.01 |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.44 g/cm³ | 0.305 lb/in³ |
| Magnetic response | Non-magnetic (low permeability) | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Sheets & plates | ASTM B168, B443, B409, B424, B127, B162 | 0.3 mm – 6 mm |
| Seamless pipe & tube | ASTM B167, B444, B407, B423, B165, B161 | 1/8" – 24" NB |
| Bars & rods | ASTM B166, B446, B408, B425, B164, B160 | 3 mm – 500 mm |
| Flanges & forgings | ASTM B564 | 1/2" – 48" NB (larger on request) |
| Buttweld fittings | ASTM B366 | 1/2" – 48" NB |
Corrosion & temperature resistance
Nickel-based alloys resist caustic alkalis, chloride stress-corrosion cracking and many acids, and keep their strength and oxidation resistance at temperatures where stainless steels fail.
Applications
Monel® K-500: Pump shafts, oil-well tools, springs, fasteners. Chemical and petrochemical plant, sour-gas and oilfield equipment, furnace and heat-treatment hardware, power generation, marine engineering and aerospace components.
Monel® K-500 vs Monel® 400
| Monel® K-500 | Monel® 400 | |
|---|---|---|
| UNS | N05500 | N04400 |
| Key property | Age-hardenable Ni-Cu | Ni-Cu, seawater & HF resistant |
| Typical use | Pump shafts, oil-well tools, springs, fasteners | Marine fittings, pumps, HF alkylation |
| Cr (wt %) | — | — |
| Ni (wt %) | 63.0 | 63.0 |
| Mo (wt %) | — | — |
| C (wt %) | ≤ 0.25 | ≤ 0.3 |
| Tensile / yield (min, MPa) | — | 485 / 195 |
Frequently asked questions
What is the UNS number of Monel® K-500?
Monel® K-500 is designated UNS N05500 (W.Nr. 2.4375, EN NiCu30Al).
What is Monel® K-500 used for?
Age-hardenable Ni-Cu. Typical uses: pump shafts, oil-well tools, springs, fasteners.
Is Monel® K-500 magnetic?
Non-magnetic (low permeability).
In which forms can I buy Monel® K-500 from Rajkamal Metals?
Coils & Strips, Sheets & Plates, Pipes & Tubes, Round Bars & Rods, Flanges, Buttweld Fittings, Socket Weld & Threaded Fittings, Fasteners, Ferrule / Instrumentation Fittings, Dish Ends, Custom Orders. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with Monel® K-500?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
What is the difference between Monel® K-500 and Monel® 400?
Monel® K-500: age-hardenable ni-cu. Monel® 400: ni-cu, seawater & hf resistant. See the comparison table on this page.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
Request a quote
Need Monel® K-500?
Send the grade, form, size, quantity and destination. Price on request — every offer is prepared against your specification.