Nickel alloys / UNS N04400
Monel® 400 is a nickel-copper alloy with high strength and excellent resistance to seawater, hydrofluoric acid and alkalis, widely used in marine and chemical engineering.
- UNS N04400
- W.Nr. 2.4360
- Spec ASTM B127
- Density 8.8 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | N04400 |
| W.Nr. | 2.4360 |
| EN | NiCu30Fe |
| Also known as | Alloy 400, 2.4360, NiCu30Fe |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| Ni | 63.0 | — |
| Cu | 28.0 | 34.0 |
| Fe | — | 2.5 |
| Mn | — | 2.0 |
| C | — | 0.3 |
| Si | — | 0.5 |
| S | — | 0.024 |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength (min) | 485 MPa (70.3 ksi) |
| Yield strength, 0.2% offset (min) | 195 MPa (28.3 ksi) |
| Elongation in 50 mm (min) | 35 % |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.8 g/cm³ | 0.318 lb/in³ |
| Magnetic response | Slightly magnetic at room temperature | — |
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® 400: Marine fittings, pumps, HF alkylation. Chemical and petrochemical plant, sour-gas and oilfield equipment, furnace and heat-treatment hardware, power generation, marine engineering and aerospace components.
Monel® 400 vs Monel® K-500
| Monel® 400 | Monel® K-500 | |
|---|---|---|
| UNS | N04400 | N05500 |
| Key property | Ni-Cu, seawater & HF resistant | Age-hardenable Ni-Cu |
| Typical use | Marine fittings, pumps, HF alkylation | Pump shafts, oil-well tools, springs, fasteners |
| Cr (wt %) | — | — |
| Ni (wt %) | 63.0 | 63.0 |
| Mo (wt %) | — | — |
| C (wt %) | ≤ 0.3 | ≤ 0.25 |
| Tensile / yield (min, MPa) | 485 / 195 | — |
Frequently asked questions
What is the UNS number of Monel® 400?
Monel® 400 is designated UNS N04400 (W.Nr. 2.4360, EN NiCu30Fe).
What is Monel® 400 used for?
Ni-Cu, seawater & HF resistant. Typical uses: marine fittings, pumps, hf alkylation.
Is Monel® 400 magnetic?
Slightly magnetic at room temperature.
In which forms can I buy Monel® 400 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® 400?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
What is the difference between Monel® 400 and Monel® K-500?
Monel® 400: ni-cu, seawater & hf resistant. Monel® K-500: age-hardenable ni-cu. 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.
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