Monel 400 — Sheet, Plate, Coil, Pipe & Tube & Fittings
Also sold as Alloy 400 · UNS N04400 · W.Nr 2.4360 · Nicorros
Monel 400 is a nickel–copper alloy, chosen for seawater, hydrofluoric acid and marine service. We manufacture, trade and export it as sheet, plate, coil, pipe & tube, fittings, flanges, fasteners; EN 10204 3.1 or 3.2 certificates are available on request / as specified in the PO. Markets we have supplied to include Oman, UAE, Saudi Arabia, Brazil, Argentina, Spain and Chile (India is the home market).
- UNS N04400
- W.Nr 2.4360
- ρ 8.8 g/cm³
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
Monel 400 Products
Monel 400 Names, Designations & Composition
Monel 400 is one alloy sold under several names. Its UNS number is N04400, the European material number is W.Nr 2.4360 and the EN name is NiCu30Fe. The chart on the right shows the specified range of each main alloying element; the balance is the base metal.
Monel 400 Specifications by Product — Which Standard Applies?
The material standard changes with the product form. This is the table buyers ask for most.
| Product | Material standard | Dimensions |
|---|---|---|
| Monel 400 sheet | ASTM B127 | ASTM A480 / B906 |
| Monel 400 plate | ASTM B127 | ASTM A480 / B906 / A20 |
| Monel 400 coil | ASTM B127 | ASTM A480 |
| Monel 400 pipe & tube | ASTM B165 · ASTM B725 | ASME B36.19 / B36.10 |
| Monel 400 fittings | ASTM B366 WPNC · ASTM B564 | ASME B16.9 · B16.11 |
| Monel 400 flanges | ASTM B564 | ASME B16.5 · B16.47 |
| Monel 400 fasteners | ASTM F468 (N04400) where specified for applicable bolts, hex cap screws, socket-head cap screws and studs (0.250–1.500 in.), and ASTM F467 for applicable nuts (0.250–1.500 in.); for other types, material may be supplied to ASTM B164 bar where applicable, subject to the purchase specification | ASME B18.2.1 · B18.2.2 |
Monel 400 Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Nickel (+Co) | As specified |
| Copper | As specified |
| Iron | As specified |
| Manganese | As specified |
| Carbon | As specified |
| Silicon | As specified |
| Sulphur | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM B127 for UNS N04400.
Monel 400 Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM B127 for UNS N04400 — Annealed plate.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 8.8 g/cm³ |
| Melting range | 1300 – 1350 °C |
| Magnetic | Slightly magnetic at room temperature |
Monel 400 Equivalent Grades
Monel 400 Corrosion Resistance — What Each Element Does
Very low corrosion rates in flowing seawater and brackish water.
One of the few alloys that handles hydrofluoric acid in all concentrations (air-free).
Resists caustic alkalis and chloride stress-corrosion cracking.
Avoid nitric acid, aerated ammonia and oxidising salts.
Monel 400 vs 625, 2507 and 316L
| Grade | PREN (approx.) | Pick it for |
|---|---|---|
| Monel 400 | — | Seawater, hydrofluoric acid and marine service |
| SS 316 / 316L | ≈ 24 | Chloride-bearing process fluids, marine air and pharmaceutical service |
| Super Duplex 2507 | ≈ 42 | Seawater and high-chloride service where strength also matters |
| Inconel 625 | ≈ 51 | Seawater, high strength and high temperature in one alloy |
Welding Monel 400
| Matching filler | ERNiCu-7 (AWS A5.14) |
|---|---|
| Also used | ENiCu-7 electrode |
Monel 400 — questions buyers ask
What is Monel 400?
Monel 400 is a nickel–copper alloy. It is chosen for seawater, hydrofluoric acid and marine service.
Which standards cover Monel 400 products?
Sheet: ASTM B127; Plate: ASTM B127; Coil: ASTM B127; Pipe & Tube: ASTM B165 · ASTM B725; Fittings: ASTM B366 WPNC · ASTM B564; Flanges: ASTM B564; Fasteners: ASTM F468 (N04400) where specified for applicable bolts, hex cap screws, socket-head cap screws and studs (0.250–1.500 in.), and ASTM F467 for applicable nuts (0.250–1.500 in.); for other types, material may be supplied to ASTM B164 bar where applicable, subject to the purchase specification. Always name the standard and edition on your order.
What is the UNS number of Monel 400?
UNS N04400, with the European material number W.Nr 2.4360.
What is the density of Monel 400?
8.8 g/cm³ — use it to calculate weights: plate kg = L(m) × W(m) × t(mm) × 8.8.
Monel 400 or SS 316 / 316L?
Monel 400 suits seawater, hydrofluoric acid and marine service; SS 316 / 316L is the step up for chloride-bearing process fluids, marine air and pharmaceutical service.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026