Monel 400 SheetASTM B127 UNS N04400 · Manufacturer, stockist & exporter, India
Also sold as Alloy 400 · UNS N04400 · W.Nr 2.4360 · Nicorros
Monel 400 sheet is Alloy 400 (UNS N04400) rolled below 3/16" (4.76 mm) thick for formed, pressed and lined parts under ASTM B127. It is a nickel–copper alloy, chosen for seawater, hydrofluoric acid and marine service. Kanak Steel & Engineering Co. supplies it with EN 10204 3.1 mill certificates from Mumbai to buyers across India, the Gulf, South-East Asia, South America, Europe, the UK and the USA.
- Stock & mill supply
- EN 10204 3.1 / 3.2
- PMI on every heat
- NACE MR0175 on request
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is Monel 400 Sheet?
Monel 400 sheet is a nickel–copper alloy supplied as sheet to ASTM B127 (UNS N04400). Buyers specify it for seawater, hydrofluoric acid and marine service. It is also sold as Alloy 400, UNS N04400, W.Nr 2.4360.
- What it is
- Nickel–copper alloy
- Standard
- ASTM B127
- Thickness
- Below 3/16" (4.76 mm)
- Density
- 8.8 g/cm³
- Supplied as
- Annealed · cold rolled, annealed & descaled
- Best at
- Seawater, hydrofluoric acid and marine service
Monel 400 Sheet Specification & Sizes
| Material standard | ASTM B127 · ASME SB-127 |
|---|---|
| General requirements | ASTM B906 — dimensions, tolerances and finishes |
| Grade | Monel 400 · UNS N04400 · W.Nr 2.4360 |
| Thickness | Below 3/16" (4.76 mm) — thicker is plate |
| Width × length | 1000 / 1219 / 1250 / 1500 mm × 2000 / 2438 / 2500 / 3000 mm, or cut to size |
| Condition & finish | Annealed · cold rolled, annealed & descaled |
| Cutting | Cut to size and to width |
| Testing | PMI · UT (plate) · intergranular corrosion · hardness, on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection · packing list · certificate of origin |
Sheet or plate?
Both are ordered under ASTM B127, so buyers often mix them up. The line is thickness: below 3/16" is sheet, 3/16" and over is plate. If your drawing calls for 3/16" (4.76 mm) or more, you need Monel 400 plate.
Monel 400 Sheet Finishes — Which to Order
Sheet is bought for its surface as much as its chemistry. The finish is set at the mill and cannot be fixed later without polishing cost, so name it on the order. Nickel-alloy finishes are described in words under ASTM B906 rather than by stainless finish numbers.
| Finish | How it is made | Choose it for |
|---|---|---|
| Cold rolled, annealed & descaled | Cold rolled, solution or mill annealed, then pickled | Smooth, uniform matt-to-satin surface. The standard nickel-alloy sheet finish, often called "2B equivalent" in the trade. |
| Bright annealed | Annealed in a protective atmosphere, not pickled | Brighter surface for some thin gauges; confirm availability with the mill. |
| Hot rolled, annealed & descaled | Hot rolled, annealed, then pickled or blasted | Rougher finish on heavier sheet close to the plate boundary. |
Monel 400 Sheet Chemical Composition
| Element | Weight % |
|---|---|
| Nickel (+Co) | 63.0 min |
| Copper | 28.0 – 34.0 |
| Iron | 2.5 max |
| Manganese | 2.0 max |
| Carbon | 0.3 max |
| Silicon | 0.5 max |
| Sulphur | 0.024 max |
Monel 400 Sheet Mechanical Properties
| Annealed plate | Value |
|---|---|
| Tensile strength | 480 MPa · 70 ksi |
| Yield strength 0.2% | 195 MPa · 28 ksi |
| Elongation | 35% |
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
Values follow ASTM B127 for UNS N04400. Always check against the edition named on your purchase order.
Monel 400 Sheet Weight Chart & Calculator
Use this to budget freight and price per piece. Weight (kg) = length (m) × width (m) × thickness (mm) × 8.8.
Example: 2500 × 1250 × 2 mm
2.5 × 1.25 × 2 × 8.8 = 55.0 kg
Total weight —
| Thickness | 2500 × 1250 sheet | Per m² |
|---|---|---|
| 0.5 mm | 13.8 kg | 4.4 kg |
| 0.8 mm | 22.0 kg | 7.0 kg |
| 1 mm | 27.5 kg | 8.8 kg |
| 1.2 mm | 33.0 kg | 10.6 kg |
| 1.5 mm | 41.3 kg | 13.2 kg |
| 2 mm | 55.0 kg | 17.6 kg |
| 3 mm | 82.5 kg | 26.4 kg |
| 4 mm | 110.0 kg | 35.2 kg |
Monel 400 sheet gauge to mm
Gauge numbers are still common on drawings. Weights below use the density of Monel 400, 8.8 g/cm³.
Full chart: SWG sheet gauge chart.
| SWG | mm | inch | kg/m² (ρ 8.8) |
|---|---|---|---|
| 10 | 3.251 | 0.1280 | 28.61 |
| 11 | 2.946 | 0.1160 | 25.92 |
| 12 | 2.642 | 0.1040 | 23.25 |
| 14 | 2.032 | 0.0800 | 17.88 |
| 16 | 1.626 | 0.0640 | 14.31 |
| 18 | 1.219 | 0.0480 | 10.73 |
| 20 | 0.914 | 0.0360 | 8.04 |
| 22 | 0.711 | 0.0280 | 6.26 |
| 24 | 0.559 | 0.0220 | 4.92 |
Six-digit Harmonized System heading (nickel alloy, chapter 75). Your country adds its own digits — confirm with your customs broker. All HS codes.
How to Verify Monel 400 Sheet with PMI
Positive material identification with a handheld XRF gun confirms the alloy on the piece itself, in seconds, before it is cut or welded. Monel 400 is most often mixed up with Monel K500 — the table shows which elements tell them apart.
Handheld XRF does not measure carbon or nitrogen; those come from the mill certificate or optical emission (OES) testing. We PMI-test nickel alloys as standard and any grade on request.
| Element | Monel 400 | Monel K500 |
|---|---|---|
| Nickel | 63.0 min | 63.0 min |
| Copper | 28.0 – 34.0 | 27.0 – 33.0 |
| Titanium | residual | 0.35 – 0.85 |
| Iron | 2.5 max | 2.0 max |
| Manganese | 2.0 max | 1.5 max |
Monel 400 Sheet Price — What Decides It
Two quotes for "400 sheet" can differ by 20% and both be fair. We quote 400 sheet per kg for full sizes and per piece for cut sizes. These six things move the price per kg, so you can compare offers like for like.
Monel 400 Sheet Tolerances, Edge & Flatness
Thickness, width, length and flatness tolerances for 400 sheet come from ASTM B906, the general-requirements standard called up by the product specification. Most quality problems with sheet are about these four, not the chemistry.
| Thickness tolerance | Per ASTM B906 tables, by thickness and width; ask for a tighter range on the PO if your press tooling needs it |
|---|---|
| Edge | Mill edge, or slit / cut edge for an exact width |
| Flatness | Standard flatness per ASTM B906; specify levelled or tension-levelled sheet where flatness is critical |
| Surface protection | PVC / PE film on bright and polished finishes; use laser-grade film if the sheet will be laser cut |
| Marking | Grade, heat number and standard on each sheet, or on each bundle for small pieces |
Sheet, Strip, Plate or Coil?
Under ASTM B906, flat material below 3/16" (4.76 mm) and 24" or wider is sheet; cold-rolled material narrower than 24" is strip; 3/16" (4.76 mm) and over it is plate (the metric edition, B906M, rounds these to 5 mm and 600 mm). Coil is the same product wound up for continuous processing — order coil if you will slit, blank or roll-form it yourself.
Monel 400 Sheet Applications
Sheet goes where 400 has to be formed, pressed or used as a thin lining. For heavy shells, tube sheets and machined parts, see Monel 400 plate.
How your 400 sheet order runs
- 01Enquiry review — we confirm size, standard edition and documents against your MR or drawing.
- 02Heat selection & PMI — the mill certificate is checked and material is PMI-tested before processing.
- 03Processing — cutting to your sizes, with heat numbers transferred to every piece.
- 04Inspection — your third-party inspector witnesses, or we share photos and test reports.
- 05Packing & dispatch — seaworthy packing from Nhava Sheva (JNPT), Mumbai, FOB or CIF, documents sent before the vessel sails.
Standards on this page
Forming & Welding Monel 400 Sheet
Thin sheet is formed, folded and welded with little margin for heat. These are the points fabricators ask us about — matching filler for 400 is ERNiCu-7 (AWS A5.14).
General guidance only; follow your approved WPS and forming procedure.
| Bending | Annealed nickel-alloy sheet forms well but work-hardens fast; use generous radii and anneal between severe operations if needed. |
|---|---|
| Cleanliness first | Remove oil, marking ink, sulphur and lead before welding or heat treatment; they embrittle nickel alloys. |
| Thin-gauge welding | TIG (GTAW) with low heat input and argon back-purge; nickel weld pools are sluggish, so do not over-heat to make them flow. |
| Distortion | Copper backing bars and close tacking keep thin sheet flat. |
How to Order Monel 400 Sheet: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Standard and edition — e.g. ASTM B127-latest
- Thickness × width × length, and number of pieces
- Finish (2B, BA, No.4…) and protective film if needed
- Certificate type — 3.1 or 3.2, and the inspection agency
- Extra tests — NACE, UT, intergranular corrosion
- Delivery port, Incoterm and required date
Monel 400 sheet for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiMonel 400 sheet — questions buyers ask
Is Monel 400 the same as Alloy 400?
Yes. Alloy 400, UNS N04400, W.Nr 2.4360 all refer to the same material, and sheet is ordered to ASTM B127 whichever name is on the enquiry.
What is the price of Monel 400 sheet per kg?
It moves with nickel on the LME, so a fixed list price is out of date within days. Thickness, cut size, quantity and documents also change it. Send your size and quantity and we quote the same working day.
What documents come with an export shipment?
An EN 10204 3.1 mill certificate (or 3.2 with a third-party inspector), commercial invoice, packing list with heat numbers, and certificate of origin. Test reports are added for any extra tests ordered.
Which finish should I order for Monel 400 sheet?
The standard is cold rolled, annealed and descaled, which most buyers call "2B equivalent". Ask for bright annealed only if you need a brighter surface and the mill can supply it in your thickness.
Is Monel 400 sheet ordered by gauge or by millimetre?
ASTM B127 uses millimetres or inches. Gauge numbers still appear on older drawings; the gauge-to-mm table on this page converts them, with 8.8 g/cm³ weights for 400.
Can I order Monel 400 sheet cut to size?
Yes. Send finished sizes and quantities, or a drawing; we quote cut pieces as well as full sheets. Tell us if edges must be deburred or protected.
Sheet, strip or coil — which should I order?
Sheet if you need flat pieces below 3/16" (4.76 mm) and at least 24" wide; strip if narrower; coil if you will slit, blank or roll-form the material on your own line.
What is the minimum order for sheet?
There is no fixed minimum for stock sizes — single sheets and cut pieces are quoted. Mill orders for a non-stock thickness or finish carry the mill minimum.
Monel 400 or SS 316 / 316L — which should I choose?
Monel 400 is chosen for seawater, hydrofluoric acid and marine service. SS 316 / 316L is the step up when you need more pitting resistance or strength. See the comparison table on this page, or ask us with your process conditions.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026