Marine resistance
Useful resistance in flowing seawater and established use in pumps, valves, shafts and fasteners.
Nickel-copper solid-solution alloy
Monel 400 Plate, Sheet and Round Bar
A tough nickel-copper alloy used in marine, chemical and heat-exchanger equipment for corrosion resistance across a wide temperature range.
Representative product-form image. Confirm actual surface, dimensions and condition with the quotation.Material overview
Why industrial buyers specify Monel 400
Alloy 400 is a single-phase solid-solution nickel-copper alloy that can be strengthened by cold work. It is valued for toughness, seawater service and resistance to many reducing media. Some heats may be magnetic at room temperature, so magnetic requirements should be stated.
Low-temperature toughness
Maintains toughness without a ductile-to-brittle transition at very low temperatures.
Chemical service
Used in selected reducing media, process vessels, piping and heat-transfer equipment.
Technical reference
Composition and purchasing data
Values below are published reference limits. The purchase order, applicable specification and mill test certificate control the supplied material.
Limiting chemical composition, weight %
| Element | Published limit |
|---|---|
| Nickel + cobalt | 63.0 min |
| Copper | 28.0-34.0 |
| Iron | 2.5 max |
| Manganese | 2.0 max |
| Silicon | 0.5 max |
| Carbon | 0.3 max |
| Sulfur | 0.024 max |
Key material facts
- Designation
- UNS N04400; W.Nr. 2.4360 / 2.4361
- Density
- 8.80 g/cm3
- Strengthening
- Solid-solution alloy; higher strength is obtained by cold working.
- Temperature note
- Retains toughness at sub-zero temperature; corrosion and strength limits depend on medium, velocity, stress and condition.
- Common supply
- Plate, sheet, strip, round bar, flat bar, wire and cut blanks
Technical reference: manufacturer technical bulletin. Typical data is for material selection only and is not a design guarantee.
Common specifications
Standards buyers frequently reference
Specification editions and permitted product forms change. Send the exact standard, revision and condition shown on your drawing or material list.
| Product or requirement | Common reference |
|---|---|
| Plate, sheet and strip | ASTM B127 |
| Rod, bar and wire | ASTM B164 |
| Seamless pipe and tube | ASTM B165 |
| Forgings and fittings | ASTM B564 |
Availability is subject to grade, size, quantity, condition, certification and mill route. No standard listed here confirms stock.
Application areas
Where Monel 400 is commonly evaluated
Final material selection belongs to the buyer's qualified engineer and must consider temperature, stress, fabrication, corrosion medium and governing code.
Marine equipment
Pumps, valves, propeller shafts, fixtures and fasteners.
Chemical processing
Process vessels, piping, evaporators and acid-handling equipment.
Heat exchangers
Boiler feedwater heaters, deaerating heaters and condenser components.
Electrical components
Springs and electrical or electronic parts requiring corrosion resistance.
RFQ checklist
Information needed for an accurate quotation
Clear specifications shorten material matching and reduce repeated email clarification.
1. Grade and standard
Monel 400, UNS N04400, ASTM/AMS/EN standard and required revision.
2. Product and dimensions
Plate, sheet, strip, round bar, flat bar, wire and cut blanks. Include thickness, width, length, diameter and tolerances.
3. Condition
Annealed, hot-finished or cold-worked condition according to required properties
4. Quantity
Pieces, kilograms or total project quantity, plus any trial-order requirement.
5. Inspection
MTC type, chemistry, mechanical tests, NDT, dimensional report and third-party inspection.
6. Delivery
Destination country or port, required date, packing and Incoterm preference.
Fast alloy inquiry
Send your Monel 400 size, quantity and destination.
We will review product form, specification, condition, certification and delivery requirements before preparing a targeted quotation.
Buyer questions
Monel 400 FAQ
Quick answers for initial sourcing. Confirm critical engineering requirements against the governing specification.
Can Monel 400 be hardened by heat treatment?
No. Alloy 400 is a solid-solution alloy and is strengthened primarily by cold working.
Is Monel 400 always non-magnetic?
No. Its Curie temperature can fall near room temperature and magnetic response can vary by heat. State any strict magnetic requirement.
Why is Monel 400 used in marine equipment?
It combines toughness with resistance to many seawater conditions, particularly in flowing service, but velocity and stagnant-water conditions still matter.
Related grades
Compare other core alloy pages
Use related pages to compare alloy families before sending your final material requirement.