MONEL® 400
UNS N04400
Nickel-copper alloy with high corrosion resistance, especially suitable for marine environments, chemical industry, seawater, industrial components and made-to-drawing CNC machined parts.
A nickel-copper alloy for corrosive environments
MONEL® 400, also identified as UNS N04400, is a nickel-copper alloy used when corrosion resistance, good mechanical strength and reliable behaviour in aggressive environments are required.
Its chemical combination makes it especially interesting for marine applications, chemical process equipment, valves, pumps, shafts, special fasteners and machined components where common stainless steels may not provide enough durability.
Material identification
What is MONEL® 400?
It is a nickel-based alloy with a significant copper content, developed to provide corrosion resistance in media where other materials may degrade quickly.
Unlike many stainless steels, MONEL® 400 does not rely on a high chromium content for its corrosion behaviour. Its nickel-copper base allows it to work in seawater, saline media, reducing environments and certain chemical processes.
Nickel-copper base
Technical alloy designed for corrosive environments and demanding industrial applications.
Marine environment
Widely used in seawater, naval systems, pumps, valves and coastal components.
Good strength
Combines mechanical strength with stable service behaviour.
Made-to-drawing parts
Suitable for shafts, bushings, special fasteners, washers, nuts and CNC components.
Why it is used in difficult environments
MONEL® 400 is selected when the part needs to resist corrosion, seawater, certain chemical media and service conditions where material reliability is critical.
| Property | Technical advantage |
|---|---|
| Corrosion resistance | Good behaviour in seawater, saline media and certain chemical environments. |
| Nickel-copper base | Metallurgical combination that provides stability and resistance in aggressive media. |
| Good mechanical strength | Allows the manufacture of parts subjected to load, pressure, adjustment or functional wear. |
| Marine service | Interesting for naval, offshore, pump, valve and saltwater system components. |
| Weldability | Can be used in fabricated assemblies, always under a suitable procedure. |
| Technical machining | Requires suitable cutting strategy, cooling and tool control. |
An alloy dominated by nickel and copper
The behaviour of MONEL® 400 is mainly based on its nickel and copper content, with small amounts of iron, manganese, carbon and other residual elements.
This composition gives it very interesting resistance against certain corrosive media, while maintaining useful mechanical properties for industrial machined parts.
Approximate composition
Typical mechanical properties
Values may vary depending on standard, supply condition, treatment, diameter, material format and heat certificate.
Tensile strength
Yield strength
Elongation
Approximate hardness
Where MONEL® 400 is used
This alloy appears in sectors where corrosion, seawater, chemical media and component durability are decisive factors.
Marine industry
Offshore
Pumps and valves
Chemical processing
Heat exchangers
Special fasteners
Shafts and bushings
Made-to-drawing parts
CNC machining of MONEL® 400
Machining MONEL® 400 requires a suitable cutting strategy, thermal control, cooling, rigidity and correct tool selection.
At AREM-CNC, we manufacture parts in special alloys from drawings, physical samples or technical specifications, adapting the process to the material, geometry, tolerances, finish and documentation required by the customer.
Made-to-drawing production
- Special screws in MONEL® 400.
- Nuts, washers and technical fasteners.
- Shafts, pins, bushings and spacers.
- Components for pumps, valves and marine systems.
- Parts for chemical industry and corrosive environments.
- Manufacturing according to drawing, sample or specification.
Common material references
MONEL® 400 may appear in drawings, certificates and technical orders under different equivalent or related designations.
Technical documentation for special materials
In materials such as MONEL® 400, traceability is essential to verify composition, heat number, certificate, equivalence and material suitability for the final application.
Depending on the project, we can work with material certificates, heat numbers, technical drawings, tolerances, dimensional control, surface finish and final documentation associated with manufacturing.
Frequently asked questions about MONEL® 400
What is MONEL® 400?
It is a nickel-copper alloy identified as UNS N04400, used for its corrosion resistance in marine, chemical and industrial environments.
Where is MONEL® 400 used?
It is used in marine industry, offshore, pumps, valves, heat exchangers, special fasteners, shafts, bushings and components for corrosive environments.
Can MONEL® 400 be machined?
Yes. It can be machined using CNC processes, although it requires proper tool control, cooling, rigidity, feed rate and cutting strategy.
What is the difference between MONEL® 400 and MONEL® K-500?
MONEL® 400 is a solid-solution nickel-copper alloy. MONEL® K-500 belongs to the same family, but it can be precipitation hardened to achieve higher strength and hardness.
Does AREM-CNC manufacture made-to-drawing parts in MONEL® 400?
Yes. We can study parts from drawings, samples or technical specifications, reviewing geometry, tolerances, material, finish and required documentation.
Do you need parts manufactured in MONEL® 400?
Send us your drawing, physical sample or technical specification. We will review material, tolerances, geometry, finish and required documentation to manufacture a precise, reliable and traceable solution.