🌊 What Do Submarines, Heat Exchangers & Luxury Yachts Have in Common?

They all rely on advanced materials built to perform under extreme pressure and in corrosive environments.

DOMADIA™ CuNi30Fe2Mn2, identified by UNS C71640 / DIN 2.0883, is one such material. Widely trusted across the marine, energy, and industrial sectors, this copper-nickel alloy offers exceptional resistance to seawater corrosion, mechanical stress, and long-term degradation. While it often works silently in the background, it plays a crucial role in safeguarding system integrity, extending service life, and ensuring high performance even under the harshest conditions.

Chemical Composition

The CuNi30Fe2Mn2 alloy features a finely tuned mix of:

As a result, this balanced composition delivers excellent corrosion resistance, particularly in saltwater environments.

Properties

PropertyValue
Density8.95 g/cm³
Melting Point1170–1240 °C
Electrical Conductivity~4–7% IACS
Tensile Strength350–550 MPa (annealed to cold-worked)
Yield StrengthUp to 250 MPa
ElongationUp to 30%
Magnetic PermeabilityLow (non-magnetic in annealed state)
Key Feature: Exceptional resistance to biofouling, stress corrosion cracking, and impingement attacks in high-velocity seawater.

Applications

Thanks to this powerful blend of corrosion resistance and mechanical strength, DOMADIA™ CuNi30Fe2Mn2 earns its place in a wide range of demanding applications.

  • Condenser Tubing
    Widely used in industrial systems and multi-stage flash desalination due to its durability.
  • Heat Exchangers
    Suitable for high-efficiency seawater cooling systems due to its heat transfer capability.
  • Seawater Piping
    Ideal for marine piping systems where resistance to marine corrosion and biofouling is critical.
  • Desalination Plants
    Performs reliably in brine heaters and heat rejection units where erosion corrosion is a concern.
  • Offshore Oil and Gas
    Used in offshore structures and pipelines for its strength and longevity in aggressive environments.
  • Marine Structures
    Common in shipbuilding, ship repair, boat hulls, and submerged components.
  • Chemical Industry
    Applied in chemical plants where corrosion resistance and strength are essential.

Standards & Technical Specifications

  • UNS C71640
  • DIN 2.0883
  • Standard: DIN 17664
  • Forming: Excellent
  • Welding ability: Good (TIG/MIG)
  • Hardness: Up to 150 HV (annealed)

Other Designations

Equivalent materials to the UNS C71640 copper nickel alloy are:

  • ASTM B111
  • ASTM B543
  • ASTM B552

Available Shapes & Forms

To suit your exact industrial need, DOMADIA™ CuNi30Fe2Mn2 is available in:

Each form is produced with strict adherence to DIN 17664 standards and ensures reliable machinability and long service life.

Why Choose DOMADIA™ CuNi30Fe2Mn2?

  • Long-term durability in aggressive marine environments
  • Excellent strength-to-corrosion performance ratio
  • Proven reliability across marine, chemical, and energy sectors
  • Flexible form availability to support diverse design needs

Conclusion

When it comes to seawater, pressure, and time, most metals tap out early. Not this one.
DOMADIA™ CuNi30Fe2Mn2 (UNS C71640) handles the harsh stuff—literally and chemically—without breaking a sweat.
From brine heaters to oil rigs, it’s built to outlast and outperform.

✅ If you’re tired of corrosion headaches, it’s time to switch to an alloy that doesn’t just survive—it thrives.

Explore our full range of precision alloys and engineering materials at  https://domadia.net/

Talk to: Kairav Domadia | Aadil Domadia | Er.Pankaj Domadia | Pragati Sanap | Pooja N N | Shivani Kanojia