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K5B | CuNi14Mn4Al2 | NES 835

CuNi14Mn4Al2

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K5B | CuNi14Mn4Al2 | NES 835
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  • ISO composition : CuNi14Mn4Al2
  • Other norms :

    NES 835 
    DEFSTAN 02-835
    DOD‑C‑24676

Product forms

Bars & Hollow Bars

Forged and machined parts

Applications

Aerospace mechanical performance parts
Oil & Gas High Pressure High Temperature (HPHT) parts

K5B | CuNi14Mn4Al2 | NES 835 | DEFSTAN 02-835 key properties

K5B | CuNi14Mn4Al2 | NES 835 | DEFSTAN 02-835 is a wrought copper nickel aluminium alloy engineered for high strength applications in seawater environments, where reliable mechanical performance and resistance to aggressive conditions are required. Non magnetic by nature, K5B offers excellent resistance to mechanical wear, galling, stress relaxation, corrosion and erosion, making it suitable for demanding marine, defence and oil & gas service conditions. Compliant with DEFSTAN 02 835, K5B meets established defence material requirements for copper based alloys used in critical environments.

K5B | CuNi14Mn4Al2 | NES 835 | DEFSTAN 02-835 exhibits outstanding physical and mechanical properties, enabling reliable performance in components subjected to severe mechanical loading and corrosive exposure. Easily machinable into complex components, this alloy is both lead free and beryllium free, supporting environmentally responsible manufacturing while maintaining high performance. Referenced under DOD‑C‑24676, K5B is widely used in the oil & gas industry due to its high strength, durability, and resistance to harsh operating conditions.

As a wrought copper nickel aluminium alloy, K5B delivers a robust combination of mechanical strength, corrosion resistance and machinability, making it a dependable solution for critical offshore and subsea applications.
 

Designation
Available forms
Composition
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K5B
CuNi14Mn4Al2
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K5B | CuNi14Mn4Al2 | NES 835 | DEFSTAN 02-835 Applications

Marine and Defence
K5B | CuNi14Mn4Al2 | NES 835 | DEFSTAN 02-835 is used for fasteners for ships and submarines, control elements of submarines, pumps, shafts, mechanical seals, winch components, gears, hose couplings, sonar components, propeller shafts and drive bushings, where resistance to seawater corrosion, wear and erosion is critical.

Oil & Gas 
K5B | CuNi14Mn4Al2 | NES 835 | DEFSTAN 02-835 is applied in subsea bolting, pump and valve shafts, valve spindles, hydraulic pistons and cylinders, hydraulic connectors and pressure couplings, requiring high mechanical strength and long term reliability in aggressive offshore environments.