UNS C63000 (AMS 4640)

UNS C63000 is a high-strength nickel aluminium bronze alloy providing outstanding corrosion resistance.

Including nickel in the alloying process strengthens the material without reducing toughness, ductility or corrosion resistance. UNS C63000 offers improved corrosion resistance in marine environments and better malleability than BS B23. The alloy also provides excellent abrasion, shock and wear resistance. Our product is ideal for subsea and above-sea applications and also finds extensive use in aerospace and naval sectors.


Typical commercial applications include:

  • Excellent corrosion resistance (particularly marine)
  • Excellent toughness
  • High strength
  • Excellent fatigue resistance
Impressive Performance

UNS C63000 retains its mechanical properties at elevated temperatures. The product also offers high-strength hardness, good toughness and fatigue strength and excellent wear, abrasion and shock resistance. The alloy finds typical use in marine applications along with the production of bushes and bearings.

Corrosion Resistance

The alloy provides excellent corrosion resistance in saltwater environments. It is, therefore, highly suitable for marine applications including piping and propulsion systems, marine fixtures and fittings. Good corrosion resistance is also possible in dilute hydrochloric, sulphuric and non-oxidising acids.


The material provides good machinability, good hot formability and good weldability. Oxyacetylene welding and soldering are not recommended. C63000 aluminium bronze is non-sparking, making it ideal for explosive environments.


We stock UNS C63000 aluminium bronze in round bars and plates.

UNS C63000
UNS C63000 Copper
UNS C63000 pdf
UNS C63000 Stock

Product Summary

Product UNS C63000
Type Nickel Aluminium Bronze
Availability Round bar and plate
Benefits Excellent corrosion resistance (particularly marine), excellent toughness high strength, excellent fatigue resistance
Applications Heat exchangers, pump components, marine fasteners, gear bushes
Datasheet UNS C63000 - Technical Datasheet
Reference Home/ Products/ Bronze Alloys/ UNS C63000

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