Copper Alloys


NIBRON SPECIAL® is the flagship of Columbia Metals’ alloy range. It is a superb engineering material, specially developed to provide a combination of high performance engineering properties not found in any other alloy. It is one of the highest strength copper alloys available with good levels of ductility. This, together with its excellent corrosion resistance in both marine environments and a large range of aggressive industrial media, has resulted in NIBRON SPECIAL® becoming the material of choice in many demanding applications.

NIBRON SPECIAL® is resistant to hydrogen embrittlement, stress corrosion cracking and both pitting and crevice attack. The alloy retains a useful level of strength up to temperatures of around 250oC and is not prone to embrittlement at sub-zero temperatures. It offers high wear resistance and exhibits good anti-galling characteristics in many applications.

Although it is harder than normal bronzes, NIBRON SPECIAL® is readily machinable and is used in a wide variety of demanding applications. These include high strength bolting and critical subsea components employed in aggressive offshore environments, hydraulic components, landing gear bushes and many other critical engineering components.

Related Specifications of NIBRON SPECIAL®

  • DTD 900/4805
  • C72400
  • 2.1504
  • CuNi14Al3

Nominal Composition of NIBRON SPECIAL®

Cu rem, Ni 14.5%, Mn 0.3%, Al 3.0%, Fe 1.5%

Mechanical Properties of NIBRON SPECIAL®

Ultimate Tensile Strength (N/mm²) Proof Stress (N/mm²) Elongation (%) Hardness (HB)
770-850 555-630 12 229-240

Key Features of NIBRON SPECIAL®

  • Very high mechanical properties
  • Excellent wear and galling resistance
  • High ductility
  • Outstanding resistance to marine corrosion and erosion
  • Retention of properties at cryogenic temperatures
  • Exceptionally low magnetic permeability
  • Good machinability and dimensional stability
  • Good thermal conductivity

Applications of NIBRON SPECIAL®

Offshore & marine | Marine shafts and bearing bushes, offshore bolting, valve and pump trim

Aerospace | Aircraft landing gear bushes, actuating sleeves, steering gear, bearing bushes, non-magnetic bolts and control surface components

Automotive | High performance engine shafts, gears, pinions, bearing bushes, locking nuts, mechanical and electromechanical components, thrust washers and hydraulic equipment

Chemical processing | Pump and valve spindles and other trim, flanges, pipe fittings, clamps and plant components

Case Study

NIBRON SPECIAL®: gate valve override stems

Technical Information

Columbia Metals has commissioned a wide range of chemical and mechanical testing of NIBRON SPECIAL® to provide design engineers with confidence in its suitability for a wide range of applications and environments.

The following technical reports are currently available:

NIBRON SPECIAL® design guide
This guide features technical data and discussion of the mechanical performance of Nibron under a range of operating conditions

This report assesses the weldability of NIBRON SPECIAL® to itself and to other materials

Columbia Metals – a leading supplier of NIBRON SPECIAL®

With decades of experience and a huge range of stock, Columbia Metals is an industry leader in the supply of NIBRON SPECIAL® and other high quality specialist engineering alloys.

To buy or learn more about NIBRON SPECIAL® contact us now, or fill in the enquiry form on the right hand side and we will be in touch shortly.

  Related Specifications Mechanical Properties
Alloy Name BS UNS BS EN Others Ultimate Tensile Strength N/mm² Minimum Yield Strength N/mm² Elongation % Hardness HB  
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