Copper Alloys, Copper-Nickel (Cupro-Nickel)DEFSTAN 02-779 (NES779)

A copper-nickel alloy which contains 90% copper and 10% nickel and offers outstanding corrosion resistance.

Copper Nickel 90/10 is the most commonly used wrought copper alloy for marine engineering and can be found in seawater systems for naval, commercial shipping and the oil and gas markets due its good strength. corrosion resistance and inherent resistance to biofouling in salt water environments.

Righton Blackburns offers the full selection of products in this alloy, including pipe and fittings to cover all applications.

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Product FormOD RangeWall Thicknesses
Tube DEFSTAN 02-7796mm - 159mmVarious
Tube Commercial 901016mm - 219mmVarious

A range of 9010 fittings are also available:

  • Concentric Reducers
  • Type S Inner Flanges
  • Outer Flanges
  • 90o Long Radius Elbows
  • 45o Long Radius Elbows
  • Tee Pieces
If you do not see what you are looking for, please contact your local service centre with your specific requirements.

Related Specifications

  • UNS N05500
  • BS 3076 NA18
  • ASTM B865


Chemical Composition


  • Offshore & marine: Salt water pipes and fittings, hot water tanks, salt water baffles, propeller sleeves, valve and pump components, flanges, boat hulls, marine fittings and marine hardware
  • Chemical processing: Heat exchanger and cooling plant, evaporator tubes, pump and valve trim
  • Power steering tube
  • Brake lines
  • Condenser plates
  • Pressure vessels
  • Distiller tubes


  • High ductility and toughness
  • Excellent resistance to erosion and corrosion in seawater
  • Inherent resistance to biofouling
  • Excellent fabrication and welding properties
  • Retention of mechanical properties down to cryogenic temperatures

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An extensive UK network of Service Centres, backed up by a central distribution facility.

  • Experienced multi-product specialists

  • In-house state of the art processing facilities

  • Large fleet of bespoke delivery vehicles

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