Copper Alloys, Copper-Nickel (Cupro-Nickel)DEFSTAN 02-879 (NES879)

A 70% copper, 30% nickel alloy with additions of iron and manganese.

Copper nickel 70/30 is stronger than the more common copper nickel 90/10 and is able to withstand corrosion at higher velocities in marine applications, making it the favourable choice in submarine systems.

In particular, its corrosion resistance is notably improved in high-velocity waters (up to 4.5m/s) and polluted seawater.

Righton Blackburns carries the UK's largest range of product in this alloy.

Talk to an expertDownload PDF


Product FormSize Range
Round Bar DEFSTAN 02-78087925mm - 230mm
If you do not see what you are looking for, please contact your local service centre with your specific requirements.

Related Specifications

70/30- NES 780/DEFSTAN 02‐780

  • C71500
  • CN107
  • CuNi30
  • DEFSTAN 02‐879 Pt 2


Chemical Composition


  • Salt water flanges, salt water piping and pipe fittings, valve bodies, sea water intakes, pipe
  • fittings, water boxes, propeller sleeves, pump bodies and parts
  • Marine hardware
  • Heat exchangers
  • Condensers
  • Desalination units
  • Evaporator tubes, distiller tubes, refrigerator and condenser components
  • Flexible metal hose
  • Boiler parts
  • Pipework
  • Submarine components


  • Excellent corrosion and pitting resistance in marine environments
  • Good strength and toughness
  • Resistance to biofouling
  • Readily weldable and fabricated

Find your local Service Centre

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

RBL Truck Retouched