Copper and Copper Alloys - NES 779 DEFSTAN 02-779

NES 779 DEFSTAN 02-779

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

Chemical Composition



Chemical Element % Present
Iron (Fe) 1.00 max
Manganese (Mn) 0.50 - 1.00
Nickel (Ni) 10.00 - 11.00
Others (Total) 0.0 - 0.22
Copper (Cu) Balance


Physical PropertyValue
Density 890 g/cm³
Thermal Conductivity 49.0 W/m.K
Melting Point 1100-1145 °C



Mechanical PropertyValue
Elongation A50 mm 30 %
Proof Stress 120 MPa
Tensile Strength 280 MPa

Alloy Designations

UNS N05500 : BS 3076 NA18 : ASTM B865

Supplied Forms

  • Sheet
  • Bar
  • Plate
  • Rod
  • Forgings
  • Pipe
  • Castings
  • Fittings & Flanges
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Datasheet Search

Last Datasheet Revision

22 July 2016


This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.

Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied.

Advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. All transactions are subject to the Company’s current Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.