DEFSTAN 02-779 (NES779) Grade - Copper Alloys

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.

Range

Product Form	OD Range	Wall Thicknesses
Tube DEFSTAN 02-779	6mm - 159mm	Various
Tube Commercial ⁹⁰⁄₁₀	16mm - 219mm	Various

A range of ⁹⁰⁄₁₀ fittings are also available:

Concentric Reducers
Type S Inner Flanges
Outer Flanges
90^o Long Radius Elbows
45^o 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

Properties

Chemical Composition

Chemical Element	% Present
Manganese (Mn)	0.50 - 1.00
Nickel (Ni)	10.00 - 11.00
Copper (Cu)	86.00 - 88.50
Others (Total)	0.00 - 0.22
Iron (Fe)	Balance

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

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

Applications

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

Characteristics

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

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