COPPER-NICKEL ALLOYS


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Copper-Nickel Alloys
Copper-Nickel Alloys
Copper-Nickel Alloys

Copper-nickel alloys (often referred to as cupro-nickels) offer moderate to high strength and excellent resistance to various waters, including seawater and form a protective surface film in such conditions. In addition they provide good anti-fouling properties and weldability.

The precipitation hardenable copper nickels (DEF STAN 02-835 and ULTIBRON™-NB) possess high strength and are used as an alternative to the 90/10 and 70/30 alloys and other copper alloys such as nickel aluminium bronze in marine applications. Other useful attributes include low magnetic permeability, imperviousness to hydrogen embrittlement, no loss of impact strength down to minus 196°C and good jet impingement resistance.

Applications for 90/10 and 70/30 alloys mainly involve tubes and tube plates in heat exchangers, including desalination and seawater piping systems. 70/30 alloy is also used for hose couplings, mechanical seals and pump shafts. Applications for the high strength cupro-nickels are varied and cover subsea bolting in Oil & Gas to hydraulic connectors and valve stems.

Usage in Naval vessels is widespread, for example, for bolting, propeller shafts, sonar components and weapons handling equipment. Copper-nickel alloys are also finding new applications replacing beryllium-copper alloys due to environmental difficulties in their manufacture.

Nearest Equivalent Specification

Available Products

CN102

A 90/10 copper-nickel alloy with excellent sea water corrosion and erosion resistance due to small additions of iron and manganese. It finds many applications in marine engineering due to its moderate strength and ability to be hot and cold worked. It is easily welded and exhibits good resistance to stress corrosion.

DEF STAN
NES
UNS
EN
ISO

02-779
779
C70600
CW352H
CuNi10Fe1Mn

CN107

A 70/30 copper-nickel with small additions of iron and manganese to improve resistance to high velocity seawater. Higher strength and better corrosion resistance compared with 90/10 alloy but slightly reduced anti-fouling properties. Good hot and cold working properties. It is easily welded and exhibits good resistance to stress corrosion.

DEF STAN
NES
UNS
EN
ISO

02-780
780
C71500
CW354H
CuNi30Mn1Fe

NES 835

An advanced precipitation-hardenable copper-nickel with improved mechanical properties over 90/30 and 70/30 alloys and aluminium bronzes. Excellent corrosion resistance and resistance to hydrogen embrittlement. Designed specifically for use in Oil & Gas, Marine and Naval applications, tensile strengths up to 750N/mm2.

DGS
DEF STAN
UNSI

357
02-835
C72420

ULTIBRON™-NB

A complex precipitation-hardenable copper-nickel with superior mechanical properties to DEF STAN 02-835 and most other copper nickel alloys. Excellent corrosion resistance and low magnetic permeability. Good machinability and weldability. Designed specifically for use in Oil & Gas, Marine and Naval applications, tensile strengths up to 850N/mm2.

DTD
DIN
UNS
ISO

900/4805
2.1504
C72400
Cu15Ni3Al

Other Copper Alloys
 

See Beryllium Copper, Brass Alloys, Bronze Alloys and Copper & Copper Alloys.