Material : Cupro-Nickel

Copper Nickel 90/10

90/10 cupronickel is a 90% copper, 10% nickel alloy that also contains small but important additions of iron and manganese to enhance overall strength corrosion resistance. This, combined with high ductility and toughness, makes it a popular grade for marine, architectural and industrial applications.

90/10 alloy offers designers and specifiers excellent resistance to stress corrosion, erosion, and biofouling in seawater and brackish water, excellent fabrication and welding properties, a high resistance to hydrogen embrittlement and the retention of mechanical properties down to cryogenic temperatures.

The material is released to the Defence Standard DEF STAN 02-879 Annex C, which supersedes both DEF STAN 02-779 and NES 779.

The most popular specifications in Europe and America are C70600, CN102 and CW352. These grades are most commonly specified within the marine, offshore, chemical, petrochemical and shipbuilding industries and are also widely used for handling seawater in all types of heat exchanger and cooling plant.

90/10 has undergone tests that indicate it has excellent antimicrobial properties. It is capable of killing 99.9% of a wide range of organisms within two hours, including MRSA, E.coli, influenza A (H1N1) and clostridium difficile. This has created a higher demand for the alloy in application areas such as hygienic and sanitary environments in hospitals, kitchens, nursing homes and other healthcare environments.

Related Specifications

  • CN102
  • C70600
  • C70610
  • CW352H
  • DEF STAN 02-879 Annex C
  • DEF STAN 02-779
  • NES 779
  • BS2870
  • BS2874
  • ASTM B151
  • EN 12163
  • 2.0872
  • NF A51-115
  • CuNi10Fe1Mn

Nominal Composition

Cu rem, Ni 10.0%, Fe 1.5%, Mn 0.7%

Mechanical Properties

Ultimate Tensile Strength (N/mm²) Proof Stress (N/mm²) Elongation (%) Hardness (HB)
280 105 27 70-120

Key Features

  • 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


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

Other | Power steering tube, brake lines, condenser plates, pressure vessels and distiller tubes

Related Specifications Mechanical Properties
Alloy Name BS UNS BS EN Others Ultimate Tensile Strength N/mm² Minimum Yield Strength N/mm² Elongation % Hardness HB
Co­pp­er Ni­ck­el 90­/1­0 CN­10­2 C7­06­00­; C7­06­10 CW­35­2H 2.­08­72 28­0 10­5 27 70-12­0
Co­pp­er Ni­ck­el 70­/3­0 / NE­S 78­0 CN­10­7 C7­15­00­; C7­15­20 CW­35­4H NE­S7­80 31­0 27 80-12­0
DE­F ST­AN 02-83­5 C7­24­20 DG­S3­57 71­0-72­5 40­0-43­0 18-22
NI­BR­ON SP­EC­IA­L® DT­D9­00­/4­80­5 C7­24­00 2.­15­04 77­0-85­0 55­5-63­0 12 22­9-24­0
DT­D4­98 / BS­B2­5 DT­D4­98 C6­47­00 CW­11­1C BS­B2­5 58­0 43­0 18 15­9-20­7H­V
CO­LS­IB­RO­® DT­D4­98 C6­47­00­; C1­80­00 CW­11­1C 2.­08­55 55­0-64­0 43­0-59­0 10 15­5-18­0
TR­OJ­AN C7­02­50­; C7­02­52 CW­11­2C 2.­08­57 69­0-80­0 57­0-75­0 10 19­0-20­0
BE­CO­L-25 CB­10­1 C1­72­00 CW­10­1C AS­TM B1­96­; CD­A 17­20­0
CH­RO­MZ­IR­C-3 CC­10­1 C1­82­00 CW­10­5C BS 45­77 A/­2/­1 45­0 40­0 20 14­0H­V
CH­RO­MZ­IR­C-32­8 CC­10­2 C1­81­50 CW­10­6C BS­45­77 A/­2/­2; IS­O5­18­2 45­0 40­0 20 14­0H­V
CO­LD­UR-A® CS­10­1 C6­55­00­; C6­56­00 CW­11­6C AS­TM B9­8; AS­TM B2­49 48­5 26­0 20
CO­LD­UR-B C6­51­00 CW­11­5C AS­TM B9­8 48­5 26­0 20