Cupronickel Series

Cupronickel or copper-nickel (CuNi) is an alloy of copper that contains nickel and strengthening elements, such as iron and manganese. The copper content typically varies from 60 to 90 percent. (Monel is a nickel-copper alloy that contains a minimum of 52 percent nickel.) Despite its high copper content, cupronickel is silver in colour. Cupronickel is highly resistant to corrosion by salt water, and is therefore used for piping, heat exchangers and condensers in seawater systems, as well as for marine hardware. It is sometimes used for the propellers, propeller shafts, and hulls of high-quality boats. Other uses include military equipment and chemical, petrochemical, and electrical industries.

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Grade list of copper and copper alloys by country
ClassificationChinaGermanyAmericaJapanEnglandEuropeInternational
oxygen free copperTU12.0076C10200C1020RC103
TU2Cu-OF-H110C11000c1011C101
Vacuum oxygen free copperE-Cu58TU00c10206N
high puritycopper-OFEc10500c10700
Silver copperTAg 0.1CuAg 0.1C10400C1040CuAg 0.1
brassH90CuZn10C22000C2200CZ101CuZn10CW501L
H70CuZn30C26000C2600CZ106CuZn30CW505L
H68C26200C2620CuZn33CW506L
H65CuZn35C27000C2700CZ107CuZn36CW507L
H63CuZn37C27200C2720CZ108CuZn37CW508L
H62CuZn40C28000C2800CZ109CW509L
bronzeQSn4-0.3CuSn4C51100C5111PB101CuSn4CW450K
CuSn5C51000C5101CuSn5CW451K
QSn6.5-0.1CuSn6C51900C5191PB103CuSn6CW452K
QSn8-0.3CuSn8C52100C5210CuSn8CW453K
QSn6.5-0.4
copper-nickelBZn18-18CuNi18Zn20C75200C7521NS106CuNi18Zn20
BZn18-26CuNi18Zn27C77000C7701NS107CuNi18Zn27CW410J
BZn15-20C7541CW409J
BZn18-10C7350
pure copperTU2OF-Cu58C10100C1011C101CW008Acopper oxide
T2SW——copperC11000C1100C101copper - FRHC
TP2SF-CuC12200C1220C106CW024Acopper - DHP
TP1SW-copperC12000C1201CW023Acopper DLP
Properties of some Cu–Ni alloys
AlloyDensity
g/cm3
Thermal conductivity
W/(m·K)
TEC
μm/(m·K)
Electrical resistivity
μOhm·mm
Elastic modulus
GPa
Yield strength
MPa
Tensile strength
MPa
90–108.9401719135105275
70–308.95291634152125360
66–30–2–28.862515.550156170435

Properties of some Cu–Ni alloys

UNS standard compositions* of wrought alloys (in at%). Maximum or range.
Alloy UNS No.Common nameEuropean specNiFeMnCu
C7060090–10CuNi10Fe9–111–1.81Balance
C7150070–30CuNi30Fe29–330.4–1.01Balance
C7164066–30–2–229–321.7–2.31.5–2.5Balance

UNS standard compositions* of wrought alloys (in at%). Maximum or range.

Marine engineering

Cupronickel alloys are used for marine applications due to their resistance to seawater corrosion, good fabricability, and their effectiveness in lowering macrofouling levels. Alloys ranging in composition from 90% Cu–10% Ni to 70% Cu–30% Ni are commonly specified in heat exchanger or condenser tubes in a wide variety of marine applications.

Coinage

The successful use of cupronickel in coinage is due to its corrosion resistance, electrical conductivity, durability, malleability, low allergy risk, ease of stamping, antimicrobial properties and recyclability.

Other usage

Single-core thermocouple cables use a single conductor pair of thermocouple conductors such as iron-constantan, copper constantan or nickel-chromium/nickel-aluminium. These have the heating element of constantan or nickel-chromium alloy within a sheath of copper, cupronickel or stainless steel.

Cupronickel is used in cryogenic applications. Its combination of good ductility retention and thermal conductivity at very low temperatures is advantageous for low-temperature processing and storage equipment as well as for heat exchangers at cryogenic plants.

For high-quality cylinder locks and locking systems, cylinder cores are made from wear-resistant cupronickel.

Email: [email protected]

Tel: 0086-021-57629806

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