Cupronickel Series
Cupronickel Series
Cupronickel Series
Cupronickel Series
Cupronickel Series
Cupronickel Series
Cupronickel Series
Cupronickel Series

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
Classification China Germany America Japan England Europe International
oxygen free copper TU1 2.0076 C10200 C1020R C103
TU2 Cu-OF-H110 C11000 c1011 C101
Vacuum oxygen free copper E-Cu58 TU00 c1020 6N
high purity copper-OFE c10500 c10700
Silver copper TAg 0.1 CuAg 0.1 C10400 C1040 CuAg 0.1
brass H90 CuZn10 C22000 C2200 CZ101 CuZn10 CW501L
H70 CuZn30 C26000 C2600 CZ106 CuZn30 CW505L
H68 C26200 C2620 CuZn33 CW506L
H65 CuZn35 C27000 C2700 CZ107 CuZn36 CW507L
H63 CuZn37 C27200 C2720 CZ108 CuZn37 CW508L
H62 CuZn40 C28000 C2800 CZ109 CW509L
bronze QSn4-0.3 CuSn4 C51100 C5111 PB101 CuSn4 CW450K
CuSn5 C51000 C5101 CuSn5 CW451K
QSn6.5-0.1 CuSn6 C51900 C5191 PB103 CuSn6 CW452K
QSn8-0.3 CuSn8 C52100 C5210 CuSn8 CW453K
copper-nickel BZn18-18 CuNi18Zn20 C75200 C7521 NS106 CuNi18Zn20
BZn18-26 CuNi18Zn27 C77000 C7701 NS107 CuNi18Zn27 CW410J
BZn15-20 C7541 CW409J
BZn18-10 C7350
pure copper TU2 OF-Cu58 C10100 C1011 C101 CW008A copper oxide
T2 SW——copper C11000 C1100 C101 copper - FRHC
TP2 SF-Cu C12200 C1220 C106 CW024A copper - DHP
TP1 SW-copper C12000 C1201 CW023A copper DLP
Properties of some Cu–Ni alloys
Alloy Density
Thermal conductivity
Electrical resistivity
Elastic modulus
Yield strength
Tensile strength
90–10 8.9 40 17 19 135 105 275
70–30 8.95 29 16 34 152 125 360
66–30–2–2 8.86 25 15.5 50 156 170 435
UNS standard compositions* of wrought alloys (in at%). Maximum or range.
Alloy UNS No. Common name European spec Ni Fe Mn Cu
C70600 90–10 CuNi10Fe 9–11 1–1.8 1 Balance
C71500 70–30 CuNi30Fe 29–33 0.4–1.0 1 Balance
C71640 66–30–2–2 29–32 1.7–2.3 1.5–2.5 Balance

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.


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.