Copper-Nickel
Navinic · Hardibron® · ARCAP® AP4 · UNS C70600, C71500 · CuNi10Fe1Mn, CuNi30Mn1Fe, CuNi14Al3Fe1
Copper-nickel alloys are made for parts that must resist seawater corrosion for decades, from piping to high-load shafts.
Alloy family
What this family is good at
Corrosion resistance that lasts at sea
Copper-nickel alloys keep their surface intact in seawater and other aggressive media. They equip seawater piping, cooling circuits, fire-fighting systems, heat exchangers and condensers on frigates and submarines. The family also includes bar grades that add high strength, and strip grades chosen for their electrical resistance.
Navinic 10 and Navinic 30, our 90/10 and 70/30 cupronickels
Navinic 10 (CuNi10Fe1Mn, UNS C70600) and Navinic 30 (CuNi30Mn1Fe, UNS C71500) are our cupronickels for seawater circuits. Both are weldable and ductile, supplied as bars and tubes, annealed or cold worked. They are compliant with ASTM B466, BS 2871 and BS 2874, and Navinic 30 also with ASTM B171 and MIL C 15726.
Hardibron®, K5, K5B and K7 for high loads
Our copper-nickel-aluminium bars add strength, wear resistance and a strictly non-magnetic behaviour to the corrosion resistance of the family. Hardibron® (CuNi14Al3Fe1) goes into shafts, bearing bushes, valves, pumps and wellhead equipment for offshore, subsea and onshore oil and gas systems. Its bars are supplied with a guaranteed minimum tensile strength of 780 MPa and a hardness of 240 HB.
K5 (CuNi14Al2, CuNi14Al3) serves aerospace parts that need fatigue resistance without magnetism, and is compliant with ASNA 6127 and NFL 14702. K5B (CuNi14Mn4Al2) and K7 (CuNi14Al3Fe1) complete the range for defence and aerospace.
Grades for electrical resistance, cryogenics and machining
Constantan 45 (CuNi44Mn1Fe) is a strip for electrical resistance parts, with stable resistance as temperature changes. ARCAP® AP4 (Cu55Ni44Mn1) is strictly non-magnetic, retains its properties at cryogenic temperatures and offers good machinability in rod, strip and wire forms. C97 and C98 are leaded grades for machined parts that carry current.
How we work with you
Our engineers help you choose the grade and the temper for your part, then we produce it in the form you need. Every delivery comes with full traceability.
Navinic 10 and Navinic 30 resist seawater corrosion in piping, cooling and fire-fighting circuits.
Hardibron®, K5, K5B and K7 bring strength, wear resistance and non-magnetism to shafts, valves and aerospace parts.
Constantan 45 and ARCAP® AP4 cover electrical resistance parts and non-magnetic cryogenic parts.
Bars, tubes, rods, strips and wires, supplied with full traceability.
Range at a glance
The extent of this family's measured properties across its active variants — a range, never a single figure.
110 – 640 MPa
42/79 measured
250 – 850 MPa
43/79 measured
1 – 35 %
49/79 measured
65 – 240 HB
31/79 measured
4 – 30 %IACS
42/79 measured
8.5 – 8.9 g/cm³
65/79 measured
23 – 245 W/m·K
65/79 measured
All Copper-Nickel references
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Family highlights
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Used in
- Aerospace
- Defence
- Electronics & Connectors
- emobility
- Luxury
- oil-gas
- Energy & Nuclear
Downloads
- CuNi Navinic® alloys, bars & hollow bars · catalogue extract (PDF, EN)
- Copper-nickel bronze alloys (K5, K7, Hardibron®), bars & hollow bars · catalogue extract (PDF, EN)
- CuNi sea-water resistant alloys, strips & sheets · catalogue extract (PDF, EN)
- CuNi electronic-grade alloys, strips & sheets · catalogue extract (PDF, EN)
- CuNi resistance alloys, strips & sheets · catalogue extract (PDF, EN)
- ARCAP® alloys, strips & sheets · catalogue extract (PDF, EN)
Specify it with an engineer
Tell us about your part and its environment
Send us the drawing, the medium the part works in and the grade you use today. We recommend the closest copper-nickel grade and the forms we can supply it in.