Cupronickel - Copper Nickel Alloy UNS C71500

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Copper-nickel alloys have very good resistance to biofouling and marine corrosion, and possess good fabricability. Copper gains more strength and corrosion resistance when nickel is added to it.

UNS C71500 copper-nickel (cupronickel) alloy has medium high strength and good creep resistance at high temperatures. This alloy is expensive in comparison with copper-aluminum alloys and other alloys with similar mechanical properties.

The following datasheet will provide more details about the UNS C71500 cupronickel-copper nickel alloy.

The following table shows the chemical composition of UNS C71500 cupronickel alloy.

Element	Content (%)
Copper, Cu	70
Nickel, Ni	30

The physical properties of UNS C71500 cupronickel alloy are outlined in the following table.

Properties	Metric	Imperial
Density	8.94 g/cm3	0.323 lb/in3
Melting point	1171°C	2140°F

The mechanical properties of UNS C71500 cupronickel alloy are tabulated below.

Properties	Metric	Imperial
Tensile strength	372-517 MPa	54000-75000 psi
Yield strength (depending on temper)	88.0-483 MPa	12800-70100 psi
Elongation at break (in 381 mm)	45%	45%
Elastic modulus	117 GPa	17000 ksi
Poisson's ratio	0.34	0.34
Machinability (UNS C36000 (free-cutting brass) = 100)	20	20
Shear modulus	57.0 GPa	8270 ksi

The thermal properties of UNS C71500 cupronickel alloy are tabulated below.

Properties	Metric	Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F)	16.2 µm/m°C	9 µin/in°F
Thermal conductivity (@20°C/ 68°F )	29 W/mK	201 BTU in/hr.ft².°F

The machinability rate of UNS C71500 cupronickel nickel alloy is 20.

Soldering, brazing, oxyacetylene welding, gas shielded arc welding, coated metal arc welding, spot welding, seam welding, and butt welding are considered as suitable welding processes for UNS C71500 alloy.

The hot working capacity of UNS C71500 copper nickel alloy is rated as good with the suitable hot working temperature being between 927 and 1038°C (1700 and 1900°F).

The cold working capacity of UNS C71500 is good.

The annealing temperature of UNS C71500 copper nickel alloy is between 649 and 816°C (1200 and 1500°F).

 The UNS C71500 cupronickel alloy is primarily used in seawater operations requiring forged and machined pump and valve components, hardware and fittings. This alloy can also be widely used in areas requiring high corrosion resistance, and where chloride stress-corrosion cracking precautions prevent usage of stainless steels.

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