Cupronickel - Copper Nickel Alloy UNS C71500

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Welding
Hot Working
Cold Working
Annealing
Applications

Introduction

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.

Chemical Composition

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

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

Physical Properties

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

Mechanical Properties

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

Thermal Properties

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

Other Designations

Equivalent materials to UNS C71500 cupronickel alloy are:

ASME SB111 ASTM B111 ASTM B466 MIL C-15726
ASME SB171 ASTM B122 ASTM B543 MIL T-15005
ASME SB359 ASTM B151 ASTM B552 MIL T-16420
ASME SB395 ASTM B171 ASTM B608 MIL T-22214
ASME SB466 ASTM B359 ASTM F467 SAE J461
ASME SB467 ASTM B395 ASTM F468 SAE J463
ASME SB543 ASTM B432 DIN 2.0882

Fabrication and Heat Treatment

Machinability

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

Welding

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.

Hot Working

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).

Cold Working

The cold working capacity of UNS C71500 is good.

Annealing

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

Applications

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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