Cupronickel - Copper Nickel Alloy UNS C71640

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

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.

The following datasheet will provide more details about the UNS C71640 copper nickel (cupronickel) alloy.

Chemical Composition

The following table shows the chemical composition of the UNS C71640 cupronickel-copper nickel alloy.

Element Content (%)
Copper, Cu 62.15-67.8
Iron, Fe 1.70-2.30
Lead, Pb 0.050
Manganese, Mn 1.50-2.50
Nickel, Ni 29.0-32.0
Zinc, Zn 29.0-32.0

Physical Properties

The physical properties of UNS C71640 copper nickel alloy are outlined in the following table.

Properties Metric Imperial
Density 8.86 g/cm3 0.320 lb/in3

Mechanical Properties

The mechanical properties of UNS C71640 cupronickel alloy are tabulated below.

Properties Metric Imperial
Tensile strength (annealed) 434 MPa 63000 psi
Tensile strength (hard drawn-H80 for tubing / rolled-H04 for flat products) 538 MPa 81000 psi
Yield strength (annealed) 172 MPa 25000 psi
Yield strength (hard drawn-H80 for tubing / rolled-H04 for flat products) 400 MPa 58000 psi
Elongation at break (hard drawn-H80 for tubing / rolled-H04 for flat products) 4.00% 4.00%
Elongation at break (annealed) 40.00% 40.00%
Elastic modulus (C71500 annealed) 152 GPa 22000 ksi
Poisson’s ratio (C71500 annealed) 0.325 0.325
Machinability (based on free-cutting brass = 100) 20 20
Shear modulus (C71500 annealed) 57.2 GPa 8300 ksi

Thermal Properties

The thermal properties of UNS C71640 copper nickel 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 29.4 W/mK 204 BTU in/hr.ft².°F

Other Designations

Equivalent materials to the UNS C71640 copper nickel alloy are:

  • ASTM B111
  • ASTM B543
  • ASTM B552

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