Copper Nickel Alloy UNS C71300

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
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.

The following datasheet will provide details about the UNS C71300 copper nickel alloy.

Chemical Composition

The following table shows the chemical composition of the UNS C71300 copper nickel alloys.

Element Content (%)
Cu 71.25-76.5
Fe ≤ 0.20
Pb ≤0.050
Mn ≤ 1.0
Ni 23.5-26.5
Zn ≤ 1.0

Physical Properties

The physical properties of UNS C71300copper nickel alloy are outlined in the following table.

Properties Metric Imperial
Density 8.94 g/cm3 0.323 lb/in³

Mechanical Properties

The mechanical properties of UNS C71300 copper nickel alloy are tabulated below.

Properties Metric Imperial
Hardness, Rockwell B (hard drawn-H80 for tubing / rolled-H04 for flat products) 69 69
Tensile strength (annealed) 359 MPa 52000 psi
Tensile strength (hard drawn-H80 for tubing / rolled-H04 for flat products) 538 MPa 78000 psi
Yield strength (annealed) 103 MPa 15000 psi
Elongation at break (hard drawn-H80 for tubing / rolled-H04 for flat products) 11.00% 11.00%
Elongation at break (annealed) 40% 40%
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 C71300 copper nickel alloy are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F) 16.2 µm/m°C 9.00 µin/in°F
Thermal conductivity 32.9 W/mK 0.0900 BTU in/hr.ft².°F

Applications

UNS C71300 copper nickel alloy is used in the following:

  • Fish cages used in for aquaculture
  • Offshore fire water systems
  • Heat exchangers and condensers
  • Hydraulic lines
  • Sheathing of legs and risers on boat hulls and offshore platforms
  • Sea water pipework
  • Desalination units

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