Copper-Nickel Wrought Alloy (UNS C72800)

Jul 24 2013

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications

Introduction

There are over 400 copper alloys available in the market today, each with its own unique properties, designed to match specific applications, manufacturing methods, and environments. UNS C72800 is a copper-nickel wrought alloy with very good corrosion resistance especially in seawater.

The following datasheet discusses the chemical composition and properties of copper UNS C72800.

Chemical Composition

The chemical composition of UNS C72800 copper alloy is outlined in the following table.

Element Content (%)
Nickel, Ni 9.5-10.5
Tin, Sn 7.5-8.5
Zinc, Zn 1
Iron, Fe 0.5
Niobium, Nb 0.10-0.30
Aluminum, Al 0.1
Manganese, Mn 0.05-0.30
Silicon, Si 0.05
Antimony, Sb 0.02
Titanium, Ti 0.01
Magnesium, Mg 0.005-0.15
Lead, Pb 0.005
Phosphorus, P 0.005
Boron, B 0.001
Bismuth, Bi 0.001
Sulfur, S 0.0025
Copper, Cu Balance

Physical Properties

The following table discusses the physical properties of copper UNS C72800.

Properties Metric Imperial
Density 8.97 g/cm3 0.324 lb/in3
Melting point 916.7 - 1080 °C 1682 - 1980 °F

Mechanical Properties

The mechanical properties of copper UNS C72800 are tabulated below.

Properties Metric Imperial
Tensile strength 524 MPa 76000 ksi
Yield strength (annealed) 248 MPa 36000 ksi
Poisson’s ratio 0.35 0.35
Shear Modulus 47.2 GPa 6840 ksi
Elongation 8% 8%
Hardness, Rockwell C 39.5 39.5
Machinability 10 10

Thermal Properties

The thermal properties of copper UNS C72800 are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (at 20-200°C/68-392°F) 13.5 µm/m°C 7.50 µin/in°F
Thermal conductivity 54.8 W/mK 380 BTU in/hr.ft².°F

Applications

Copper UNS C72800 finds application in:

  • Springs
  • Electrical contacts
  • Relay elements
  • Marine components.

 

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