High Copper Alloy (UNS C81100)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication
Applications

Introduction

UNS designations C80000 to C81200 indicate cast copper alloys. UNS C81100 is a high copper alloy. Casting methods such as centrifugal, sand, continuous, permanent mold, investment, and plaster are recommended for this alloy.

The following datasheet discusses the chemical composition and properties of copper UNS C81100.

Chemical Composition

The chemical composition of copper UNS C81100 is given in the following table.

Element Content (%)
Copper, Cu + Silver, Ag 99.70 min
Others 0.30 max

Physical Properties

The following table discusses the physical properties of copper UNS C81100.

Properties Metric Imperial
Density 8.8-8.94 g/cm3 0.317- 0.322 lb/in3
Melting point 1065 - 1083 °C 1949 - 1981 °F

Mechanical Properties

The mechanical properties of copper UNS C81100 are tabulated below.

Properties Metric Imperial
Tensile strength 170 MPa 24700 psi
Yield strength 62 MPa 8990 ksi
Modulus of elasticity 117 GPa 16969 ksi
Poisson’s ratio 0.34 0.34
Elongation at break 40% 40%
Hardness, Brinell 44 44
Machinability 10 10

Thermal Properties

The thermal properties of copper UNS C81100 are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (at 20-300°C/68-572°F) 16.9 µm/m°C 9.39 µin/in°F
Thermal conductivity (at 20°C/68°F) 346 W/mK 2400 BTU in/hr.ft².°F

Fabrication

Soldering and brazing are considered as excellent welding options for copper UNS C81100. Oxyacetylene welding and coated metal arc welding are not recommended.

Applications

Copper UNS C81100 finds use in:

  • Electrical and thermal conductors
  • Bus conductor components
  • Corrosion and oxidation resistant applications.

 

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