Chromium Copper Alloy (UNS C18200)

Topics Covered

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

Introduction

UNS C18200 chromium copper alloys are primary alloys, which are heat treated and cold worked to provide electrical conductivity of 80% IACS and hardness. They are used in applications that require deformation resistance at high temperatures.

The following datasheet will discuss in detail about UNS C18200 chromium copper alloy.

Chemical Composition

The following table shows the chemical composition of UNS C18200 copper alloys.

Element Content (%)
Cu 99.1
Cr 0.9

Physical Properties

The physical properties of UNS C18200 copper alloys are given in the following table.

Properties Metric Imperial
Density 8.89 g/cm3 0.321 lb/in3
Melting point 1070°C 1958°F

Mechanical Properties

The mechanical properties of UNS C18200 copper alloys are tabulated below.

Properties Metric Imperial
Hardness, Rockwell B (50.8 - 76.2 mm/2.00 - 3.00 in) 65 65
Hardness, Rockwell B (25.4 - 50.8 mm/1.00 - 2.00 in) 70 70
Hardness, Rockwell B (≤25.4 mm/1.00 in, heat treated)  75.0  75.0
Tensile strength at break (any thickness)  379 MPa  55000 psi
Yield strength (0.500, any thickness)  379 MPa  55000 psi
Modulus of elasticity 117 GPa 17000 ksi
Poissons ratio 0.181 0.181
Shear modulus 49.6 GPa 7200 ksi

Thermal Properties

The thermal properties of UNS C18200 copper alloys are tabulated below.

Properties Metric Imperial
Thermal Conductivity (20.0°C/ 68.0°F) 323.4 W/mK 2244 BTU in/hr.ft².°F

Other Designations

Other designations that are equivalent to UNS C18200 copper alloys include:

  • ASTM F9
  • MIL C-19311

Fabrication and Heat Treatment

Machinability

The machinability rating of C18200 copper alloys is 20.

Welding

Welding methods such as soldering, brazing, seam welding and butt welding are preferred for C18200 copper alloys. Oxyacetylene welding, gas shielded arc welding, coated metal arc welding and spot welding are not preferred for this type of alloys.

Forging

C18200 copper alloys are forged at temperatures ranging from 760 to 871°C (1400 to 1600°F). The hot forgeability rating of these alloys is 80.

Hot Working

C18200 copper alloys have good hot working property.

Cold Working

C18200 copper alloys have excellent cold working property.

Applications

The following are the major applications of UNS C18200 copper alloys:

  • Tips
  • Clamps
  • Wheels
  • Electrical and mechanical power transmission devices
  • Circuit breaker parts
  • High-strength fasteners

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