Chromium Copper

Chromium Copper
alloy grade CuCr
Micro Structure
Material No. UNS System (ASTM): C18200
Chemical Composition
Cu(1,2) Pb Fe Cr Si
Min (%) 0.6
Max (%) Rem 0.05 0.10 1.2 0.10
  1. Cu + Sum of Named Elements 99.5% min.
  2. Cu value includes Ag.

Mechanical Properties

Physical Properties

Melting Point – Liquidus °C 1075
Melting Point – Solidus °C 1070
Density lb/cu in. at 20°C 0.321
Specific Gravity 8.89
Electrical Conductivity% IACS at 20°C 80(1)
Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 20°C 187(2)
Coefficient of Thermal Expansion 20-100 10⁻⁶ per °C (20 – 100°C) 9.8
Specific Heat Capacity Btu/ lb /°F at 20°C 0.092
Modulus of Elasticity in Tension ksi 17000
Modulus of Rigidity ksi 7200
(1) Solution heat treated, cold worked (50% minimum) and aged.
(2) Solution heat treated, cold worked (50% minimum) and aged.

Thermal Properties

Treatment Minimum* Maximum* Value* Time** Medium
Solution Treatment 1000 1030 0.25 Air
Precipitation Treatment 460 3 Air
Hot Treatment 815.5556 926.6667
* Temperature is measured in Celsius. ** Time is measured in minutes.

Fabrication Properties

Technique Stability
Brazing Good
Butt Weld Fair
Capacity for Being Cold Worked Excellent
Capacity for Being Hot Formed Good
Coated Metal Arc Welding Not Recommended
Forgeability Rating 80
Gas Shielded Arc Welding Good
Machinability Rating 20
Oxyacetylene Welding Not Recommended
Seam Weld Not Recommended
Soldering Good
Spot Weld Not Recommended
General Fabrication Processes
  • Bending
  • Cold working
  • Drawing
  • Extruding
  • Forging
  • Hot working
  • Impacting
  • Ring Rolling
  • Machining

Applicable Form

Form Description
Rod Hot Extruded & Cold Drawn Copper Rod
Flat Hot Extruded & Cold Drawn Copper
Profile Hot Extruded & Cold Drawn Copper Cut to length
Wheel Forged & Machined
Tube Hot Extruded Tube & Machined
Block Forged & Machined

Typical Uses / Application

Product Category Product Reason
Electrical Connectors Electrical Conductivity, Moderate Strength
Contacts Electrical Conductivity, Moderate Strength
Electric Motor and Generator Components Electrical Conductivity
Electrical Conductors Requiring Greater Strength than Copper Electrical Conductivity, Moderate Strength
Electrical Connectors Electrical Conductivity, Thermal Conductivity, Heat Treatable, Moderate Strength
Electron Tube Grid Side Rods Electrical Conductivity, Moderate Strength, Retains Strength at High Temperatures
Parts for Electronic Devices Electrical Conductivity, Moderate Strength
Semi-Conductor Bases Electrical Conductivity, Moderate Strength
Switch Contacts Electrical Conductivity
Switch Gears Electrical Conductivity, Moderate Strength
Thermal Conductors Requiring Greater Strength than Copper Electrical Conductivity, Moderate Strength
Industrial Resistance Welding Machine Electrodes Electrical Conductivity
Seam Welding Wheels Electrical Conductivity
Spot Welding Tips Electrical Conductivity

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