C18200 Chromium Copper

The following data is provided for informational purposes only. It was provided with permission by the Copper Development Association at www.copper.org.

Last Update: Jan 10, 2007

Chemical Composition (%max., unless shown as range or min.)

Cu(1) Cr Fe Pb Si
Min./Max. Rem. .6–1.2 .10 .05 .10
Nominal 99.1 .9

(1) Cu value includes Ag.
Note: Cu + Sum of Named Elements, 99.5% min.

Applicable Specifications

Product Specification
Bar MILITARY MIL–C–19311
Forgings MILITARY MIL–C–19311
Rod MILITARY MIL–C–19311
Strip MILITARY MIL–C–19311
Wire, Soft ASTM F9

Common Fabrication Processes
Bending, Cold working, Drawing, Extruding, Forging, Heading, Hot working, Impacting, Rolling, Swaging

Fabrication Properties

Joining Technique Suitability
Soldering Good
Brazing Good
Oxyacetylene Welding Not Recommended
Gas Shielded Arc Welding Good
Coated Metal Arc Welding Not Recommended
Spot Weld Not Recommended
Seam Weld Not Recommended
Butt Weld Fair
Capacity for Being Cold Worked Excellent
Capacity for Being Hot Formed Good
Forgeability Rating 80
Machinability Rating 20

Physical Properties

US Customary Metric
Melting Point – Liquidus 1967 F 1075 C
Melting Point – Solidus 1958 F 1070 C
Density 0.321 lb/in3 at 68 F 8.89 gm/cm3 @ 20 C
Specific Gravity 8.89 8.89
Electrical Resistivity* 13.0 ohms–cmil/ft @ 68 F 2.16 microhm–cm @ 20 C
Electrical Conductivity* 80% IACS @ 68 F 0.468 MegaSiemens/cm @ 20 C
Thermal Conductivity* 187.0 Btu · ft/(hr · ft2·oF)at 68F 323.6 W/m · oK at 20 C
Coefficient of Thermal Expansion 9.8 ·10–6 per oF (68–212 F) 17.6 ·10–6 per oC (20–100 C)
Specific Heat Capacity 0.092 Btu/lb/oF at 68 F 385.5 J/kg · oK at 293 K
Modulas of Elasticity in Tension 17000 ksi 117000 MPa
Modulus of Rigidity 7200 ksi 49640 MPa

*Solution heat treated, cold worked (50% minimum) and aged.

Tempers Most Commonly Used

Flat Products
BAR, DRAWN M20
PLATE TB00, TD01, TH01
SHEET O61, TH01
STRIP, ROLLED O61, TB00, TD01, TH01

Typical Uses

Consumer
Pencil–type & Light Soldering Guns: Tips, Rod Extensions

Electrical
Switch Contacts, Electric Motor and Generator Components, Contacts, Wire, High Temperature, Semi Conductor Bases, Parts for Electronic Devices, Cable, Connectors, Thermal Conductors Requiring Greater Strength than Copper, Switch Gears, Electrical Connectors, Electrical Conductors Requiring Greater Strength than Copper, Arcing and Bridging Parts, Circuit Breaker Parts, Electron Tube Grid Side Rods

Industrial
Seam Welding Wheels, Electrode Holder Jaws, Flash Welding Electrodes, Plastic Mold Components, Resistance Welding Machine Electrodes, Flash Welding Electrodes, Current Carrying Shafts and Arms, Wear Plates on Heavy Equipment, Heat Sinks, Structural Parts, Spot Welding Tips, Molds