C18200 Chromium Copper

CuCr1 – UNS.C18200 Chromium Copper is a heat treatable copper alloy offering good electrical conductivity, resistance to softening at elevated temperatures and good strength and hardness.  This combination of properties makes C18200 one of the preferred resistance welding electrode materials for a variety of applications.  Nominally composed of 99.1% copper and 0.9% chromium, this heat treatable alloy can be brought to its softest condition by annealing it at 1000°C (1850°F) for one-half hour at temperature, then rapidly quenching it in water.  In this annealed condition, the alloy is ductile and easily formed, and has an electrical conductivity of about 40% IACS.

Available Products (forms):
Round bars, Flat bars, Square bars, Rectangular bars, Hexagon bars, Plates
Custom shapes are available upon request.

Chemical Composition:

Cr: 0.60-1.20%
Cu: Balance
Note: Copper plus additions equal 99.50% minimum.

Typical Physical Properties:

Density at 68°F: 0.321 Lbs./In.3
Specific Gravity: 8.89
Melting Point (Liquidus): 1075°C (1967°F)
               (Solidus): 1070°C (1958°F)
Coefficient of Thermal Expansion per °F: 9.8 x 10-6 (77-212°F)
Electrical Conductivity at 68°F (volumetric): 80% IACS (solution heat treated, cold worked 50% minimum and aged)
Thermal Conductivity Btu/ft.2/ft./hr./°F at 68°F: 187 (solution heat treated, cold worked 50% minimum and aged)
Modulus of Elasticity - Tension: 17,000 ksi

Note: 
1). the units are based upon US Customary.
2). the typical physical properties apply to age hardened products.

International Specification:

Rods/Bars/Plates/Sheets: UNS.C18200, RWMA Class 2, CDA18200, ISO5182-1991

European Standards: CuCr, DIN 2.1291, CW105C to EN