Resistance welding machine electrodes, seam welding wheels, electrical switch gear, electrode holder jaws, cable connectors, current carrying arms and shafts, circuit breaker parts, arcing and bridging parts, grid side rods in electron tubes, molds, spot welding tips, flash welding electrodes, electrical and thermal conductors requiring greater strength than copper, switch contacts.
Mechanical Properties
Typical for .500" rod solution heat treated and aged (500C-3 hrs.)
Hardness*
Rockwell F Scales
70
Tensile Strength**
KSI
70
Yield Strength **
KSI
55
Elongation**
% in 2 inch
21
*Hardness conversions are approximate
**Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
Thermal Conductivity
BTU/ (sq ft-ft-hr-F)
187
Specific Heat
BTU/lb/ºF @ 68F
.090
Thermal Expansion
Per °F from 68 F to 212 F
.0000098
Density
lb/cu in @ 68 F
.321
Electrical Conductivity
% IACS @ 68 F
80
Modulus of Elasticity
KSI
17,000
*Volume basis
Fabrication Practices
Capacity for being cold worked
Excellent
Capacity for being hot formed
Good
Hot forgeability rating (forging brass=100)
80
Hot working temperature
1500-1700 F or 800-925 C
Machinability rating (Free Cutting Brass=100)
20
Suitability for being joined by:
Soldering/Good
Brazing/Good
Oxyacetylene Welding/Not Recommended
Gas Shielded Arc Welding/Good
Coated Metal Arc Welding/Not Recommended
Resistance Welding
Spot/Not Recommended
Seam/Not Recommended
Butt/Fair
The values listed above represent reasonable approximations suitable for general engineering use. Due to commercial variations in composition and to manufacturing limitations, they should not be used for specification purposes. See applicable A.S.T.M. specification references.
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C18200 Chromium Copper
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Copper Alloy No. C18200 
