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Copper Alloy No. C18200
Chromium Copper , RWMA Class 2 Chrome
Copper
Chemical Composition % by
weight
| Copper
(incl. silver) |
Iron |
Chromium |
Silicon |
Lead |
| 99.1
Nominal |
.10 Maximum |
.60 Minimum |
.10 Maximum |
.05 Maximum |
Applications
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 B 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* (Annealed) |
% IACS @ 68 F |
80 |
| Modulus of Elasticity |
KSI |
17,000 |
**Volume basis
Fabrication Properties
| 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 |
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Brazing/Good |
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Oxyacetylene Welding/Not Recommended |
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Gas Shielded Arc Welding/Good |
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Coated Metal Arc Welding/Not Recommended |
| Resistance Welding |
Spot/Not Recommended |
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Seam/Not Recommended |
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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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