Chrome Copper C18200 Class II
Copper Alloy No. C18200
Chromium Copper , RWMA Class 2 Chrome Copper
Chemical Composition % by weight
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 |
| 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 |