Chromium Copper
Overview
C18200 is a precipitation-hardened copper alloy that combines high electrical conductivity (80% IACS) with moderate strength. It is the standard alloy for resistance welding electrodes and other applications requiring both conductivity and wear resistance.
As a C18200 chromium coppersupplier, Triton Bronze & Metals stocks copper in round bar, flat bar, plate — all cut to length and shipped from US mills. Certified mill test reports available to meet your quality requirements.
Chemical Composition — C18200
| Element | Content |
|---|---|
| Copper (Cu) | 98.5% min |
| Chromium (Cr) | 0.6-1.2% |
| Iron (Fe) | 0.10% max |
| Silicon (Si) | 0.10% max |
Mechanical Properties
Physical Properties
| Property | Value |
|---|---|
| Density | 0.321 lb/in³ (8.89 g/cm³) |
| Melting Range | 1875-1967°F (1024-1075°C) |
| Modulus of Elasticity | 17,000 ksi (117 GPa) |
| Thermal Conductivity | 187 BTU/ft·hr·°F (324 W/m·K) |
| Coefficient of Thermal Expansion | 9.4 × 10⁻⁶ /°F (16.9 × 10⁻⁶ /°C) |
| Electrical Conductivity | 80% IACS (aged) |
Applicable Specifications
- ✓ASTM B441 (Rod & Bar)
- ✓RWMA Class 2
- ✓SAE J461 / J463
- ✓MIL-C-19311
Fabrication & Joining
| Process | Rating |
|---|---|
| Soldering | Good |
| Brazing | Good |
| Gas Shielded Arc Welding | Fair |
| Heat Treatment | Solution anneal 1830°F, age 930°F (3 hrs) |
Common Applications
- •Resistance welding electrodes
- •Electrical switches
- •Circuit breaker components
- •Seam welding wheels
- •Cable connectors
- •Mold inserts
Frequently Asked Questions
What forms is C18200 Chromium Copper available in?+
We supply C18200 in Round Bar, Flat Bar, Plate. All material is sourced from US mills, cut to length, and shipped directly to your facility.
What are the typical applications for C18200?+
C18200 is commonly used for resistance welding electrodes, electrical switches, circuit breaker components, seam welding wheels. Contact us for application-specific recommendations.
Can I get a mill test report for C18200?+
Yes. Mill test reports (MTRs) are available upon request for all C18200 orders. We can also provide material certifications to meet your quality requirements.
Dimensional Tolerances
For standard finishing allowances, diameter tolerances, and concentricity data for continuous cast copper products, see our tolerance reference.
View Tolerances & Finishing Allowances →Need Finished Parts?
Need C18200 machined to spec? We offer custom machined parts, bronze bushings, bearings, and wear components in any alloy we stock.
View Finished Parts & Components →Available Forms
- Round Bar
- Flat Bar
- Plate
Need C18200?
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