What is C18200 Chromium Copper?
C18200 chromium copper is a precipitation-hardenable copper alloy that combines high electrical conductivity with better strength and softening resistance than pure copper. It is commonly known as CDA 182, chromium copper, or RWMA Class 2 copper.
C18200 is used where a component must conduct electricity or heat while carrying mechanical load, especially in resistance welding, electrical contacts, molds, and high-conductivity machined parts.
Common Names and Cross References
| Name or designation | How it is commonly used |
|---|---|
| C18200 | UNS alloy designation |
| CDA 182 | Copper Development Association style designation |
| RWMA Class 2 | Resistance welding material designation |
| Chromium copper | Alloy family description |
Chemical Composition (%)
| Element | Minimum | Maximum | Nominal |
|---|---|---|---|
| Copper (Cu) | - | - | About 99.1 |
| Chromium (Cr) | 0.6 | 1.2 | - |
| Iron (Fe) | - | 0.10 | - |
| Lead (Pb) | - | 0.05 | - |
| Silicon (Si) | - | 0.10 | - |
Mechanical, Electrical, and Physical Properties
Properties vary by temper and heat treatment. The values below reflect common precipitation-hardened rod and bar datasheet ranges.
| Property | Typical published value |
|---|---|
| Electrical conductivity | About 80% IACS |
| Tensile strength | 65,000-86,000 psi, depending on temper |
| Yield strength | 55,000-65,000 psi, common precipitation-hardened range |
| Elongation | About 14-18%, depending on temper |
| Hardness | Rockwell B 70-82 typical |
| Machinability rating | 20, based on free-cutting brass = 100 |
Fabrication Suitability
| Operation | Suitability |
|---|---|
| Cold working | Excellent |
| Hot forming | Good |
| Forgeability | Good, rating about 80 |
| Soldering | Good |
| Brazing | Good |
| Gas shielded arc welding | Good |
| Oxyacetylene welding | Not recommended |
| Spot welding | Not recommended |
Typical Applications for C18200
- Resistance welding electrodes and RWMA Class 2 components.
- Electrical contacts, connectors, and conductive parts.
- Mold components and heat-transfer tooling.
- High-conductivity machined parts requiring more strength than C110 copper.
- Industrial copper parts exposed to heat and electrical load.
RFQ Details for C18200 Parts
Send the C18200 or RWMA Class 2 callout, temper or heat treatment, conductivity requirement, finished dimensions, quantity, and drawing files. If maximum conductivity matters more than strength, compare with C11000 ETP copper.
Available Forms
Available Forms and Shapes
Review common product forms for C18200 Chromium Copper, then send drawings, dimensions, quantity, and finished-part requirements for material and production guidance.
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