Chromium Copper C18200 is a high-strength, high-conductivity copper alloy containing approximately 0.6–1.2% chromium. It is widely used in applications requiring excellent electrical and thermal conductivity combined with resistance to softening at elevated temperatures.
This alloy is especially valued in welding, power transmission, and high-current electrical applications where pure copper would deform or soften.
Typical Chemical Composition
| Element | Typical % |
|---|---|
| Copper (Cu) | 98.8 – 99.4 |
| Chromium (Cr) | 0.6 – 1.2 |
| Impurities | Tightly controlled |
Electrical & Thermal Performance
| Property | Typical Value |
|---|---|
| Electrical Conductivity | 80 – 90% IACS |
| Thermal Conductivity | High (below OF Cu, above most alloys) |
| Heat Dissipation | Excellent under continuous load |
Mechanical & Physical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength (aged) | 380 – 480 MPa |
| Yield Strength | 300 – 400 MPa |
| Hardness | 110 – 150 HB |
| Density | ~8.9 g/cm³ |
| Wear & Fatigue Resistance | High |
| Corrosion Resistance | Very good |
Strengthening & Metallurgical Behavior
Chromium Copper C18200 is strengthened through precipitation hardening:
✔ Solution heat treatment dissolves chromium into the copper matrix
✔ Aging treatment forms fine chromium precipitates
✔ Precipitates block dislocation movement
✔ High strength achieved with minimal conductivity loss
This metallurgical mechanism allows C18200 to retain strength at temperatures where pure copper would soften rapidly.
Key Applications
Electrical & Power Systems
Resistance welding electrodes and holders
High-current electrical contacts
Switchgear and circuit breaker components
Busbars under mechanical stress
Welding & Thermal Applications
Spot and projection welding tips
Seam welding wheels
Heat-resistant electrical connectors
Automotive & Industrial
Body-in-white welding components
EV and hybrid vehicle connectors
High-wear electrical parts in automation
Aerospace & Heavy Engineering
Electrical connectors exposed to vibration and heat
Durable structural electrical components
Advantages of Chromium Copper C18200
✔ Excellent strength-to-conductivity balance
✔ Superior resistance to softening at high temperatures
✔ Outstanding wear and fatigue resistance
✔ Reliable performance in welding environments
✔ Good corrosion resistance
✔ Long service life with reduced maintenance
Why Choose Chromium Copper (C18200)?
Choose C18200 when your application requires high electrical conductivity combined with mechanical strength, heat resistance, and durability under repetitive loads.
In simple terms:
Pure Copper (C10200) – best for conductivity
Chromium Copper (C18200) – best for conductivity + strength + heat resistance