Enhanced Hardness from Chromium Addition
Our chromium copper rod has chromium added to the copper base. This single addition changes the material in important ways. Chromium makes the copper significantly harder. It also improves wear resistance substantially. The rod wears very little under repeated friction. This makes it ideal for applications with moving contacts. Our customers often use this material for contacts that require frequent plugging and unplugging. The chromium content also raises the softening temperature. The rod maintains its hardness even when operating temperatures rise. This is important in applications with intermittent high currents. The material does not anneal or soften under normal operating conditions.
Processing Challenges and Solutions
Chromium copper presents unique processing challenges. The material is more brittle than standard copper. Aggressive cutting can cause surface cracks. Our team has developed specific methods for this material. We reduce the cutting speed significantly. We also reduce the feed rate. This prevents cracks from forming on the surface. The right tool selection also matters. We use carbide inserts specifically designed for this material. They hold up better than standard tooling. Our workers monitor the cutting process closely. They watch for any signs of tool wear or surface issues. We have documented our successful parameters. Every batch runs with the same proven settings. This consistency ensures reliable results.
Dimensional Range and Material Specifications
We stock chromium copper rod in Φ6, Φ8, Φ10, Φ18, Φ20, and Φ22. The numbers indicate the diameter. The base material is T2 copper with chromium content. Production follows GB/T5585.1-2026. Copper purity reaches Cu≥99.90%. Total impurities stay below 0.10%. Conductivity is ≥97.3% IACS. Resistivity at 20°C stays ≤0.0177 Ω·mm²/m. Density is 8.9 g/cm³. Tensile strength ranges from 220 to 260 MPa. Yield strength exceeds 170 MPa. Hardness is 65 to 90 HV. Elongation is 17% or higher.
Where Hardness Matters Most
Chromium copper rod excels in applications with mechanical wear. High-frequency plug contacts are a typical use. The material resists the wear from repeated connections. Electrical contacts that slide or rotate also benefit. Switch contacts experience friction during operation. Chromium copper holds up well. The hard surface also resists galling. This prevents contacts from sticking or welding together. Our customers include electrical component manufacturers. We also serve the automotive industry. Starter motor contacts often use this material. The product performs reliably in demanding environments. Export orders continue to grow as more customers discover its benefits.
Order and Production Information
We use dedicated CNC parameters for chromium copper. Feed rates and speeds differ from standard copper. Standard sizes ship within one week. Custom sizes take one to two weeks. The minimum order is 1000 kilograms. Mixed specifications are allowed. We welcome third-party inspection at our factory. Our raw material inventory stays well-stocked. We accept USD, EUR, and CNY.
Technical Parameters
|
Parameter |
Value |
|
Material Grade |
T2 Copper Base + Chromium Alloy |
|
Copper Purity |
Cu≥99.90% |
|
Standard |
GB/T5585.1-2026 |
|
Electrical Conductivity |
≥97.3% IACS |
|
Resistivity (20°C) |
≤0.0177 Ω·mm²/m |
|
Density |
8.9 g/cm³ |
|
Tensile Strength |
220–260 MPa |
|
Yield Strength |
≥170 MPa |
|
Hardness |
65–90 HV |
|
Elongation |
≥17% |
|
Stock Sizes |
Φ6, Φ8, Φ10, Φ18, Φ20, Φ22 |
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