Spring Properties That Outperform All Copper Alloys
Our beryllium copper round bar does something that other copper alloys cannot. It returns to its original shape after bending. This elastic property makes it ideal for springs and contacts. The material behaves like a copper alloy with the memory of steel. Beryllium changes the copper structure at the atomic level. The resulting material has exceptional strength and elasticity. It also resists stress relaxation. This means it holds its spring force over time. Contacts stay tight. Springs maintain their pressure. This reliability is critical in electrical applications. Our customers in the aerospace industry specify beryllium copper for critical components.
Single-Pass Machining for Work-Hardening Control
Beryllium copper work-hardens quickly. Each cutting pass hardens the surface. A second pass becomes extremely difficult. The tool will wear rapidly. The surface finish will also suffer. Our team uses a different approach. We complete the final dimension in one pass. This requires precise tool setup. The tool must be sharp and properly positioned. The depth of cut must be correct. The cutting speed must be optimized. Our workers have developed specific parameters for this process. They have documented these parameters. Every batch runs with the same settings. This ensures consistent results across all orders.
Stock Sizes and Material Specifications
We stock beryllium copper round bar in Φ6, Φ8, Φ10, Φ18, Φ20, and Φ22. The numbers represent the diameter. The material is T2 copper base with beryllium 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 Beryllium Copper Is Essential
Beryllium copper round bar is specified for applications that demand both conductivity and elasticity. Electrical contacts need both properties. The contacts must carry current and maintain pressure. Switch gear relies on beryllium copper springs. The springs hold contacts in position. Relays use beryllium copper components. The material returns to shape after millions of cycles. Automotive connectors also use it. The vibration environment requires reliable contacts. The material also performs well at elevated temperatures. It maintains its spring properties even when warm. Our customers include high-end electronics manufacturers. They trust beryllium copper for mission-critical applications.
OOrder and Production Information
We start production right after order confirmation. 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. Our team follows the documented process for every order.
Technical Parameters
|
Parameter |
Value |
|
Material Grade |
T2 Copper Base + Beryllium 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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