Beryllium copper (BeCu), also known as copper beryllium or beryllium bronze, is a premium copper alloy containing 0.5-3% beryllium by weight. This small addition transforms ordinary copper into one of the strongest copper alloys available, combining exceptional mechanical properties with excellent electrical and thermal conductivity. For Southeast Asian manufacturers selling on Alibaba.com, understanding these properties is crucial for positioning products correctly in the global B2B marketplace.
The unique value proposition of beryllium copper lies in its ability to maintain high conductivity while achieving tensile strengths comparable to many steels. After age hardening, BeCu can reach tensile strengths of 60-220 ksi (414-1,517 MPa), with yield strengths ranging from 28-205 ksi. This makes it ideal for applications requiring both spring properties and electrical conductivity—a combination few other materials can match.
Beryllium Copper Technical Specifications (C17200 Alloy)
| Property | Value Range | Test Standard |
|---|---|---|
| Beryllium Content | 1.7-1.9% | ASTM B194 |
| Tensile Strength | 60-220 ksi (414-1,517 MPa) | ASTM B194 |
| Yield Strength | 28-205 ksi (193-1,413 MPa) | ASTM B194 |
| Electrical Conductivity | 15-60% IACS | ASTM B193 |
| Hardness | B45-C45 Rockwell | ASTM E18 |
| Fatigue Strength | 30-60 ksi | Rotating Beam Test |
| Thermal Stability | Up to 150°C+ | Industry Standard |
The conductivity range of 15-60% IACS (International Annealed Copper Standard) is particularly noteworthy. While pure copper achieves 100% IACS, beryllium copper maintains sufficient conductivity for most electrical contact applications while gaining dramatically improved mechanical properties. This trade-off makes BeCu the material of choice for high-reliability connectors, switch contacts, and spring-loaded electrical components where both conductivity and mechanical durability are critical.

