Copper-beryllium alloys are mainly based on copper with a beryllium addition. High strength beryllium copper alloys contain 0.4-2% of beryllium with about 0.3 to 2.7% of other alloying elements such as nickel, cobalt, iron or Lead. The high mechanical strength is achieved by precipitation hardening or age hardening.
Beryllium Copper is a copper alloy with the optimum combination of mechanical and physical properties such as tensile strength, fatigue strength, performance under elevated temperatures, electrical conductivity, bending formability and corrosion resistance. Beryllium Copper is widely used as contact springs in various applications like connectors, switches, relays, etc.
The copper-beryllium alloys processed by Tankii offer a wide combination of mechanical and electrical properties which is unique for copper alloys. The mechanical strength achieved after heat treatment ranks highest amongst all the copper alloy materials and is combined with a high electrical conductivity which outperforms that of bronzes.
Our alloys combine a range of properties particularly suited to meet the exacting requirements of many applications in the automotive, electronic, aeronautical, Oil&Gas, watch, electro-chemical industries, etc. Beryllium Copper is widely used in those fields as contact springs in various applications like connectors, switches, relays, etc. Tankii offers a variety of Beryllium Copper alloys in several tempers to cover different applications.
Chemical Composition
| ASTM |
Cu |
Ni |
Co |
Be |
| C17200 |
Balance |
Ni+Co≥0.2,Ni+Co+Fe≤0.6 |
1.80-2.10 |
| C17000 |
Balance |
Ni+Co≥0.2,Ni+Co+Fe≤0.6 |
1.60-1.85 |
| C17300 |
Balance |
Ni+Co≥0.2,Ni+Co+Fe≤0.6 |
1.85-2.10 |
| ASTM |
Cu |
Ni |
Co |
Be |
| C17500 |
Balance |
- |
2.4-2.7 |
0.4-0.7 |
| C17510 |
Balance |
1.4-2.2 |
0.3 |
0.2-0.6 |
beryllium copper C17200
Cube2--C17200 (CDA 172) Beryllium Copper is the most commonly utilized Copper Beryllium alloy and is notable for its highest strength and hardness compared to commercial copper alloys. C17200 alloy contains appr. 2% of beryllium and achieves its ultimate tensile strength can exceed 200 ksi, while the hardness approaches Rockwell C45. Meanwhile, the electrical conductivity is a minimum of 22% IACS in the fully aged condition.C17200 also exhibits exceptional resistance to stress relaxation at elevated temperatures.
Typical Physical Properties
| Density (g/cm3) |
8.36 |
| Density before age hardening (g/cm3 |
8.25 |
| Elastic Modulus (kg/mm2 (103)) |
13.40 |
| Thermal Expansion Coefficient (20 °C to 200 °C m/m/°C) |
17 x 10-6 |
| Thermal Conductivity (cal/(cm-s-°C)) |
0.25 |
| Melting Range (°C) |
870-980 |
Mechanical property:(before heat treatment)
| status |
Tensile strength
(Kg/mm3) |
Hardness
(HV) |
Conductivity
( IACS%) |
Elongation
(%) |
| H |
70-85 |
210-240 |
22 |
2-8 |
| 1/2H |
60-71 |
160-210 |
22 |
5-25 |
| 0 |
42-55 |
90-160 |
22 |
35-70 |
Mechanical property:(after heat treatment)
| status |
Tensile strength
(Kg/mm3) |
Hardness
(HV) |
Conductivity
(IACS%) |
Elongation
(%) |
| H |
130-151 |
380-420 |
22 |
1-5 |
| 1/2H |
126-147 |
370-410 |
22 |
2-7 |
| 0 |
112-135 |
350-339 |
22 |
3-11 |
Features
1. High thermal conductivity
2. High corrosion resistance, especially suitable for polyoxyethylene (PVC) products mold.
3. High hardness, wear resistance and toughness, as inserts used with mould steel and aluminium can make the mold play a highly efficient, prolong the service life.
4. Polishing performance is good, can achieve high mirror surface precision and complicated shape design.
5. Good tackiness resistance, easy to welding with other metal, easy to machining, there is no need additional heat treatment.
