Performance of Beryllium Copper
Provides in-depth data on beryllium copper properties, including spring properties, bending formability, thermal stability, and fatigue strength.
Products
Beryllium Copper Strip (Strip, Plate, Rod and Wire forms)
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- Special Metals
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Overview
Widely used for contact springs, these core NGK products, available as strips, plates, rods, or wire, offer an ideal combination of properties such as tensile strength, electrical conductivity, fatigue strength, thermal stability, bending formability, and corrosion resistance.
Features
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, corrosion resistance and non-magnetic. Beryllium Copper is widely used as contact springs in various applications like connectors, switches, relays, etc. NGK offers a variety of Beryllium Copper alloys in several tempers to cover different applications. Our Beryllium Copper products are available in strip, plate, rod and wire forms.
Properties of Beryllium Copper
Tensile Strength vs. Electrical Conductivity
Note: These are typical values as measured by NGK. They do not constitute guarantees.
Chemical Composition
| NGK Alloy | Chemical Composition [wt%] | |
|---|---|---|
| Alloy 25 | Be Ni+Co Ni+Co+Fe Cu+Be+Ni+Co+Fe |
1.80-2.00 0.20min. 0.6max. 99.5min. |
| Alloy 8 Alloy 11 |
Be Ni Cu+Be+Ni |
0.20-0.60 1.40-2.20 99.5min. |
| Alloy 7 | Be Ni+Co Al Cu+Be+Ni+Co+Al |
0.20-0.40 1.80-2.50 0.6max. 99.0min. |
Physical Properties
| Item | NGK Alloy 25 | NGK Alloy 8·11 | NGK Alloy 7 |
|---|---|---|---|
| Melting Point (solidus) [℃] | 865 | 1004 | 1050 |
| Melting Point (liquidus) [℃] | 980 | 1070 | 1081 |
| Density [g/cm3] at 20℃ |
8.36 | 8.82 | 8.71 |
| Specific Heat [J/(kg・K)] at 20℃ |
419 | 419 | 419 |
| Thermal Expansion Coefficient [/℃] at 20〜300℃ |
17.8×10-6 | 17.6×10-6 | 17.6×10-6 |
| Modulus of Elasticity [kN/mm2] | 127 | 132 | 127 |
| Modulus of Rigidity [kN/mm2] | 49 | 52 | 49 |
| Poidon's Ratio | 0.3 | 0.3 | 0.3 |
| Magnetic Permeability [μ(μ=1+4πk)] | 1.000042 | 1.000031 | 1.000027 |
Electrical conductivity and thermal conductivity * （at 20℃）
| NGK Alloy 25 | NGK Alloy 8 | NGK Alloy 11 | NGK Alloy 7 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Age Hardenable | Mill hardened | 8-1/2HT | 8-HT | 11-HT | 11-SHC | 7-1/2HT | 7-HT | 7-EHT | |
| Thermal conductivity [W/(m・K)] | 99 | 85 | 298 | 280 | 262 | 221 | 194 | 180 | 176 |
| Electrical conductivity [%IACS] | 24 | 21 | 68 | 64 | 60 | 51 | 45 | 42 | 41 |
Forms of Copper Beryllium Products
Strip: Range of Standard Production
| Coil | Thickness | 0.05 - 2.0mm |
|---|---|---|
| Width | max. 200mm | |
| Cut to length | Thickness | 0.05 - 6.0mm |
| Length | max. 1200 mm |
- *Please contact us for special requirement.
- *Alloy 7 and 8 are available in standard thickness dimensions.
- *The range may vary depending on alloy and temper.
Rod: Range of Standard Production
| Diameter | 1 - 120mm |
|---|
Wire: Range of Standard Production
| Diameter | in coil | 0.2 - 1.0mm |
|---|---|---|
| on bobbin | 0.05 - 0.15mm |
Technical data
Product Overview of Copper Beryllium
- Features of Beryllium Copper, Tensile Strength vs. Electrical Conductivity, Chemical Composition, Physical Properties, Electrical conductivity and thermal conductivity（PDF:4709KB）
- Copper Beryllium Properties and Applications, Reference standards（PDF:4967KB）
- Forms of Copper Beryllium Products（PDF:4710KB）
- Mechanical Properties of High Strength Material (Alloy 25), Tolerances（PDF:4709KB）
- Mechanical Properties of High Electrical Conductivity Material (Alloy 8 & Alloy 11), Tolerances（PDF:4699KB）
- Mechanical Properties of Midrange Material (Alloy 7), Tolerances（PDF:4650KB）
- Properties of Rod and Wire (Alloy 25 & Alloy 11), Diameter Tolerance（PDF:4674KB）
Featured Articles
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- Properties (Chemical Composition, Physical Properties, Electrical conductivity and thermal conductivity etc.)
- Test data (Tensile strength, Yield strength 0.2% offset, Elongation, Hardness etc.)
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