Performance of Beryllium Copper
Provides in-depth data on beryllium copper properties, including spring properties, bending formability, thermal stability, and fatigue strength.
Products
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.
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.
Note: These are typical values as measured by NGK. They do not constitute guarantees.
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. |
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 |
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 |
Coil | Thickness | 0.05 - 2.0mm |
---|---|---|
Width | max. 200mm | |
Cut to length | Thickness | 0.05 - 6.0mm |
Length | max. 1200 mm |
Diameter | 1 - 120mm |
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Diameter | in coil | 0.2 - 1.0mm |
---|---|---|
on bobbin | 0.05 - 0.15mm |
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