Products
Material (Beryllium Copper)
Overview
Alloys combine the advantages of copper with strength and corrosion resistance
Beryllium copper is a precipitation hardening alloy made by adding 2% or less percenteag beryllium to copper and special heat treatments.
It keeps copper's strong points of such as "good conductor of heat" and "good conductor of electricity", and it combines strength and corrosion resistance comparable to special steels.
Features of Beryllium Copper
- Thermal Conductivity
-
- It has thermal conductivity of about 130-245W/m･°C by each alloy, and it is used for applications requiring efficient heat dissipation.
- Electrical Conductivity
-
- It has conductivity of 32-58% IACS by each alloy, and it is used for applications requiring high current density.
- Hardness
-
- Due to precipitation hardening, it has a hardeness HRB98~ HRC40 which is comparable to steel material and has the highest strength in copper alloy.
- Corrosion Resistance
-
- Beryllium Copper has excellent corrosion resistance, nearly the same as Nickel Silver.
Forms, features and applications of Beryllium Copper Products
| Features | Alloy | Trade Name | Forms | Applications | Reference standards | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Rod | Plate | Mold Products | Electrode | Aircraft Bushings | CDA | Equivalent to JIS | Equivalent to ASTM | Equivalent to RWMA | |||
| High Strength Alloy | BeA-25 | ULTRA SUPRA II | C17200 | C1720 | B196 | Class4 | |||||
| High Conductive Alloy | BeA-11 | PLUS | - | C17510 | C1751 | B441 | Class3 | ||||
Chemical Composition and Properties of Beryllium Copper
Chemical Composition
| Composition | High Strength Alloy |
|---|---|
| BeA-25 ULTRA / SUPRA II |
|
| Be | 1.80 - 2.00 |
| Co+Ni | 0.20 min. |
| Ni+Co+Fe | 0.60 max. |
| Cu+Be+Ni+Co+Fe | 99.5 min. |
| Composition | High Conductive Alloy |
|---|---|
| BeA-11 PLUS | |
| Be | 0.20 - 0.60 |
| Ni | 1.40 - 2.20 |
| Cu+Be+Ni | 99.5 min. |
- The chemical composition of beryllium copper alloys is tested and provided according to NGK standards using luminescence analysis.
Properties of Beryllium Copper
| Items | Unit | High Strength Alloy | High Conductive Alloy | Hot Work Tool Stesl | ||
|---|---|---|---|---|---|---|
| BeA-25 | BeA-11 | SKD61 | ||||
| ULTRA | SUPRA II | PLUS | Heat treated | |||
| Physical Properties | Thermal Conductivity | W/m･°C | 130 | 145 | 245 | 30.5 |
| Electrical Conductivity | lACS% | 32 | 38 | 58 | 18 | |
| Specific Gravity | - | 8.26 | 8.75 | 7.74 | ||
| Melting Points | ℃ | 865 - 980 | 1004 - 1070 | 1500 - 1600 | ||
| Coefficent of Thermal Expansion | (20 - 200°C) | 17.8×10-6 | 17.6×10-6 | 13.3×10-6 | ||
| Volume Resistivity | µΩ-cm | 6.0 - 7.8 | 2.9 - 3.4 | 9.6 | ||
| Specific Heat | (30 - 300°C) J/(kg･K) | 419 | 419 | 450 | ||
| Modulus of Elasticity | kN/mm² | 127 | 132 | 206 | ||
| Magnetism (Permeability) |
- | none (1.000042) |
none (1.000031) |
existence (-) |
||
| Mechanical Properties | Hardness | Rockwell Scale | C40 | C32 | B98 | C43 - 55 |
- The above values are for design guidance only. And also they may vary slightly depending on the shape.
- Thermal conductivity is a value calculated from measurements of electrical conductivity.
Relationship between Hardness and Thermal Conductivity
- Generally, high strength materials have low thermal conductivity.
- Beryllium copper not only has high strength but also high thermal conductivity, it efficiently dissipates heat.
Inquiry about Products
NGK FINE MOLDS, INC.
- Chubu Sales Office +81-52-884-2611