High‑Performance M25 Copper Alloy – ASTM B197 Grade C17300 TH04
Alloy M25 from Materion Performance Alloys is a free machining, high performance copper alloy. M25’s properties minimize signal distortion in coaxial RF connectors and reduce power loss in circular connectors and contact probes. M25 is available in spooled or coiled wire product forms, and in different tempers to accommodate diverse design requirements. After machining and forming operations, M25 parts can be easily heat treated and plated to obtain maximum mechanical and electrical performance. Applications requiring stability to 175° C or reliable contact force in miniaturized designs specify Alloy M25. In demanding electronic applications, M25 provides performance and reliability superior to any free machining copper alloy.
Properties
General
| Property | Temperature | Value |
|---|---|---|
Density | 23.0 °C | 8.36 - 8.8 g/cm³ |
Dimension
| Property | Value | Comment |
|---|---|---|
Diameter | 0.76 - 63.5 mm | Smaller diameter wire may be produced by wire redrawers. |
Length | 3700 mm |
Mechanical
| Property | Temperature | Value |
|---|---|---|
Elastic modulus | 23.0 °C | 120 - 131 GPa |
Elongation | 23.0 °C | 2 - 75 % |
Tensile strength | 23.0 °C | 410 - 1550 MPa |
Yield strength | 23.0 °C | 1220 MPa |
Yield strength Rp0.2 | 23.0 °C | 130 - 1380 MPa |
Thermal
| Property | Temperature | Value |
|---|---|---|
Coefficient of thermal expansion | 23.0 °C | 1.6E-5 - 1.75E-5 1/K |
Melting point | 870 °C | |
Specific heat capacity | 23.0 °C | 410 J/(kg·K) |
Thermal conductivity | 23.0 °C | 105 - 110 W/(m·K) |
Electrical
| Property | Temperature | Value |
|---|---|---|
Electrical resistivity | 23.0 °C | 5.8E-6 - 7.8E-6 Ω·m |
Specific Electrical conductivity | 22 - 30 % IACS |
Chemical properties
| Property | Value | Comment |
|---|---|---|
Aluminium | 0 - 0.2 % | |
Beryllium | 1.8 - 2 % | |
Cobalt | 0.2 % | min. Nickel + Cobalt |
Copper | 95.5 - 97.8 % | Balance |
Iron | 0 - 0.6 % | max., Nickel + Cobalt + Iron |
Lead | 0.2 - 2 % | |
Nickel | 0.2 - 0.6 % | min. Nickel + Cobalt |
Other | 0 - 0.5 % | |
Silicon | 0 - 0.2 % |
Technological properties
| Property | ||
|---|---|---|
| Application areas | Coaxial RF connectors and circular connectors and contact probes. This alloy to be fabricated into contacts for electronics, aircraft and automotive applications.,Contacts for electronics, aircraft and automotive applications. It can also be machined into parts for the watch industry, contacts for circular connectors and coaxial connectors. | |
| General machinability | 60% (vs. free-cutting brass) | |
Metal
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