Products / C70250
C7025 Copper-Nickel-Silicon Strip
C7025 combines high strength with conductivity of 40 % IACS or better and good resistance to stress relaxation at elevated temperature. It is widely specified for fine-pitch connector terminals and lead frames where beryllium-free material is required.
Equivalent designations
| System | Designation |
|---|---|
| UNS | C70250 |
| EN | CuNi3SiMg |
| JIS | C7025 |
Typical applications
- Fine-pitch connector terminals
- Board-to-board and I/O contacts
- Lead frames
- Automotive terminals
- Relay springs
Chemical composition (%)
| Element | Content |
|---|---|
| Ni | 2.2 – 4.2 |
| Si | 0.25 – 1.2 |
| Mg | 0.05 – 0.30 |
| Cu | Balance |
Physical properties
| Property | Value |
|---|---|
| Density | 8.82 g/cm³ |
| Elastic modulus | 131 GPa |
| Electrical conductivity | ≥ 40 % IACS |
Tempers and tensile strength
| Temper | Condition | Tensile strength (MPa) |
|---|---|---|
| TM00 | Mill hardened | 620 – 760 |
| TM02 | Mill hardened | 655 – 825 |
| TM03 | Mill hardened | 690 – 860 |
Values follow the limits of the governing standard. The mill test certificate for each lot states the measured values.
Supply range
| Item | Value |
|---|---|
| Form | Coil |
| Thickness and width | Supplied to your specification |
| Minimum order | Quoted with each enquiry |
| Lead time | Ex-stock items ship within 48 hours; other items quoted with each enquiry |
Questions buyers ask
How does C7025 compare with beryllium copper?
C7025 has lower peak strength than age-hardened C17200 but roughly twice the conductivity, contains no beryllium and needs no heat treatment after stamping. For many terminal designs it is the more economical choice.
Do you also supply C7035?
Yes. C7035 is a cobalt-bearing copper-nickel-silicon alloy with higher strength than C7025, used where thinner gauges must carry the same contact force. Send us the temper and gauge you need.
What documents come with each shipment?
The original mill test certificate for the heat lot and a packing list with coil numbers. RoHS and REACH declarations are provided on request.
Request a quotation
Send us the grade, temper, thickness, width and quantity. We reply within one working day.
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