Corson Alloys
C7025 ― Corson Alloy for lead frames and connectors
C7025
High-Performance Copper Alloy for Lead Frames and Connectors
Overview
C7025 is a precipitation-hardened Corson alloy (Cu-Ni-Si alloy) that is widely used for connector terminals and lead frames around the world. We offer C7025 as one of our multi-source options to our customers.
Table 1. C7025 chemical composition (%)
| Cu | Ni | Si | Mg | |
|---|---|---|---|---|
| Standard composition | Remainder | 3.0 | 0.65 | 0.15 |
Table 2. Physical properties of C7025
| Electrical conductivity | 45 SH:48 TM04S:50 |
%IACS (@20℃) |
|---|---|---|
| Specific resistivity | 38 SH:36 TM04S:34 |
nΩ·m (@20℃) |
| Thermal conductivity | 180 SH:192 TM04S:200 |
W/mK |
| Thermal expansion coefficient | 17.6 | ×10-6/K (20 to 300℃) |
| Modulus of elasticity | 131 SH:120 |
GPa |
| Specific gravity | 8.82 |
Table 3. Mechanical properties of C7025 alloy for connectors
(upper: typical values, lower: specification range)
| Temper | Tensile strength (MPa) |
Yield strength (MPa) |
Elongation (%) |
Vickers hardness (Hv) |
|---|---|---|---|---|
| TM02 | 725 (650-740) |
644 (≧585) |
13.0 (≧10.0) |
215 (190-240) |
| TM03 | 744 (680-760) |
710 (≧655) |
9.0 (≧5.0) |
235 (200-250) |
| TM04 | 814 (750-840) |
800 (≧740) |
3.0 (≧1.0) |
248 (225-275) |
| TM04S | 820 (730-850) |
800 (≧720) |
4.0 (≧1.0) |
246 (215-265) |
Table 4. Mechanical properties of C7025 alloy for lead frames
(upper: typical values, lower: specification range)
| Temper | Tensile strength (MPa) |
Yield strength (MPa) |
Elongation (%) |
Vickers hardness (Hv) |
|---|---|---|---|---|
| TR02 | 650 (607-726) |
575 | 10.0 (≧6.0) |
204 (180-220) |
| SH | 860 (800-950) |
820 | 3.0 (≧1.0) |
255 (235-275) |
Table 5. C7025 alloy for connectors bend formability (※90°W bend test, test piece shape:10 mm wide × 30 mm long)
| Temper | Thickness (mm) |
MBR/t | |
|---|---|---|---|
| Good way | Bad way | ||
| TM02 | ≦0.20 | 1.0 | 0 |
| TM03 | ≦0.20 | 1.0 | 0.5 |
| TM04 | ≦0.20 | 2.0 | 7.0 |
| TM04S | ≦0.08 | 0 | 0 |
- MBR/t:Minimum Bend Radius without cracking / thickness
- Note that all numerical values shown are typical values.
Please inquire about bend formability of different thicknesses.
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