Corson Alloys
C7025 ― Corson Alloy for lead frames and connectors
C7025
High-Performance Copper Alloy for Lead Frames and Connectors
Overview
C7025 alloy, developed by the US firm Olin Brass, is made by aging treatment, with the addition of magnesium to the usual copper-nickel-silicon Corson alloy. Today it is a global standard Corson alloy for use in lead frames and connectors. We provide C7025 alloy jointly with the Olin Group in a multi-sourcing arrangement.
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 | 40min | %IACS (@20℃) |
|---|---|---|
| Specific resistance | 38.3 | nΩ·m (@20℃) |
| Thermal conductivity | 180 | W/mK |
| Linear expansion coefficient | 17.6 | ×10-6/K (20 to 300℃) |
| Modulus of elasticity | 131 | GPa |
| Density | 8.82 | g/cm3 |
Table 3. Mechanical properties and electrical conductivity of C7025 alloy for connectors
(upper: typical values, lower: specification range)
| Temper | Tensile strength (MPa) |
Yield strength (MPa) |
Elongation (%) |
Vickers hardness (Hv) |
Electrical conductivity (%IACS) |
|---|---|---|---|---|---|
| TM02 | 725 (650-740) |
644 (585min) |
13 (10.0min) |
215 (190-240) |
45 (40min) |
| TM03 | 744 (680-760) |
710 (655min) |
9 (5.0min) |
235 (200-250) |
|
| TM04 | 814 (750-840) |
800 (740min) |
3 (1.0min) |
248 (225-275) |
|
| TM04S | 785 (710-830) |
772 (700min) |
3.8 (1.0min) |
246 (210-260) |
50 (45min) |
| TR02 | 650 (607-726) |
575 (550min) |
10 (6.0min) |
204 (180-220) |
45 (40min) |
Table 4. Mechanical properties and electrical conductivity of C7025 alloy for lead frames
(upper: typical values, lower: specification range)
| Temper | Tensile strength (MPa) |
Elongation (%) |
Vickers hardness (Hv) |
Electrical conductivity (%IACS) |
|---|---|---|---|---|
| 1/2H | 650 (607-726) |
10 (6.0min) |
204 (180-220) |
45 (40min) |
| SH | 860 (800-920) |
3 (1.0min) |
255 (235-275) |
48 (40min) |
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