Corson Alloys

C7025

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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