Copper Foil and Copper Alloy
Corson Alloys
Compare Features and Typical Applications
Corson Alloys
For decades we have conducted R&D aimed at developing new Corson alloys and improving existing ones. The result is a wide network of patents covering Corson alloys with superior strength, conductivity, and bend formability, for which we have achieved the top share in the industry.
A Corson alloy is a special type of copper alloy made using Nickel and Silicon as the principal alloying elements. Taking advantage of the combination of high strength, conductivity, and bend formability, these alloys are used mainly for connector contacts and lead frames in personal computers, mobile phones, and other electronic devices. Today this alloy has become an indispensable metal material in our data-driven society.
| Alloy name | Composition | Features | Applications |
|---|---|---|---|
| Cu-3.0Ni-0.65Si-0.15Mg | Representative Corson alloy | Connectors, lead frames, CPU sockets | |
| Cu-1.6Ni-0.4Si-0.5Sn-0.4Zn | Corson alloy with excellent balance of strength and electrical conductivity | Connectors | |
| Cu-2.8Ni-0.6Si-0.5Sn-0.4Zn | Corson alloy with strength exceeding that of C7025 | Connectors | |
| Cu-2.8Ni-0.6Si-0.5Sn-0.4Zn | Lower Young's modulus than NKC286 | Connectors | |
| Cu-3.8Ni-0.8Si-0.1Mg-0.13Mn | Highest level of strength among Corson alloys | Connectors, switches | |
| Cu-3.55Ni-0.25Co-0.87Si | Maintaining the strength of the conventional high-strength Corson alloy NKC388 while increasing conductivity | Connectors, CPU sockets | |
| Cu-3.55Ni-0.25Co-0.87Si | Lower Young's modulus than NKC8738 | Connectors, CPU sockets | |
| Cu-1.6Ni-0.35Si | High-conductivity Corson alloy with spring properties | Connectors, battery terminals | |
| Cu-1.9Co-0.44Si | High-conductivity Corson alloy with spring properties | Connectors, battery terminals | |
| Cu-1.9Co-0.44Si | Corson alloy with electrical conductivity exceeding that of NKC4419 | Connectors |
Compare Composition and Properties
Corson alloy composition and properties
Chemical Composition (wt%)
| Copper Alloy Name | C7025 | NKC164 | NKC286 | NKC286S | NKC388 | NKC8738 | NKC8738S | NKC164E | NKC4419 | NKC4419 (HC) |
|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition (wt%) |
Cu : Bal. Ni : 3.0 Si : 0.65 Mg : 0.15 |
Cu : Bal. Ni : 1.6 Si : 0.4 Sn : 0.5 Zn : 0.4 |
Cu : Bal. Ni : 2.8 Si : 0.6 Sn : 0.5 Zn : 0.4 |
Cu : Bal. Ni : 2.8 Si : 0.6 Sn : 0.5 Zn : 0.4 |
Cu : Bal. Ni : 3.8 Si : 0.8 Mg : 0.1 Mn : 0.13 |
Cu：Bal. Ni：3.55 Co：0.25 Si：0.87 |
Cu：Bal. Ni：3.55 Co：0.25 Si：0.87 |
Cu : Bal. Ni : 1.6 Si : 0.35 |
Cu : Bal. Co : 1.9 Si : 0.44 |
Cu : Bal. Co : 1.9 Si : 0.44 |
Physical Properties
| Copper Alloy Name | C7025 | NKC164 | NKC286 | NKC286S | NKC388 | NKC8738 | NKC8738S | NKC164E | NKC4419 | NKC4419 (HC) |
|---|---|---|---|---|---|---|---|---|---|---|
| Specific Gravity | 8.82 | 8.87 | 8.87 | 8.87 | 8.82 | 8.83 | 8.83 | 8.89 | 8.85 | 8.85 |
| Modulus of Elasticity GPa | 131 SH:120 |
127 | 127 | 110 | SH:123 XSH:123 (TD:135) USH:120 (TD:140) |
123 | 100 | 120 | 127 | 128 |
| Electrical Conductivity %IACS (@20℃) | 45 SH:48 TM04S:50 |
43 | 41 | 41 | SH:38 XSH:34 USH:32 |
41 | 40 | 55 | 65 | 71 |
| Specific resistivity nΩ·m(@20℃) | 38 SH:36 TM04S:34 |
40 | 42 | 42 | SH:45 XSH:51 USH:54 |
42 | 44 | 30 | 27 | 24 |
| Thermal Conductivity W/(m·K) | 180 SH:192 TM04S:200 |
170 | 165 | 165 | SH:160 XSH:143 USH:136 |
165 | 163 | 240 | 260 | 288 |
| Thermal Expansion Coefficient ×10-6 /K | 17.6 | 17.6 | 17.4 | 17.4 | 17.6 | 17.6 | 17.6 | 17.7 | 17.8 | 17.8 |
| Poisson's ratio | 0.33 | 0.33 | 0.33 | 0.33 | 0.33 | 0.33 | 0.33 | 0.33 | 0.33 | 0.33 |
Mechanical Properties
| Copper Alloy Name | C7025 | NKC164 | NKC286 | NKC286S | NKC388 | NKC8738 | NKC8738S | NKC164E | NKC4419 | NKC4419 (HC) |
|
|---|---|---|---|---|---|---|---|---|---|---|---|
| Tensile Strength (MPa) | 1/4H | - | - | - | - | - | - | - | - | 520-650 (600) |
- |
| 1/2H | TR02 607-726 (650) |
560-680 (640) |
710-840 (780) |
730-870 (800) |
- | - | - | - | - | - | |
| H | SH 800-950 (860) |
620-740 (680) |
760-890 (830) |
800-940 (880) |
- | - | - | 590-680 (630) |
590-720 (670) |
540-670 (610) |
|
| EH | TM02 650-740 (725) |
680-800 (730) |
810-940 (880) |
- | - | - | - | 620-760 (690) |
- | - | |
| SH | TM03 680-760 (744) |
- | - | - | 890-990 (940) |
- | - | - | - | - | |
| ESH | TM04 750-840 (814) |
- | - | - | - | 920-1130 (1010) |
890-1070 (980) |
- | - | - | |
| XSH | TM04S 730-850 (820) |
- | - | - | 970-1090 (1030) |
- | - | - | - | - | |
| USH | - | - | - | - | 970-1090 (1030) TD:1070-1190 (1130) |
- | - | - | - | - | |
| 0.2% Yield Strength (MPa) | 1/4H | - | - | - | - | - | - | - | - | 370-500 (480) |
- |
| 1/2H | TR02 (575) |
520-670 (610) |
690-830 (760) |
695-835 (765) |
- | - | - | - | - | - | |
| H | SH (820) |
580-730 (660) |
740-880 (810) |
775-915 (845) |
- | - | - | 540-680 (610) |
570-700 (650) |
520-650 (590) |
|
| EH | TM02 ≧585 (644) |
640-790 (720) |
790-930 (860) |
- | - | - | - | 600-740 (670) |
- | - | |
| SH | TM03 ≧655 (710) |
- | - | - | 860-960 (910) |
- | - | - | - | - | |
| ESH | TM04 ≧740 (800) |
- | - | - | - | 880-1060 (960) |
860-1010 (920) |
- | - | - | |
| XSH | TM04S ≧720 (800) |
- | - | - | 940-1060 (1000) |
- | - | - | - | - | |
| USH | - | - | - | - | 940-1060 (1000) TD:1040-1160 (1100) |
- | - | - | - | - | |
| Elongation (%) | 1/4H | - | - | - | - | - | - | - | - | ≧10.0 (17.0) |
- |
| 1/2H | TR02 ≧6.0 (10.0) |
≧5.0 (8.0) |
≧3.0 (6.0) |
≧3.0 (7.0) |
- | - | - | - | - | - | |
| H | SH ≧1.0 (3.0) |
≧3.0 (6.0) |
≧2.0 (4.0) |
≧1.0 (2.0) |
- | - | - | ≧5.0 (12.0) |
≧2.0 (8.0) |
≧2.0 (6.0) |
|
| EH | TM02 ≧10.0 (13.0) |
≧1.0 (4.0) |
≧1.0 (2.0) |
- | - | - | - | ≧2.0 (5.0) |
- | - | |
| SH | TM03 ≧5.0 (9.0) |
- | - | - | ≧1.0 (3.0) |
- | - | - | - | - | |
| ESH | TM04 ≧1.0 (3.0) |
- | - | - | - | 0.1 | ≧0.5 (3.0) |
- | - | - | |
| XSH | TM04S ≧1.0 (4.0) |
- | - | - | ≧1.0 (2.0) |
- | - | - | - | - | |
| USH | - | - | - | - | ≧1.0 (2.0) |
- | - | - | - | - | |
| Vickers Hardness (Hv) | 1/4H | - | - | - | - | - | - | - | - | 160-210 (180) |
- |
| 1/2H | TR02 180-220 (204) |
160-230 (190) |
200-270 (230) |
215-285 (250) |
- | - | - | - | - | - | |
| H | SH 235-275 (255) |
170-240 (200) |
210-280 (245) |
250-320 (285) |
- | - | - | 160-220 (200) |
180-220 (200) |
160-220 (185) |
|
| EH | TM02 190-240 (215) |
200-270 (220) |
230-300 (260) |
- | - | - | - | 170-230 (210) |
- | - | |
| SH | TM03 200-250 (235) |
- | - | - | 250-310 (280) |
- | - | - | - | - | |
| ESH | TM04 225-275 (248) |
- | - | - | - | 260-370 (300) |
265-370 (295) |
- | - | - | |
| XSH | TM04S 215-265 (246) |
- | - | - | 285-350 (325) |
- | - | - | - | - | |
| USH | - | - | - | - | 285-350 (325) |
- | - | - | - | - | |
- Standard specs. (Typical values)
Bend Formability
| Copper Alloy Name | C7025 | NKC164 | NKC286 | NKC286S | NKC388 | NKC8738 | NKC8738S | NKC164E | NKC4419 | NKC4419(HC) | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Minimum Bend Radius / t Badway | 1/4H | - | - | - | - | - | - | - | - | 0.0 (t≦0.20mm) |
- |
| 1/2H | - | 0.0 (t≦0.30mm) |
0.0 (t≦0.15mm) |
0.0 (t≦0.15mm) |
- | - | - | - | - | - | |
| H | TM02 0.0 (t≦0.20mm) |
0.0 (t≦0.30mm) |
0.0 (t≦0.10mm) |
0.0 (t≦0.08mm) |
- | - | - | 0.0 (t≦0.20mm) |
0.7 (t≦0.30mm) |
0.0 (t≦0.08mm) |
|
| EH | TM03 0.5 (t≦0.20mm) |
1.5 (t≦0.25mm) |
3.0 (t≦0.10mm) |
- | - | - | - | 0.2 (t≦0.20mm) |
- | - | |
| SH | TM04 7.0 (t≦0.20mm) |
- | - | - | 1.0 (t≦0.10mm) |
- | - | - | - | - | |
| ESH | TM04S 0.0 (t≦0.08mm) |
- | - | - | - | 0.0 (t=0.05mm) 1.0 (t=0.12mm) |
0.0 (t=0.07mm) |
- | - | - | |
- Bad way 90°W-shape Bending Width=10mm
| Explanation of technical terms |
|---|
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