Copper Alloy Strip

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 nitrogen 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.

NKC388 NKC286S NKC286 C7025 Standard Corson Alloy NKC164 NKC1816 NKC4820 NKC164E NKC4419
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 Wiring harnesses, connectors
Cu-2.8Ni-0.6Si-0.5Sn-0.4Zn Corson alloy with strength exceeding that of C7025 Connectors, wiring harnesses
Cu-2.8Ni-0.6Si-0.5Sn-0.4Zn Lower Young's modulus than NKC286 Connectors, wiring harnesses
Cu-3.8Ni-0.8Si-0.1Mg-0.13Mn Highest level of strength among Corson alloys Connectors, switches
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-1.5Co-0.5Ni-0.48Si High-strength, high-conductivity Corson alloy with spring properties Connectors, battery terminals
Cu-1.8Ni-1.0Co-0.6Si-0.15Cr Corson alloy with good balance of strength and electrical conductivity Connectors, CPU sockets

Compare Composition and Properties

Corson alloy composition and properties

Chemical Composition (wt%)

Copper Alloy Name C7025 NKC164 NKC286 NKC286S NKC388 NKC164E NKC4419 NKC4820 NKC1816
Chemical Composition (wt%) Cu : Rest
Ni : 3.0
Si : 0.65
Mg : 0.15
Cu : Rest
Ni : 1.6
Si : 0.4
Sn : 0.5
Zn : 0.4
Cu : Rest
Ni : 2.8
Si : 0.6
Sn : 0.5
Zn : 0.4
Cu : Rest
Ni : 2.8
Si : 0.6
Sn : 0.5
Zn : 0.4
Cu : Rest
Ni : 3.4~4.2
Si : 0.70~1.0
Mg : 0.05~0.3
Mn : 0.11~0.20
Cu : Rest
Ni : 1.6
Si : 0.35
Cu : Rest
Co : 1.9
Si : 0.44
Cu : Rest
Co : 1.5
Ni : 0.5
Si : 0.48
Cu : Rest
Ni : 1.0~2.0
Co : 1.0~2.0
Si : 0.5~1.0
Cr : 0.09~0.2

Physical Properties

Copper Alloy Name C7025 NKC164 NKC286 NKC286S NKC388 NKC164E NKC4419 NKC4820 NKC1816
Specific Gravity g/cm3 8.82 8.87 8.87 8.87 8.82 8.89 8.85 8.86 8.72
Modulus of Elasticity GPa 131 127 127 110 123
XSH: 135 (TD*)
USH: 120
USH: 140 (TD*)
120 127 120 125
Electrical Conductivity %IACS (@20℃) 45
TM04S:50
43 41 41 SH: 38
ESH, XSH, USH: 34
55 65 60 47
SH:50
Specific Resistance nΩ·m(@20℃) 38 41 42 42 SH: 45.4
ESH, XSH, USH: 50.7
30 27 29 37
Thermal Conductivity W/(m·K) 180 170 165 165 SH: 160
ESH, XSH, USH: 143
240 260 245 198
Thermal Expansion Coefficient ×10-6 /K 17.6 17.6 17.4 17.4 17.6 17.7 17.8 17.6 -
Poisson's ratio 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 NKC164E NKC4419 NKC4820 NKC1816
Tensile Strength (MPa) O   - - - - - - - -
1/4H   - - - - - 520-650 (600) - -
1/2H TR02 607-726 (650) 560-680 (640) 710-840 (780) 730-870 (800) - - - - -
H TM02 650-740 (725) 620-740 (680) 760-890 (830) 800-940 (880) - 590-680 (630) 590-720 (670) - -
EH TM03 680-760 (744) 680-800 (730) 810-940 (880) - - 620-760(680) - (740) -
SH TM04 750-840 (814) - - - 890-990 (940) - - - (840)
ESH TM04S 710-830 (785) - - - 930-1030 (980) - - - 840-940 (880)
XSH   - - - 970-1090 (1030) - - - -
USH   - - - 970-1090 (1030)
TD:1070-1190 (1130)
- - - -
0.2% Yield Strength (MPa) O   - - - - - - - -
1/4H   - - - - - 370-500 (480) - -
1/2H TR02 550min (575) 520-670 (610) 690-830 (760) 695-835 (765) - - - - -
H TM02 585min (644) 580-730 (660) 740-880 (810) 775-915 (845) - 540-680 (610) 570-700 (650) - -
EH TM03 655min (710) 640-790 (720) 790-930 (860) - - 600-740 (670) - (710) -
SH TM04 740min (800) - - - 860-960 (910) - - - (820)
ESH TM04S 700min (772) - - - 900-1000 (950) - - - 810-910 (850)
XSH   - - - 940-1060 (1000) - - - -
USH - - - - - 940-1060 (1000)
TD:1040-1160 (1100)
- - - -
Elongation (%) O   - - - - - - - -
1/4H   - - - - - 10min (17) - -
1/2H TR02 6.0min (10.0) 5min (8.0) 3min (6.0) 3min (7.0) - - - - -
H TM02 10.0min (13.0) 3min (6.0) 2min (4.0) 1min (2.0) - 5min (12) 2min (8) - -
EH TM03 5.0min (9.0) 1min (4.0) 1min (2.0) - - 2min (5) - (3) -
SH TM04 1.0min (3.0) - - - 1.0min (3.0) - - - 1.0min (3.0)
ESH TM04S 1.0min (3.8) - - - 1.0min (2.5) - - - 1.0min (2.0)
XSH   - - - 1.0min (2.0) - - - -
Vickers Hardness (Hv) O   - - - - - - - -
1/4H   - - - - - 160-210 (180) - -
1/2H TR02 180-220 (204) 160-230 (190) 200-270 (230) 215-285 (250) - - - - -
H TM02 190-240 (215) 170-240 (200) 210-280 (245) 250-320 (285) - 160-220 (200) 180-220 (200) - -
EH TM03 200-250 (235) 200-270 (220) 230-300 (260) - - 170-230 (210) - (230) -
SH TM04 225-275 (248) - - - 250-310 (280) - - - (250)
ESH TM04S 210-260 (246) - - - 265-325 (295) - - - (270)
XSH   - - - 285-350 (325) - - - -
USH - - - - 285-350 (325) - - - -
  • Standard specs. (Typical values)

Bend Formability

Copper Alloy Name C7025 NKC164 NKC286 NKC286S NKC388 NKC164E NKC4419 NKC4820 NKC1816
Minimum Bend Radius / t
Badway
1/2H TR02 4.0 0.0 0.0 0.0 - - 1/4H : 0.0 - -
H TM02 0.0 0.0 0.5 1.0 <t=0.08mm> - 0.0 0.7 - -
EH TM03 1.0 1.5 1.7 - - 0.2 -   -
SH TM04 5.0 - - - 1.0 - - -  
ESH TM04S 1.0 <t=0.1mm> - - - 3.0 - - -  
  • Bad way 90°W-shape Bending Width=10mm
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