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Corson Alloy

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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 information-rich society.

C7025 NKC164E NKC4419 NKC388 NKC286 NKC164 NKC286S

C7025 Chemical compositions Cu-3.0Ni-0.65Si-0.15Mg
Highlights Global standard Corson alloy designed for high efficiency lead frames and connectors
Applications Connectors, Lead frames, CPU sockets

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NKC164 Chemical compositions Cu-1.6Ni-0.4Si-0.5Sn-0.4Zn New
Highlights Corson alloy desigend for electric components with high bend formability
Applications Wire harness, Connectors

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NKC286 Chemical compositions Cu-2.8Ni-0.6Si-0.5Sn-0.4Zn New
Highlights Corson alloy desigend for in-vehicle electric components with high mechanical strength
Applications Connectors, Wire harness

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NKC286S Chemical compositions Cu-2.8Ni-0.6Si-0.5Sn-0.4Zn New
Highlights Lower Young's modulus alloy of NKC286
Applications Connectors, Wire harness

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NKC388 Chemical compositions Cu-3.8Ni-0.8Si-0.1Mg-0.13Mn New
Highlights Corson alloy designed for high efficiency connectors
Applications Connectors, Switches

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See Chemical compositions and properties

Chemical compositions and properties

Copper Alloy Name Cu-Ni-Si
C7025 NKC164 NKC286 NKC286S NKC388
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 : 3.8
Si : 0.8
Mg : 0.1
Mn : 0.13
Physical Properties Specific Gravity (g/cm3) 8.82 8.87 8.87 8.87 8.82
Modulus of Elasticity (MPa) 131,000 127,000 127,000 110,000 123,000
(XSH :
L.D.123,000
T.D.135,000)
(USH :
L.D.120,000
T.D.140,000)
Electrical Conductivity (%IACS @20℃) 45
(TM04S : 48)
43 41 41 38
(ESH、XSH、USH : 34)
Poisson's Ratio 0.33 0.33 0.33 0.33 0.33
Mechanical Properties

*Standard specs.
Tensile Strength (MPa) O - - - - - -
1/4H - - - - - -
1/2H TR02 607-726 560-680 710-840 - -
H TM02 650-740 620-740 760-890 730-870 -
EH TM03 680-760 680-800 810-940 800-940 -
SH TM04 750-840 - - - 890-990
ESH TM04S 710-830 - - - 930-1030
XSH - - - - - 970-1090
USH - - - - - L.D. : 970-1090
T.D. : 1070-1190
0.2% Yield Strength (MPa) O - - - - - -
1/4H - - - - - -
1/2H TR02 550min 520-670 690-830 - -
H TM02 585min 580-730 740-880 695-835 -
EH TM03 655min 640-790 790-930 775-915 -
SH TM04 740min - - - 860-960
ESH TM04S 700min - - - 900-1000
XSH - - - - - 940-1060
USH - - - - - L.D. : 940-1060
T.D. : 1040-1160
Elongation (%) O - - - - - -
1/4H - - - - - -
1/2H TR02 6min 5min 3min - -
H TM02 10min 3min 2min 3min -
EH TM03 5min 1min 1min 1min -
SH TM04 1min - - - 1min
ESH TM04S 1min - - - 1min
XSH - - - - - 1min
USH - - - - - 1min
Vickers Hardness (Hv) O - - - - - -
1/4H - - - - - -
1/2H TR02 180-220 160-230 200-270 - -
H TM02 190-240 170-240 210-280 215-285 -
EH TM03 200-250 200-270 230-300 250-320 -
SH TM04 225-275 - - - 250-310
ESH TM04S 210-260 - - - 265-325
XSH - - - - - 285-350
USH - - - - - 285-350
Bend Formability

*Badway90°W bend
Width=10mm data
Minimum Bend Radius / t Badway 1/2H TR02 4.0 0.0 0.0 - -
H TM02 0.0 0.0 0.5 0(t=
0.18mm)
-
EH TM03 1.0 1.5 1.7 1.0(t=
0.08mm)
-
SH TM04 5.0 - - - 1.5
ESH TM04S 1.0 (t=
0.1mm)
- - - 1.0 (t=
0.08mm)