Corson Alloys

NKC286S ― Corson Alloy with high bend formability

High Strength Corson Alloy for Electronic Parts
(UNS Alloy No. C64728)


NKC286S is a Corson alloy that maintains the high strength and high electrical conductivity of NKC286 while further improving bend formability. This enhancement compared with NKC286 alloy makes NKC286S better suited to difficult bending work at small bend radius.
Another advantage of NKC286S is its lower modulus of elasticity (110 GPa) than conventional Corson alloys (123-131 GPa), making it the right choice for connector design demanding low modulus of longitudinal elasticity.
Conformant with JASO (Japanese Automobile Standards Organization) standard JC400, it is ideal for in-vehicle applications demanding particularly high strength along with excellent bend formability.
It is also available with reflow tin plating.


  1. 1.High electrical conductivity 41% IACS
  2. 2.Superior bend formability
  3. 3.Low modulus of longitudinal elasticity of 110 GPa (compared to 123-131 GPa for conventional Corson alloys)
  4. 4.Excellent stress relaxation resistance

Table 1. NKC286S chemical composition (wt%)

  Cu Ni Si Sn Zn
Standard composition Remainder 2.8 0.6 0.5 0.4

Table 2. Physical properties of NKC286S

Electrical conductivity 41 %IACS (@20℃)
Specific resistance 42.1 nΩ·m (@20℃)
Thermal conductivity 165 W/mK
Linear expansion coefficient 17.4 ×10-6/K (20 to 300℃)
Modulus of elasticity 110 GPa
Density 8.87 g/cm3

Table 3. Mechanical properties of NKC286S (upper: typical values, lower: specification range)

Temper Tensile strength
Yield strength
Vickers hardness
1/2H 800
H 880

Table 4. Bend formability of NKC286S
(test piece shape: thickness × 10 mm wide × 30 mm long)

Temper MBR/t
Good way Bad way
Thickness 0.18 mm
0 0
Thickness 0.08 mm
0 1
  • MBR/t:Minimum Bend Radius without cracking / thickness
  • Note that all numerical values shown are typical values.
    Please inquire about bend formability of different thicknesses.
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