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Corson Alloys

NKC4820 ― High Conductivity Corson Alloy

High Conductivity Corson Alloy NKC4820
(UNS Alloy No. C64810)

Overview

There is increasing demand for connector alloys offering the strength of existing alloys along with high electrical conductivity, reflecting the trend toward more compact devices and quick charging. Our NKC4820 alloy, with its excellent balance among strength, electrical conductivity, and bend formability, was developed in answer to this demand. It is ideal for use where connectors for in-vehicle electronics, consumer electronics, or information devices must withstand particularly high current.

Features

  1. 1.High electrical conductivity 60% IACS: Higher electrical conductivity than conventional Corson alloys
  2. 2.High Yield strength of 750 MPa
  3. 3.Excellent bend formability (MBR/t = Minimum bend radius/Thickness = 0 bad way, thickness ≦ 0.1 mm)
  4. 4.Superior stress relaxation resistance (stress relaxation rate less than 20% at 150℃, 1,00 hours)

Table 1. NKC4820 chemical composition (%)

Cu Co Ni Si
Standard composition Remainder 1.6 0.5 0.48
  • Note that all numerical values shown are typical values.

Table 2. Physical properties of NKC4820

Electrical conductivity 60 %IACS (@20℃)
Specific resistance 28.7 nΩ·m (@20℃)
Thermal conductivity 245 W/mK
Linear expansion coefficient 17.6 ×10-6/K (20 to 300℃)
Modulus of elasticity 120 GPa
Density 8.86 g/cm3
  • Note that all numerical values shown are typical values.

Table 3. Mechanical properties of NKC4820

Temper Tensile strength (MPa) Yield strength (MPa) Elongation (%) Vickers hardness (Hv)
EH 740 710 3 230
  • Note that all numerical values shown are typical values.

Table 4. Bend formability of NKC4820
(90° W bend test, test piece shape 0.08 mm thick × 10 mm wide × 30 mm long)

Temper MBR/t
Good way Bad way
EH 0 0
  • 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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