Corson Alloys

NKC388

NKC388
Copper Alloy for High End Connectors
(UNS Alloy No. C70252)

Overview

NKC388 alloy maintains the balance among strength, electrical conductivity, and bend formability of conventional Corson copper alloys, while succeeding in raising the toughness to a new level.

Table 1. NKC388 chemical composition (%)

  Cu Ni Si Mg Mn
Standard composition Remainder 3.8 0.8 0.1 0.13

Table 2. Physical properties of NKC388

Temper SH ESH XSH USH  
Electrical conductivity 38 34 %IACS (@20℃)
Specific resistance 45.4 50.7 nΩ·m (@20℃)
Thermal conductivity 160 143 W/mK
Modulus of elasticity 123 L.D. : 123
T.D. : 135
L.D. : 120
T.D. : 140
GPa
Linear expansion coefficient 17.6 ×10-6/K (20 to 300℃)
Density 8.82 g/cm3

Table 3. Mechanical properties of NKC388
(upper: typical values, lower: specification range)

Temper Tensile strength
(MPa)
Yield strength
(MPa)
Elongation
(%)
Vickers hardness
(Hv)
SH 940
(890-990)
910
(860-960)
3
(1min)
280
(250-310)
ESH 980
(930-1030)
950
(900-1000)
2.5
(1min)
295
(265-325)
XSH 1030
(970-1090)
1000
(940-1060)
2
(1min)
325
(285-350)
USH L.D. : 1030
(970-1090)
L.D. : 1000
(940-1060)
L.D. : 2.0
(1min)
325
(285-350)
T.D. : 1130
(1070-1190)
T.D. : 1100
(1040-1160)
T.D. : 2.0
(1min)

Correlation between Yield strength and bend formability

  • Test piece shape: thickness × 10 mm wide × 30 mm long
    For reference purpose only. They are observed values, not guaranteed values.

Stress relaxation resistance

  • For reference purpose only. They are observed values, not guaranteed values.
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