Corson Alloys
Corson Alloy NKC388 (UNS Alloy No. C70252)
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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