Titanium Copper Alloy

NKT322

NKT322
GIGALLOY® High Strength Copper Alloy for Connectors (UNS Alloy No. C19910)

Overview

NKT322 GIGALLOY® is a proprietary alloy we developed by adding small amounts of iron to titanium copper and further improving processes. It is notably stronger than ordinary titanium copper and has better bend formability.

Features

A beryllium-free ultra-high-strength copper alloy
Strength and bend formability equal to or greater than mill-hardened beryllium copper: In wide use as an alternative product
The highest level of stress relaxation resistance among copper alloys: Maintains contact force at high temperatures

Table 1. NKT322 chemical composition (%)

  Ti Fe Cu+Ti+Fe
Standard composition 2.9~3.4
(3.2% target)
0.17~0.23 ≧99.5

Table 2. Physical properties of NKT322

Electrical conductivity 12 %IACS (@20℃)
Specific resistance 144 nΩ·m (@20℃)
Thermal conductivity 66.79 W/mK
Linear expansion coefficient 18.0 ×10-6/K (20 to 300℃)
Modulus of elasticity 120 GPa
Density 8.70 g/cm3

Table 3. Mechanical properties of NKT322

Temper Tensile strength
(MPa)
Yield strength
(MPa)
Elongation
(%)
Vickers hardness
(Hv)
H Typical value 950 850 18 300
Specification range 900-1000 800-900 12min -
EH Typical value 970 900 15 310
Specification range 920-1020 850-950 10min -
SH Typical value 1020 950 10 320
Specification range 970-1100 900-1000 6min -
ESH Typical value 1070 1000 5 340
Specification range 1010-1200 950-1050 3min -
  • Standard values are shown for tensile strength, Yield strength, and elongation, while typical values are given for Vickers hardness.

Correlation between Yield strength and bend formability

  • Test piece shape: 0.1 mm thick × 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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