1.Chemical Composition:
It mainly consists of 40% - 45% nickel (Ni), with the balance being copper (Cu). Additionally, it contains small amounts of manganese (Mn) ≤2.25%, iron (Fe) ≤0.75%, silicon (Si) ≤0.25%, cobalt (Co) ≤0.25%, carbon (C) ≤0.10%, and sulfur (S) ≤0.015%.
2.Physical Properties
It has a density of 8.88 g/cm³, a melting point of approximately 1280 °C (2335 °F), a thermal conductivity of 21.0 W/m·K at 21 °C, and an electrical resistivity of 0.294 µΩ·m at 21 °C. Its mean coefficient of thermal expansion varies with temperature; for example, it is 7.6×10⁻⁶ in/in/°F in the range of 70 - 200 °F.
3.Mechanical Properties:
In the annealed state, its ultimate tensile strength is 345 - 414 MPa (50 - 60 ksi), yield strength (0.2% offset) is 207 - 276 MPa (30 - 40 ksi), elongation is 40% - 51%, and hardness is RB 60 - 75
4.Features:
It has a very low coefficient of electrical resistivity and good resistance to a variety of corrosive environments. It can be easily welded by gas tungsten arc welding (GTAW) or resistance welding
5.Applications:
Due to its low thermal expansion coefficient and stable electrical properties, it is mainly used in precision electrical components, such as wire - wound precision resistors and bimetal contacts.It is also used in resistance heaters, circuits, and some components that require dimensional stability and corrosion resistance in electronic equipment. In addition, it can be applied to some extent in marine engineering, chemical processing, oil and gas, power generation, aerospace, and other fields that require corrosion - resistant materials.
