- Grade / Alloy
- Alloy 52
- EN / W.Nr.
- 2.4478
- AISI / SAE
- —
- UNS
- N14052
- Family
- Controlled expansion
Chemical composition
Chemical composition
Typical compositionTypical composition of the principal alloying elements; not a complete acceptance analysis.
| Element | Content (% by mass) |
|---|---|
| NiNickel | 51 |
| FeIron | 49 |
Values describe the grade, not the analysis of a specific batch. The applicable product specification and material certificate determine acceptance. A dash does not mean zero.
An alloy for expansion matching
2.4478 belongs to the iron-nickel alloys used for controlled expansion. Its role centres on how much the metal expands and contracts with temperature. This matters in electronic parts joined to glass. Even in a small connection, different movements can affect the interface, making the physical behaviour of the metal directly relevant to the function of the component.
Its role within a joint
In glass-to-metal feedthroughs, glass can provide electrical insulation or closure while metal forms the electrical connection or mechanical portion. If they expand at very different rates, stress develops at their interface. Expansion alloys such as 2.4478 support compatibility with suitable glass. The key is movement matched to the joined material, rather than low expansion alone.
Its place in the iron-nickel family
The iron-nickel family includes many specialised alloys with closely spaced nickel contents. Composition changes also affect thermal dimensional movement. Alongside connection alloys such as Alloy 42, Ni48 and Kovar, 2.4478 is an option identified by its own material number. Different glasses and temperature intervals explain the need for different expansion responses.
Wire and connection geometries
Electronic feedthroughs and glass-sealed connection elements illustrate the applications of this alloy family. Wire and rod can form the metal portion. The glass type and geometry of the finished connection also affect expansion compatibility. These components typically combine an electrical function with physical compatibility between materials rather than prioritising high mechanical loads.
Typical application areas
Glass-to-metal seals, electronic connection elements.
Product and cutting options
Relevant product forms for this material are listed below. Availability varies with grade and dimensions.