Low Controlled Expansion Alloy
DUMET: WIRE / RIBBON
These are nickel-iron based alloys that are required for applications where a hermetic seal is required between metal and glass or ceramic. They are also used for applications where a certain thermal expansion is required over a given temperature range. Examples of such applications are light bulbs, vacuum tubes, optoelectronics, etc.
Alloy 36
This grade exhibits near zero coefficient of thermal expansion from room temperature to 100 °C. It is used for applications that cannot tolerate any dimensional changes due to temperature changes. It finds use in precision laser measurement equipment, electronic devices, instrumentation, thermostats, and in antenna/aerial technologies. Another common usage is for making the low expansion part of bimetallic thermostats.
Range
| Range | |
|---|---|
| Sheet | 4 – 400 mm |
| Round bar | 4 – 500 mm |
| Square bar | 70 – 400 mm |
| Flat bar | 250×250 mm |
| Sheet & Coil | 0.025 – 3.175 mm |
| Wire | 0.15 – 10 mm |
Alloy 42
has a constant low rate of thermal expansion up to temperatures approaching 350 °C. The thermal coefficient of expansion of this alloy matches that of soft glass. As a result, it is used for glass-sealing applications in microelectronic components and vacuum devices. Alloy 42 is also used as the core of Dumet wire, which forms the glass-sealing component of the lead-in-wires used in electric light bulbs. This alloy is also used for thermostats and thermo switches.
Alloy 48
has a thermal expansion coefficient which matches that of soda-lime glass. It is widely used for electric wiring in glass-to-metal connections. It is also used in thermostats for industrial applications up to 450 °C.
Alloy 52
is also a glass-to-metal sealing alloy that is used in compact fluorescent lamps (CFL) and other electronic applications.
Alloy 54
is also a glass-to-metal sealing alloy that is used in compact fluorescent lamps (CFLs), special auto lamps, and other electronic applications.
Note: Other variants with customer specified Nickel content can also be manufactured. Please contact us for more details.
Specifications & Nominal Chemical Composition (%)
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| Alloy | Werkstoff Nr | UNS designation | ASTM | Ni | Fe |
|---|---|---|---|---|---|
| Alloy 36 | 1.3912 | K93600/K93603 | B753 | 36 | Balance |
| Alloy 42 | 1.3917 | K94100 | F29 | 42 | Balance |
| Alloy 48 | 1.3922 | K98000 | F30 | 48 | Balance |
| Alloy 52 | 2.4478 | N14052 | F30 | 52 | Balance |
| Alloy 54 | 2.4475 | – | – | 54 | Balance |
Nominal Physical, Electrical & Mechanical Properties (at room temperature)
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| Alloy | Density | Electrical Resistivity at 20°C | Tensile Strength | Elongation |
|---|---|---|---|---|
| g/cm³ | µΩ-cm | N/mm² | % at L0=100 mm | |
| Alloy 36 | 8.11 | 80 | 490 | 30 |
| Alloy 42 | 8.11 | 61 | 510 | 30 |
| Alloy 48 | 8.20 | 47 | 520 | 30 |
| Alloy 52 | 8.30 | 43 | 540 | 30 |
| Alloy 54 | 8.30 | 43 | 550 | 30 |
Mean Coefficient of Thermal Expansion in Annealed Condition (µm/m-°C)
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| Alloy | Temperature Range (°C) | ||||
|---|---|---|---|---|---|
| 20-100 | 20-200 | 20-300 | 20-400 | 20-500 | |
| Alloy 36 | 1.5 | 2.6 | 5.5 | 8.4 | 10.1 |
| Alloy 42 | 5.3 | 5.3 | 5.3 | 6.2 | 8.0 |
| Alloy 48 | 8.5 | 8.6 | 8.7 | 8.8 | 9.1 |
| Alloy 52 | 10.3 | 10.2 | 10.2 | 10.1 | 9.9 |
| Alloy 54 | 10.3 | 10.3 | 10.2 | 10.1 | 10.2 |