ALLOY 36, 42, 48 are nickel-iron controlled expansion alloys with high magnetic permeability.
JLC Electromet
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ALLOY 36, 42, 48 - Controlled-Expansion and Glass-Sealing AlloysALLOY 36, 42, 48 are nickel-iron controlled expansion alloys with high magnetic permeability.
Alloy 36 has near zero coefficient of thermal expansion at room temperature and till 100°C. It is used in instrumentation and in thermostats. It is also used as bimetallic strip in cryogenic engineering and laser components.
Alloy 42 has low expansion till 300°C and it matches the expansion of soft glass. Used in lead-in-wires for electronic applications and for the core of Dumet wire (glass sealing part in lead-in-wires for electric lamps). It is used in glass sealing applications in microelectronic components and vacuum devices.
Alloy 48 has expansion that matches soda-lead and soda-lime glass. Used as leads for electronic applications. It is also used in thermostats for industrial applications upto 450°C.
Controlled-Expansion and Glass-Sealing Alloys are supplied in the following conditions:
| Alloy | Werkstoff Nr | UNS Designation | ASTM |
|---|---|---|---|
| Alloy 36 | 1.3912 | K 93600 | B 753 |
| Alloy 42 | 1.3917 | K 94000 | F 29 |
| Alloy 48 | 1.3922 | K 94800 | F 30 |
| Alloy 36 | Alloy 42 | Alloy 48 | |
|---|---|---|---|
| Nickel | 36% | 42% | 48% |
| Iron | Balance | Balance | Balance |
Wires: 10mm diameter to 0.15mm diameter. (0.393” diameter to 0.0059” diameter).
Strips: Width 0.4 - 100 mm, Thickness: 0.10 mm and above.
| Thermal Expansion: Mean Coefficient x 10-6 K/ºC |
Alloy 36 | Alloy 42 | Alloy 48 |
|---|---|---|---|
| 20-100 | 1.5 | 5.3 | 8.5 |
| 20-200 | 2.6 | 5.3 | 8.6 |
| 20-300 | 5.5 | 5.3 | 8.7 |
| 20-400 | 8.4 | 6.2 | 8.8 |
| 20-500 | 10.1 | 8.0 | 9.1 |
| Alloy | Electrical Resistivity µΩ-cm |
Tensile Strength N/mm² |
Hardness HV |
Density g/cm³ |
|---|---|---|---|---|
| Alloy 36 | 80 | 490 | 150 | 8.11 |
| Alloy 42 | 61 | 490 | 140 | 8.11 |
| Alloy 48 | 47 | 520 | 150 | 8.20 |
Note: Other Grades of controlled expansion and glass sealing alloys are also available. Please contact us for more information.
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