Alumel is an alloy consisting of approximately 95% nickel, 2% manganese, 2% aluminium and 1% silicon. This magnetic alloy is used for thermocouples and thermocouple extension wire. Alumel is a registered trademark of Concept Alloys, Inc.
Electrical resistivity: 0.294 μΩm
Thermal conductivity: 30 W/m/K
Curie point: 152 °C
Density: 8.61 g/cm³ (0.311 lb/in³)
Melting point: 1399ºC (2550ºF)
Tensile strength at break (annealed): 586 MPa (85000 psi)
Tensile strength at break (stress relieved): 1030 MPa (150000 psi)
Tensile strength at break (hard): 1170 MPa (170000 psi)
Thermal expansion co-efficient (@ 20ºC/68ºF): 12 µm/m°C (6.67 µin/in°F)
Thermal conductivity: 29.7 W/mK (206 BTU in/hr.ft².°F)
In thermocouples, alumel is often used together with chromel to form type K thermocouples.