Rahul Sharma (Editor)

Alumel

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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.

Contents

Physical Properties

  • 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)

    • Mechanical Properties

  • 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 Properties

  • 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.

    References

    Alumel Wikipedia
    (Text) CC BY-SA