Alumel

Alumel is an alloy consisting of approximately 95% nickel, 2% aluminium, 2% manganese, and 1% silicon. This magnetic alloy is used to make the negative conductors of ANSI Type K (chromel-alumel) thermocouples and thermocouple extension wire. Alumel is a registered trademark of Concept Alloys, Inc.

Properties of Alumel (95% Ni, 2% Al, 2% Mn, 1% Si)
Electrical resistivity 0.294 μΩ m
Temperature coefficient 23.9×10−4 K−1
Curie point 152 °C
Density 8.61 g cm−3
Melting point 1399 °C
Tensile strength (annealed) 586 MPa
Tensile strength (stress relieved) 1030 MPa
Tensile strength (hard) 1170 MPa
Coefficient of thermal expansion 12×10−6K−1 at 20 °C
Specific heat 0.523 J g−1 K−1
Thermal conductivity 29.7 W m−1 K−1
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