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An alloy containing 94% nickel, 2% aluminum, 3% chromium, and 1% silicon; used to form the chromel-alumel thermocouple.



an alloy used in pyrometry as the negative ther-moelectrode of the Chromel-Alumel thermocouple and also as a compensation conductor.

The chemical composition of Alumel is 1.8–2.5 percent aluminum, 0.85–2.0 percent silicon, and 1.8–2.2 percent manganese; the remainder is nickel and cobalt. The cobalt is present as an impurity of nickel and, to ensure the required value of the thermoelectric force, its content must be within the range of 0.6–1.0 percent. Thermocouples with Alumel are used in measuring temperatures up to 1000°C. On prolonged exposure at above 1000°C, a change in thermoelectric force becomes very noticeable. Alumel alloys have been developed and used which contain 0.06 -0.1 percent zirconium or 0.06 percent zirconium plus 0.005–0.03 percent boron and other metals. Such alloying of Alumel substantially increases its ductility (at temperatures of 600–1100°C) and durable strength (at temperatures of 700 -900°C), as well as improving the stability of its thermoelectric force at temperatures up to 1250 -1300°C.


Berkovskii, I. Ia., and A. G. Kolokolova. Nikelevye splavy.
Moscow-Leningrad, 1941. Popov, M. M. Termometriia i kalorimetriia, 2nd ed. Moscow, 1954.
Smiriagin, A. P. Promyshlennye tsvetnye metally i splavy, 2nd ed. Moscow, 1956.
“Issledovanie splavov dlia termopar.” Trudy instituta “Giprots-vetmetobrabotki,” 1964, vol. 22; 1967, vol. 25.


References in periodicals archive ?
The thermocouples used are of K type, chromel (+), alumel (-) alumel, and the measurement field are -50 .
Inconel sheathing on the thermocouple leads provides a close match to the thermal coefficient of expansion of the chromel and alumel wires, providing for a long thermal life cycle for the product.
Tenders are invited for Supply Of Chromel Alumel Type Thermocouple
Limited Tenders are invited for Procurement Of Duplex Chromel - Alumel Type -K Thermocouple Of Length 1250 Mm For Stage-1.
Limited Tenders are invited for Type-A, Chromel Alumel ( Kx Type)