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Alumel wire NiMn3Al


Grade analogue W. Nr. Aisi Uns En Order
NMtsAK2-2-1 2.4122 NiMn3Al Buy from stock, view availability


Thermocouple alloy of alumel consists of nickel (94%), aluminium (max. 2,5%), mangan (to 2,2%), silicon (within 1,2%) and cobalt (1%), which is used for supporting a required thermoelectromotive force. To make special properties of an alloy, it has to be alloyed with boron (0,03%), zirconium (0,06%); as a consequence, a relatively new alloy is obtained.


Specific electrical resistance constitutes 0,32 Ohm-mm2/m, melting point — 1440 °C, a coefficient of linear thermal expansion is 13,7•10−6/°C, density is — 8,48 g/cm³, annealing temperature — 950 °C. Due to a huge containing of nickel in a composition, the properties are defined by their physical characteristics — heat resistance and resistance to corrosion in an aggressive environment. An enhancement of these properties achieves by adding alloying components. It allows stabilizing an index of thermal electromotive force, increasing an index of plasticity, providing a long-term strength and use of this alloy at a temperature up to 1300 °C.


An alloy is quite expensive due to a presence of pricey nickel in a composition. The main demerit is an exposure of devastating impact of sulfur when rising a temperature. It leads to embrittlement and corrosion. It can be fixed by increasing a percentage composition of silicon and at the same time by reducing a content of aluminium. Such changes enhance a running time of a thermocouple at a temperature more than 1000 °C.

Number Grade Material Size Rolles stock type Price
1 NiMn3Al alumel Ø 0,2−0,5 wire contractual
2 NiMn3Al ---«--- Ø 1,2−3,2 wire contractual
3 NiMn3Al ---«--- 1х60 mm stripe



Alloy is widely used in a pyrometry in a form of wire and strip for producing thermocouples (diameter of a wire is 0,2 — 3,2 mm), heating controllers and compensating lead wires. A thermocouple consists of electric conductor fumes, that are soldered in one end and placed in oriented environment («hot junction»). Then, the exposed ends are going to be placed into a thermostatic regulator (so-called cold junction).

Thanks to alloyage, a thermocouple of this kind can stand a short-term effect of temperature up to 1300 °C working in an aggressive environment. Alumel compensating lead wires are intended for accessing transducers and for reducing an error in indication. By virtue of small sizes and high readability, alumel-chromel transducers are used in automobile construction, aerospace engineering, in physical and chemical laboratories.

Delivery of alloy grade NiMn3Al conducts in the following way:

A rod (with a help of cross-section 12,0 — 100,0 mm);
A wire (with a help of cross-section 0,10 — 12,00 mm);
A strip (0,1−5,0 mm of thickness, 3−600 mm of wideness);

Percentage composition:

Fe Co Mn Impurities C Mn Al Ni+Co Si
≤0.3 0.6 — 1.2 1.8 — 2.7 0.7 ≤0.1 1.8 — 2.7 1.6 — 2.4 91.5 — 95.15

0.85 — 1.5

Physical characteristics of NiMn3Al at a temperature 20 °C

Properties Magnitude
Hardness, hard alloy metal HB 10 -1 equals 250 — 300 MPа
Melting point: around 1440°C
Firmness, soft alloy HB 10 -1 equals 130 MPa
Annealing temperature: 950°C
Temperature of hot working: 1050 — 1280°C

Alumel wire NiMn3Al supplier

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«Auremo» alumel wire NiMn3Al supplier implements rolled-metal products throughout the European market by wholesale. The terms of delivery take a minimum of time. Here you can buy alumel wire NiMn3Al for an affordable price. We are working with experienced managers; they are the experts of modern marketing who can swiftly help to buy alumel wire NiMn3Al of any grade. Introduced goods in stock are certified. In this segment, «Auremo» company is a profitable supplier of fecral. A quality complies with GOST (all-Union State Standards) and International Standards. A price depends on an order quantity and additional conditions of supply. Alumel wire NiMn3Al price is privileged for wholesale buyers. «Auremo» company offers to make purchases by wholesale. Today there is an affordable price from a supplier.