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Chromel is a representative of thermoelectrode alloys based on nickel (up to 91%) and chromium (up to 10%). The alloy is alloyed with iron, manganese, copper, silicon, cobalt. The total content of these impurities does not exceed 1.5%.
- Density of 8.71 g / cm 3 ;
- Melting point + 1500 ° C;
- Hot rolling of the alloy occurs at t ° + 1200 ° C;
- Annealing — at t ° 900 ° C;
- Specific resistance = 0,66 Ohmmm 2 / m;
Nickel gives the material heat resistance and corrosion resistance in an aggressive environment, due to the formation of a surface oxide film. Chromel is distinguished by a significant thermo-emf in contact with other materials. The increase in thermoelectromotive force with heating occurs almost rectilinearly from 0 to 1000 ° C. The magnitude of the thermoelectromotive force of the chromelium strongly depends on the cooling rate after annealing. The value of thermo-emf is lower the more rapidly the metal cools. When measuring t ° more than 600 ° C, the instruments give an error of 6%. With the artificial inhibition of the cooling of the alloy from 600 ° to 205 ° C, the thermoelectromotive force stabilizes and the accuracy of the readings increases.
Chromel is inert in reducing and oxidizing to t ° 1000 ° C, but a high percentage of nickel makes it sensitive to hot hydrogen and sulfur. On the surface a green coating forms, reducing the thermoelectric potential and increasing the fragility of the material. Wire-chromel, because of the nickel base, has a high cost.
Chromel wire is more popular than a tape or a circle. Such a wire is used in heating devices, thermocouples, rheostats, compensating wires. In thermocouples, chromel-alumel chromel is used as a positive electrode to t ° 1000 ° C. Since the electric potential grows linearly with increasing temperature, this greatly simplifies the calibration of pyrometers.
Supplied chromel in the form of: tape, wire Ø 0.1−12 mm or a circle with a cross section of up to 100 mm. To become more detailed with the products, to clarify its basic properties, you can place an order through our website www.vmc.com.ua/. The company «_" Ltd. presents an unlimited range of wire from chrome.
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Quality manufacturing with constant control of compliance with the requirements of technological discipline, absolute compliance of semi-finished products from the alloy chromel to all items of regulatory documentation, acceptable cost of products determines the great popularity of such material for the needs of modern production. Our company represents the entire assortment of thermocouple wire and provides constant attention to the needs of each customer, regardless of the volume of the order.