Alloys of Nickel and chromium with high electrical resistance — CR20NI80 (nichrome) for many years traditionally manufactured heating elements for household appliances and industrial installations. But because of the high prices of these alloys and poor resistance to corrosion in sulfur vapor and sulfur oxides, carburizing, oxidizing gas, so often used in production on the world market pushed them fehrali.
Disadvantages of nicrmov
Alloys of Nickel and chromium with high electrical resistance — Narumov (they can contain up to 80% Ni) for many years traditionally manufactured heating elements for household appliances and industrial installations. But because of the high prices of these alloys and poor resistance to corrosion in sulfur vapor and sulfur oxides, carburizing, oxidizing gas, so often used in the production, pushed them on the world market fehrali (Fe-Cr-Al) alloy and economically ferrochrome Nickel (Fe-Ni-Cr). The share of the latter in the consumer sector of the alloys heat abroad reached almost 85% and continues to grow.
Why is domestic market oriented nichrome
There are several reasons. One of the main that the domestic outdated technology give unstable from batch to batch properties homoalanine alloys. Domestic fehrali prone to intercrystalline corrosion, high temperature embrittlement, rapid onset of signs of creep and sagging at high temperatures. Therefore, consumers often prefer expensive Nickel alloys: CR20NI80 H15N60 with better characteristics than domestic fehrali.
Advantages high quality feheley
Negative experience of use of the Russian feheley, makes consumers wary of high quality to foreign analogues. Meanwhile, modern technologies guarantee the homogeneity of the structure feheley, the continuity of the protective oxide layer and its «sticking» to the surface due to precise alloying with elements such as Al, Mn, Si. Zr, etc. Reducing the carbon content below 0.03%, which gives a high flexibility, eliminates the susceptibility to intercrystalline corrosion high temperature increases the creep strength and oxidation resistance, sulfur and its oxides, and carburization with a significant heating.
Feheley resistance to oxidation in aggressive industrial environments, provides a chemically inert, dense oxide protective surface layer based on Al203. Fehrali more resistant to organic acids and caustic alkalis, chloride pitting and crevice corrosion, chloride stress-corrosion cracking. In co-containing atmosphere Nickel alloys at 800−950°C due to simultaneous oxidation and carburization lose the protective surface layer of oxide and covered with so-called «green rot». Foreign fehrali more heat resistant and durable than nichrome and ferrochrome and have a more stable temperature coefficient of resistivity, which allows precision to maintain the temperature of the heating. In some cases it is advisable to use a preliminary oxidation fehrali.
High quality and relatively cheap foreign fehrali have an increased service life and high technology of production of heating elements. So, fehrali (especially with the addition of yttrium) is used not only for embedded and wound spirals on matrix basics of household electrical appliances and industrial equipment, but also in heaters suspension and tension-type (dryers, fan heaters, thermal guns, etc.).
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