Economical doped alloys of new generation 3

Continuation of article, part 3:

Foreign fechrals have more high maximum working temperature and durability in comparison with nichrome and ferum- nichrome. Besides, they are characterised more stable temperature coеfficient of electric resistance, that let precision support heat temperature.

Table 3. Comparative service properties of the alloys with high electric resistance.

Characteristic	Fechral	Cr20Ni80	Cr20Ni30	Comment
Maxim.working temperature(TE) and duration of air exploitation (DE) at the temperature 1100 °C ( in comparative%)	(TE) max. =1400 °C, (ДE) =100%	(ТE) max. =1200 °C, (DE)=25%	(TE) max. =1150 °C, (DE)=20%	(DE) is inversely frequency of heating cycle and depend of the diameter of the wire.
Oxidative resistance at high temperatures	Good resistance makes for formation of protective oxide Al2O3	Protective oxide layer Cr2O3is less resistance	Protective oxide layer Cr2O3 is less resistance	Yttrium addition in the fechral harden the resistance to the fire scale content.
Sulfur content resistance in gas mediums	Good resistance makes for formation of protective oxide Al2O3	Protective oxide layer Cr2O3is less resistance	Protective oxide layer Cr2O3 is less resistance	Oxide covering Al2O3 hardens resistance of heating materials in SO2 and SO3 mediums.
Corrosion resistance in the humid air.	Better than nichromes have corrosion resistance in water steam flow.	At room temperature attack less than not oxidizing fechral.	At room temperature attack less than not oxidizing fechral .	Oxide covering Al2O3 hardens resistance of heating materials in SO2 and SO3 mediums. Steam insufflation reduce the tenure of employment of nickel content alloys much stronger.
High resistance at temperature exploitation.	Better than nichromes have corrosion resistance in water steam flow.	High exploitation resistance and creep strength in comparison with fechrals.	High exploitation resistance and creep strength in comparison with fechrals.	Only at high tensile loads.
Plastic properties after utilization.	The wire isn't used after second coiling.	Can be used for second coiling. Save plastic properties.	Can be used for second coiling. Save plastic properties.	Second coiling of any species of hogh resistance wire can be used in case of emergency.
Acid resistance	Organic acid resistance.	Organic and inorganic acid resistance.	Organic and inorganic acid resistance.	At exploitationin the mediums containing steams of inorganic acids (phosphorus, sulfur and others).

*Cited data are relative, because influence of air pollution, temperature cycles,mechanical loads, not to take into consideration.

** Commercial names of high resistance alloys.

High qualityconcerning inexpensive foreign fechrals offer large challenges for native consumers. So, fechral wires (especially doped yttrium) can be used as not only embed and closed spiral in ceramic and others matrix basis of household appliances and industrial firing equipment, but also in heat construction, hanging constructions (thermal fan, hair dryer, thermal guns, convection heaters).