Description

Cold-drawn wire from the alloy Cr*3Al5 is used forheating and resistance elements. Fechral enclose highelectric resistance and low temperature coefficient ofthe electric resistance and high strain&sensitive, highductility and high heatresistance. This resistancealloy is used at temperature to ***0 °C in oxidative,sulphur atmospheres and others. High oxidation and corrosion stability of the mostcommon manufacturing aggressive mediums was conditioned by the nature chemically inert, thick superfi&cial protective oxide layer on basis of Al2О3. Nickelalloys as against, in contrast to fechral, for example, neither be used in sul&fur mediums not СA-containing atmosphereat **0&**0°C, becauseat simultaneous oxida&tion and carburetion, on theirs surfaces havedestruction protectiveoxide with combining "green mould".

Field of applications

Electric heating of the furnaces are for all branches ofindustry, household appliances etc. Used in high tem&perature electric furnaces, firing furnaces and fire dry&ing furnaces, different electric heaters havingenhanced, creep resistance, ductility, (including afterlong exploitation), stability of the form and increasedterm of exploitation.Foreign fechrales have higher maximum temperatureof operation and more durable compare to nichromeand ferrochrome. Moreover, the fechrals have morestable temperature coefficient of electric resistance,let keep the heating temperature.

Technical information

Cold-drawn wire from the alloy Cr*3Al5 is produced insoft annealed condition diameter 0.***0 mm accord&ing to DIN ****0. Limiting deflections in diameter ofthe wire not exceed ±0.**0 mm, and the oval of thewire is not more than half of the field tolerance indiameter. Chemical composition of alloy and typical mechanicaland physical properties of the alloy Cr*3Al5 are in thetable. Durability of the alloy, tested the method G, at tem&perature ***0°C, compose not less **0 hours.

Advantages

• High temperature of exploitation — to***0 °Ð¡,against ***0 °Ð¡ for Cr*0Ni*0. 
• High melting temperature & ***0 °Ð¡, against ***0 °Ð¡for Cr*0Ni*0. 
• Term of employment in 2&4 times longer thannichrome. Not high density — 7.*5 g/сm3 against 8.4g/сm3for Cr*0Ni*0, let economize to*8% on theweight. 
• The best corrosion — resistance in the air, vacuum,argon, sulfur and carbon content mediums, watersteam. 
• High yield strength, let use the wire minimum diameter in connection less changed square cross&sectionat the coiling. 
• High specific resistance — 1.*9 Оm·mm2/m against1.*2 for Cr*0Ni*0. 
• Electric resistance does not depend from differentforms of heat influence and cold warping. 
• Unique correlation of tensile strength or yieldstrength (~0.5), let use this sphere elastoplasticdeformation.