Description

Cr*7Al5Y Cold drawn wire from the alloy Cr*7Al5Yused for the resistance elements and heaters.Cr*7Al5Y has excellent resistance to high electricalresistance and low temperature coefficient of electri&cal resistance (ТCER), low ТCER and a high strain&sen&sitivity, good plasticity and excellent heat&resistance.The alloy has a high maximum working temperature(to ***0 °Ð¡) and 2&4 times more durable in compari&son with the Nichrome at exploitation at high temper&atures (***0&***0 °Ð¡) in oxidation, sulfur and othersenvironments. The alloy exhibits stable ТCER that letsupport the temperature of heater systems. UsingCr*7Al5Y, having less specific gravity and higher spe&cific resistance in compare with Nichrome that letreduce the weight of heating material in *0&*0% thesame length and diameter of the wire, and also haveresult more equal heating at the length. Reducing theweight results to cut costs by miniaturizing the lining,fixturing etc.

New technology of producing Cr*7Al5Y provides ithomogeneous structure, uniformity of protectiveoxide layer and high adhesion layer to the surface. Incombination with reduction of bases carbon to thelevel <0.*3%,is guaranteed the high wire plasticity,the absence inclination to intergranular high tempera&ture corrosion, high creep limit, and also oxide resist&ance, sulfidizing and carbonization, at high tempera&tures. High resistance to oxide and corrosion in themost common industrial, oxide, sulphur and othershostile environment, conditioned the nature of chemi&cal inert dense of the surface protective oxide layer onthe basis of Al2О3. Exellent Cr*7Al5Y properties arecharacterized that high&strength tape Al2O3 is gath&ered on the surface of the alloy serving as good insu&lator and prevent the corrosion more effective incompare to green rouge (Cr2O3), was having on thesurface of Nichrome. Fields of applicationsElectricheating of the furnaces are for all branches of indus&try, household appliances etc. Cr*7Al5Y used in hightemperature electric furnaces, firing furnaces and firedrying furnaces, different electric heaters. Havingenhanced, creep resistance, ductility, (including afterlong exploitation), stability of the form and increased term of exploitation.

Technical information

Cold-drawn wire from the alloy Cr*7Al5 is produced insoft thermally manufactured diameter 0.1&*0 mmaccording to DIN ****0. Limiting deflections in diam&eter of the wire not exceed ±0.**0 mm, and the ovalof the wire is not more than half of the field tolerancein diameter.

Chemical composition of alloy and typical mechanicaland physical properties of the alloy Cr*7Al5 are in thetable.

Durability of the alloy, tested the method G, at tem&perature ***0 °Ð¡, 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.*0 g/сm3 against 8.4g/сm3for Cr*0Ni*0, let economize to*8% on the weight. 
• The best corrosion — resistance in the air, vacuum,argon, sulfur and carbon content mediums, watersteam. 
• High yield strength, let use the wire minimum diame&ter in connection less changed square cross&sectionat the coiling. 
• High specific resistance — 1.*9 Оm·mm2/m against1.*2 for Cr*0Ni*0.