About FeCrAl (Cr21Al4)
Iron-Chromium-Aluminum alloy FeCrAl (Cr21Al4) electric resistance heating element material has small temperature coefficient of resistivity and high operation temperature. It offers good stability at the elevated temperatures, particularly in air containing sulphur and sulphide. It offers maximum high operation temperature up to 1300C. Great oxidation and scaling resistance. High mechanical strength and good tolerability to stress and pressure levels at the elevated temperatures.
FeCrAl resistance heating alloy produces an adherent aluminum oxide layer also known as alumina. It resists the flow of current but offers good thermal conductivity. Hence it allows better flow of heat and prevents it to remain around the heating element to provide longer service life.
Resistors, heavy relay switches, electric furnaces, warm plates, mica elements in irons, quartz tube heaters, heating coils in industrial furnaces, hair dryers, toaster ovens, infrared dryers, glass top heaters, tubular elements for dishwaters, suspended coils, shielding material in ceramic glass top heaters and kilns
|Chromium||19 to 21 %|
|Aluminum||4 to 5 %|
|Specific resistance at 20oC micro-ohm-cm||135|
|Coefficient of resistance x 10(-4) ohms/ohm/oC at 20oC to 1100oC||1|
|Linear coefficient of expansion||15 x 10 (-6) for temperature from 20oC to 1000oC|
|Highest service temperature||1200oC|
|FeCrAl Wire||FeCrAl Wire Mesh||FeCrAl Heat Coil||FeCrAl Sintered Felt||FeCrAl Strip/Foil||FeCrAl Rod/Bar|
Heanjia Super Metals, America offers all above forms of FeCrAl Electric Resistance Heating alloy in all standard as well as custom specifications.