The surface temperature of the component itself in the dry air is about 100 degrees higher than the furnace temperature under normal circumstances. Therefore, when designing the component, pay attention to its use temperature. When the use temperature exceeds a certain limit, the oxidation of the component itself will accelerate and heat resistance Decrease in performance, especially the iron-chromium-aluminum heating wire components, the result is: easy to deform, collapse, and even break, and shorten the service life.
Under normal conditions, the maximum use temperature of the component should be no less than 3mm, and the thickness of the flat strip should not be less than 2mm. Iron-chromium-aluminum heating wire, nickel-chromium heating wire and other series of electric heating alloys are different due to their chemical composition. The oxidation resistance and the resistivity are different, which determines the use temperature and the length of the service life. The element that determines the resistivity in the iron-chromium-aluminum electric heating alloy data is the element AL, and the component that determines the resistivity in the nickel-chromium electric heating alloy data is the element Ni. . Under high temperature conditions, the oxide film formed on the surface of the alloy components will also age and be destroyed from time to time. The internal elements of its components are costly from time to time. Such as ALNi, etc., thereby shortening the service life. Therefore, when selecting the nickel-chromium wire diameter, a large-sized wire or a thicker flat belt should be used. The maximum use temperature of the component also has a considerable relationship with the component wire diameter. The use temperature and service life of components are often affected by the presence of corrosive atmosphere. The corrosive atmosphere in the furnace is also related to the maximum operating temperature of the components.
Customers must reasonably choose the required products or domestic heating wires or imported heating wires according to their own equipment needs, so that they can be value for money. Electric heating wire has a wide range of uses. The quality of heating wire products has a direct relationship with the manufacturer. Care must be taken in product selection.
