What is the main purpose of high-temperature heating wire? What are its advantages and disadvantages?
Iron-chromium aluminum, nickel-chromium electric heating alloy its oxidation resistance is generally strong, but because the furnace contains a variety of gases, such as air, carbon atmosphere, sulfur atmosphere and hydrogen, nitrogen atmosphere, etc., these gases have an impact on the components under high temperature use, although a variety of electric alloys are oxidation treatment before leaving the factory, but in transportation, winding, installation and other links will cause component damage to a certain extent, and reduce the service life, in order to extend the service life, customers are required to pre-oxidize before use, The method is to heat the installed electric alloy element in dry air to 100-200 degrees lower than the allowable high use temperature of the alloy, keep warm for 5-10 hours, and then slowly cool with the furnace.
Pros and cons
1. The main advantages and disadvantages of iron-chromium-aluminum alloy series: advantages: iron-chromium-aluminum electric heating alloy has a high use temperature, high use temperature up to 1400 degrees, (0Cr21A16Nb, 0Cr27A17Mo2, etc.), long service life, high surface load, good oxidation resistance, high resistivity, cheap price, etc. Disadvantages: mainly low high temperature strength, with the increase of use temperature its plasticity will become larger, components are easy to deform, not easy to bend and repair.
2. The main advantages and disadvantages of nickel-chromium electric heating alloy series: advantages: high temperature strength is higher than iron chromium aluminum, not easy to deform under high temperature use, its structure is not easy to change, plasticity is better, easy to repair, its high emissivity, non-magnetic, strong corrosion resistance, long service life, etc. Disadvantages: Due to the use of nickel metal materials, the price of this series of products is several times higher than that of iron chromium aluminum, and the use temperature is lower than that of iron chromium aluminum.
