Electric furnace heating wire belongs to the more common type of electric alloy wire. The advantage of it is that the use of high temperature, good resistance to oxidation, the disadvantage is that in the working state, it is prone to oxidation reaction, and will produce visible light to reduce heat efficiency, but overall, the electric wire as a heating material in production and life The use is very extensive.
Electric furnace heating wire is mainly divided into iron-chromium alloy electric furnace wire and nickel-chromium alloy electric furnace wire. The iron-chromium alloy electric furnace wire is an alloy material of ferrite, and the electric wire of nickel-chromium alloy is austenitic alloy material. In addition to the above two materials, there are tungsten wire, molybdenum wire, etc., which are generally used only in special occasions.
1. Characteristics of Iron-Chromium Aluminum Electric Wire
The iron-chromium-aluminum wire has a high operating temperature and a long service life. Its maximum operating temperature can reach 1400°C, and it can meet the heating requirements of electric heating equipment in industrial production.
Iron-chromium-aluminum furnace wire has good anti-oxidation properties, which will generate aluminum oxide film after oxidation. This layer of aluminum oxide film has a good protective effect on the iron-chromium-aluminum furnace wire and can improve chemical resistance and resistivity of the iron-chromium-aluminum furnace wire.
The allowed load on surface of the iron-chromium-aluminum is larger than that of the nickel-chromium alloy wire, but proportion of it is less than nickel-chromium alloy wire. In terms of price, the iron-chromium-aluminum is lower than the nickel-chromium alloy wire, with more cost-effective.
2. Characteristics of nickel-chromium electric furnace wire
Although the maximum working temperature of nickel-chromium wire is lower than that of iron-chromium aluminum wire, it has higher strength at high temperatures. After long-term use, the material will not be brittle and the iron-chromium aluminum wire will be plasticity at high temperatures, with low strength.
After fully oxidized, the emissivity of nickel-chromium electric furnace heating wire is higher than that of the iron-chromium-aluminum electric furnace heating wire.
Nickel-chromium electric furnace wire is not magnetic, has good corrosion resistance, but is not resistant to sulfur atmosphere corrosion.