According to the classification of high temperature electric furnace wire, there are mainly fe-Cr alloy electric furnace wire and Ni-Cr alloy electric furnace wire. The former belongs to the ferrite structure alloy material, the latter belongs to the austenite structure alloy material. In addition, there are a number of special purpose electric heating alloy wire, such as tungsten wire, molybdenum wire and other high temperature electric furnace according to different USES, to achieve different temperatures, choose different electric furnace wire.
I. Characteristics of fe-CR-Al electric furnace wire electrothermal alloy materials:
1, the use temperature is high, such as HRE ferrochrome aluminum alloy wire in the atmosphere can be up to 1400℃, that is, the temperature of the high temperature electric furnace can reach 1400 degrees, if the temperature of the high temperature electric furnace exceeds 1400 degrees, this kind of electric furnace wire can not meet the demand, need to choose other materials to replace.
2. High surface load;
3. Long service life;
4. Good sulfur resistance;
5. Lower price compared with nickel-chromium alloy;
6. Good oxidation resistance. AI2O3 film formed after oxidation has good oxidation resistance and high resistivity, with a specific gravity less than ni-Cr alloy and high resistivity;
7, the disadvantage is that with the increase of temperature, the performance of plastic, low strength at high temperature.
II. Features of ni-Cr wire for high temperature electric furnace:
1. Better high temperature resistance, high strength at high temperature;
2. The emissivity of fully oxidized Ni-Ming alloy is higher than that of ferrochrome aluminum alloy;
3. Non-magnetic;
4, in addition to sulfur atmosphere, good corrosion resistance.
5, after long-term use and then cold, the material will not become brittle;
We need to know that no matter what kind of material to choose electric furnace wire, it is not a layer of constant, is not fixed, or mainly by the working temperature of high temperature electric furnace decided, according to the different characteristics of electric furnace wire to choose.