Common advantages and disadvantages of using electric furnace wires in box type resistance furnaces

Common advantages and disadvantages of using electric furnace wires in box type resistance furnaces

There are many types of new energy kilns and their uses vary. Therefore, in selecting electric furnace wires, different resistance furnaces are required to match suitable electric furnace wires due to different differences. According to material classification, commonly used electric furnace wires include iron chromium aluminum alloy electric furnace wire material and nickel chromium alloy electric furnace wire material. The former belongs to alloy materials with ferrite structure, while the latter belongs to alloy materials with austenite structure. In addition, there are also some special purpose electric heating alloy wires such as tungsten wires, molybdenum wires, and other box type resistance furnaces that choose different electric furnace wires according to different purposes and temperatures reached.

1、 Characteristics of iron chromium aluminum electric furnace wire electric heating alloy material for box type resistance furnace:

1. The use temperature is high, such as the maximum use temperature of HRE iron chromium aluminum alloy wire in the atmosphere can reach 1400 ℃, which means that the maximum temperature of a box type resistance furnace can reach 1400 ℃. If a box type resistance furnace needs to be designed beyond this temperature, other electric furnace wires need to be selected;

2. Long service life;

3. The allowable surface load is high;

4. Good antioxidant performance, the AI2O3 film generated after oxidation has good chemical resistance and high resistivity, with a specific gravity smaller than that of nickel chromium alloy and high resistivity;

5. Good sulfur resistance;

6. The price is significantly lower than nickel chromium alloy;

7. The disadvantage is that as the temperature increases, it exhibits plasticity and low strength at high temperatures.

2、 Characteristics of nickel chromium electric furnace wire for box type resistance furnace:

1. High strength at high temperatures;

2. After long-term use and further cooling, the material will not become brittle;

3. The radiation rate of fully oxidized nickel alloy is higher than that of iron chromium aluminum alloy;

4. Non magnetic;

5. Besides sulfur atmosphere, it has good corrosion resistance.

3、 Disadvantages of alloy furnace wires for box type electric furnaces:

Alloy electric furnace wire is the most widely used and widely used heating material. Its disadvantage is that it is in a very high temperature (hot state) during operation, and is prone to oxidation reaction and burning in the air; From the perspective of electric heating energy conversion, energy loss is caused by the generation of some visible light; Electric furnace wires are often used in a spiral state, which can produce an inductive reactance effect when energized.

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