Selection of resistance wire material of electric heating tube

Resistance wire is the core material of the electric heating tube. Today, I will talk about the selection of the resistance wire of the electric heating tube. The two most used electric heating wires in the production process of the electric heating tube are iron-chromium-aluminum and nickel-chromium alloy wires. The following is a major analysis of the advantages and disadvantages of the two for customers' reference!

 

The main advantages and disadvantages of iron-chromium-aluminum heating wire:

 

Advantages: Iron-chromium-aluminum heating wire has a high operating temperature, the highest operating temperature can reach 1400 degrees, (0Cr21A16Nb, 0Cr27A17Mo2, etc.), long service life, high surface load, good oxidation resistance, high resistivity, and low price.

 

Disadvantages: The main reason is that the high temperature strength is low, and its plasticity increases as the use temperature increases. The components are easy to deform, not easy to bend and repair, and are relatively brittle, so the iron, chromium, and aluminum are easy to break in a vibrating working environment.

 

The main advantages and disadvantages of nickel-chromium heating wire:

 

Advantages: high-temperature strength is higher than iron-chromium-aluminum, it is not easy to deform under high-temperature use, its structure is not easy to change, its plasticity is better, it is easy to repair, its emissivity is high, non-magnetic, strong corrosion resistance, long service life, etc.

 

Disadvantages: Because it is made of rarer nickel metal materials, the price of this series of products is up to several times higher than that of iron, chromium and aluminum, and the use temperature is lower than that of iron, chromium and aluminum.