The electric heating wire of the heating element in the electric heating tube also has requirements, specific requirements are as follows:

The electric heating wire of the heating element in the electric heating tube also has requirements, specific requirements are as follows:

(1) Sufficient heat resistance, i.e. no oxidation or minimal oxidation at high temperatures;

(2) Has a certain mechanical strength at high temperatures;

(3) Larger than resistance, otherwise the tubular heating element has to be made very long, which is not easy to install;

(4) The smaller the temperature coefficient of resistance, the better;

(5) Good processing performance, can be processed into linear, strip or spiral shapes, and has good welding performance;

(6) Long term work without aging;

(7) The material source is based in China and the cost is low.

The commonly used materials in China are nickel based alloys and iron based alloys. Iron chromium aluminum alloy is more brittle than nickel chromium wire when heated, but because it is inside the tube and compacted in the filling material, the electric heating wire cannot withstand any colored mechanical pressure during heating. Therefore, the brittleness mentioned above does not exist for making tubular electric heating elements. In actual production, the specifications used for electric heating wires are between 0.15 and 1.6mm. When the wire diameter is ≥ 0.3mm, O0r25A5 iron chromium aluminum alloy wire is generally used. When the wire diameter p ≤ 0.25, Or20Ni80 nickel chromium alloy wire is used.

In the specific process of producing electric heating tubes, we always ask about the working environment, surface load, and working temperature of the electric heating tubes before designing them to choose the appropriate electric heating wire material. Currently, our company mainly uses steel wire from Beijing Shougang or high-end German BGH electric heating wire

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