How to use resistance wire

How to select resistance wire

Today I would like to tell you about the core heating element of the electric heating tube - the electric heating wire.

The electric heating wire, which can be called the heating element in the electric heating tube, is also required. The specific requirements are as follows:

(1) Sufficient heat resistance, that is, no oxidation or little oxidation at high temperature;

(2) It has a certain mechanical strength at high temperature;

(3) Higher than the resistance, otherwise the tubular heating element would have to be made very long, which would be inconvenient for installation;

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

(5) Good machining performance, can be processed into line, ribbon or spiral, and has good welding performance;

(6) Long working hours without aging;

(7) The source of materials is based on the domestic, and the cost is low.

At present, the most commonly used materials in China are nickel base alloy and iron base alloy.

Fe-cr alloy is more brittle than ni-Cr wire when heated, but because it is in the tube, and is pressed into the filling material, the heating wire is not subjected to any color mechanical pressure when heated, so the brittleness defect mentioned above does not exist for making tubular heating elements.

In actual production, the specifications of the electric heating wire are between 0.15 and 1.6mm. O0r25A5 fe-Cr alloy wire is generally used when the wire diameter is ≥0.3mm, and Or20Ni80 ni-Cr alloy wire is used when the wire diameter P is ≤0.25.

Concrete in the process of production of electric heating tube, we are all will ask before the design of heating tube electric heating tube of the working environment, the electric heating tube surface load and the working temperature to select the suitable parameters, such as heating wire material, at present our company mainly USES is Beijing shougang spray of molten steel wire or high-end German unfairly heating wire, etc.