What are the things that must be checked when the electric heating tube leaves the factory?

The core heating element of the electric heating tube is the heating wire. The heating wire that can be called the heating element in the electric heating tube also has requirements, and the specific requirements are as follows: (1) Sufficient heat resistance, that is, no oxidation or very little oxidation at high temperature; (2) A certain mechanical strength at high temperature; (3) Large specific resistance, otherwise the tubular electric heating element has to be made very long, which is inconvenient to install; (4) The smaller the temperature coefficient of resistance, the better; (5) Good processing performance, can be processed into wire, strip or spiral shape, and has good welding performance; (6) No aging after long-term work; Currently, 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 in the tube and is compacted in the filler, the heating wire is not subjected to any mechanical pressure when heated. Therefore, the brittleness disadvantage mentioned above does not exist for the manufacture of tubular electric heating elements. In actual production, heating wire specifications range from 0.15 to 1.6 mm. When the wire diameter is ≥ 0.3 mm, O0r25A5 iron-chromium-aluminum alloy wire is generally used. When the wire diameter is ≤ 0.25 mm, Or20Ni80 nickel-chromium alloy wire is used.

In the production of electric heating tubes, we always carefully consider the operating environment, surface load, and operating temperature parameters before designing the heating tubes to select the appropriate heating wire material. Currently, our company primarily uses steel wire from Beijing Shougang or high-end German BGH heating wire.