What material is the magnetic attraction of the wires in the porcelain tube made of?

Different electric heating tubes have different uses, and the wires inside are nickel, which is a useful resistance wire. What line to use depends on many factors! In electric heating tubes, tungsten resistance wires are generally used. Electric heating wire is a common heating element, which can convert electric energy into heat energy after being electrified. Widely used in metallurgical machinery, medical, chemical, ceramics, electronics, electrical appliances, glass and other industrial heating equipment and civil heating appliances.