Electric heating tube is also known as heating tube and heating tube. The scientific name is tubular electric heater element. The structure is that the spring heating wire is evenly distributed along the center of the tube. It is filled and compacted at the gap between the heating wire and the metal sheath tube. The thermal conductivity of the magnesium oxide powder, the nozzle is sealed with a sealing material, and the terminals at both ends of the tube are referred to the wiring. From the end wiring, the electric heating pipe has one end wiring and two ends wiring. The utility model has the advantages of simple structure, high mechanical strength, high thermal efficiency, safety and reliability, simple installation and long service life. Widely used in a variety of saltpeter tanks, water tanks, oil tanks, acid and alkali tanks, fusible metal melting furnaces, air heating furnaces, drying furnaces, drying ovens, hot stamping and other devices.