How to choose metal sheath for tubular electric heater?
When copper or brass is used, due to its relatively low maximum operating temperature, it is usually only used for immersion heaters, and soft annealed copper tubes should not be used. For semi-hard copper pipes, it is difficult to obtain a sufficient insulation distance between the alloy resistance wire and the inner wall of the metal hall when filling with insulating powder, usually about 1mm.
For Cr18Ni8Ti and Cr25Ni20 heat-resistant pipes, they are mainly used as components of infrared radiators, grills and heating plates; in some places with high working temperature and corrosive conditions, such as tubular electric heating elements used in washing machines, this material is used It is ideal.
Among the commonly used pipes, Cr20Ni75 is a heat-resistant alloy pipe with good corrosion resistance.
No matter what kind of material the pipe is used, the inner surface should be thoroughly cleaned. Any material or residue is harmful to the insulating performance of the insulating material in the pipe. For tubular electric heating pipes used in different devices, the minimum thickness of the pipes needs to be considered when selecting the pipes. For example, the minimum thickness of the tubular element on the horizontal device is 0.40mm; and for the tubular electric heating tube used in particularly severe occasions, it is necessary to increase the thickness appropriately.
