Which material is better for the outer tube of the electric heating tube?

It depends on what your electric heating tube is used for heating. Generally, the shell of the electric heating tube is 825, 800, 840, SUS310S, 316L, 304, 321, copper tube, aluminum tube, copper-plated iron tube, iron tube, titanium tube, etc. , 825,800 and copper pipes for boiling water are the best, but copper pipes are not resistant to dry burning and cannot be used for heating food and drinking water. For dry-burning internal type, SUS304 or 321 is generally used. If the use environment is bad or the use temperature is too high, it is recommended to use 800 or 310S. Aluminum tubes are generally used on heating plates such as electric kettles, mainly for fast heat conduction. The defect is that it is not resistant to high temperatures; copper and iron pipes or iron pipes are generally used for pouring, die-casting or inlaid cast aluminum heaters. What's more, it is necessary to have iron dragon or quartz tube in the sulfuric acid liquid to resist corrosion