The stainless steel electric heating tube is formed by placing an electric heating element in a metal tube and closely filling the void portion with crystalline magnesium oxide powder having good heat resistance, thermal conductivity and insulation, and is processed by other processes. 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. The hot-type electric water heater manufacturers use more stainless steel heating tubes, and the price difference between various tubes is large. The same is the stainless steel electric heating tube, the difference in quality and performance is also very large. The difference between the quality of the stainless steel electric heating tube is mainly due to the different nickel content. Nickel is an excellent corrosion resistance material. When it is combined with chromium in stainless steel, the corrosion resistance and process performance of the stainless steel are improved. However, for low-carbon nickel steels to achieve pure austenitic structure, the nickel content should reach 24%, and the corrosion resistance of steel in some media is significantly changed as long as it contains 27% nickel. Therefore, from the material point of view 800, 840, 316 is a better corrosion-resistant and high-temperature resistant stainless steel electric heating tube, 800 stainless steel tube nickel content reaches 30%, 840 tube nickel content reaches 20%, if used The worse 304 tube stainless steel contains only 8% nickel. Therefore, the 316 stainless steel bright rod is also very advantageous in the use of high-temperature resistant high temperature corrosion resistant stainless steel heating tubes.