Stainless steel electric heating rod (electric heating tube) is a metal tube as the shell, and spiral electric heating alloy wires (nickel-chromium, iron-chromium alloy) are uniformly distributed along the central axis of the tube. The gaps are filled and compacted with magnesium oxide powder with good insulation and thermal conductivity. Both ends are sealed with silica gel or ceramics. This metal armored electric heating element can be widely used for heating water, oil, air, nitrate solution, acid solution, alkali solution and low melting point metals (aluminum, zinc, tin, babbitt alloy) , It has the advantages of good heating efficiency, uniform temperature, high temperature resistance, corrosion resistance, and good safety performance.