不锈钢电热管（电热管）是以金属管为外壳，沿管内中心轴向均布螺旋电热合金丝（镍铬、铁铬合金）其空隙填充压实具有良好绝缘导热性能的氧化镁砂，管口两端用硅胶或陶瓷密封，这种金属铠装电热元件可以加热空气，金属模具和各种液体。
Stainless steel electric heating pipe (electric heating pipe) is a kind of magnesia with good insulation and thermal conductivity, which is filled and compacted by spiral electric heating gold wire (Ni Cr, Fe Cr alloy) uniformly distributed along the central axis of the pipe. Both ends of the pipe mouth are sealed with silica gel or ceramic. This kind of metal armored electric heating element can heat air, metal mold and various liquids.