High temperature radiant tube is continuous annealing furnace metallurgical industry, energy efficient "heart" part galvanizing line. The heating element or gas radiant tube enclosed in a shell, powered heating element, or combustion gases, and then by the radiant tube furnace casing and indirect radiative heat supply is processed parts, such as billets. Radiant tube is optional corrosion resistant, high temperature alloys, using centrifugal casting made, after machining, welding production into a W-shaped, U-shaped, two other forms of vertical tube furnace tube, and can produce with fin tubes. Then after ultrasonic testing, X-ray detection, pressure testing and other means to meet the design requirements. It has high thermal strength, airtight, anti-oxidation, anti-carburizing, thin wall, heating up fast and uniform, high radiation efficiency, energy saving, safe and reliable.