Radiation heating tube inside the electric heating elements enclosed in a protective sleeve is electric heating and the heat radiation from casing indirect to furnace lining and processed workpiece, widely used in heat treatment industry of various kinds of heating furnace.Radiation heating pipe using electrothermal alloy material should have high resistivity, high electric conversion.Placed in the casing of the radiation tube, heat transfer process is different from general skeleton type electric heating element, its heat shield, heating elements must be in the process of temperature control, prevent components overtemperature.Radiant tube closed heating, electric heating element surface temperature higher than the furnace temperature about 100 ℃ to 150 ℃.So when select material to analyze furnace temperature and atmosphere in furnace temperature, choosing the right heating material.The radiant tube heating tube series have a squirrel cage, vertical belt type and screw, heating element is imported or domestic resistance wire, nichrome wire (or with), iron chromium aluminum wire (or zones), protecting tube adopts imported high temperature alloy plate, heat resistant steel plate welding or centrifugal casting and become, has the high temperature oxidation resistance and carburizing resistance performance is good, long service life, etc.