W-type Radiant Tube Standards:ASME,DIN,GB Material:Alloy Quality: ... naphtha),pyrolysis and fired heaters etc.2. Steel and Heat-treatment :radiant tubes,furnace rolls and castings of re ... -heating furnaces,steei mills and heat-treatment industries. Radiant tube is used as gas burner heater,there' ... is made by centrifugal casting process,characteristic of heat resistance and excellent creep srtength.