... :ISO9001:2000 Package:export packing,or as requirment W-type Radiant Tube1.Material:Alloy2.Process:centrifugal casting process3.Quality ... ammonia,methanol),cracking furance (ethylene,styrene,naphtha),pyrolysis and fired heaters etc.2. Steel and Heat-treatment :radiant tubes,furnace ... used as gas burner heater,there're W type ,U type, Single-ended type.It is made by centrifugal casting process, ...