DN80~DN1000 horizontal continuous anneal treatment furnace, in which it is divided into heating, keeping temperature, quick cooling，slow cooling and rear cooling technological sections, consists regularly of:

• Body of furnace

• Combustion system

• Pre-heated air assisting combustion system

• Fuel feeding system

• Pipe loading system

• Pipe unloading system

• Pipe conveying system inside furnace

• Exhausting system (including heat exchanger)

Definition of furnace length, which is mainly classified into 26m,36m and 46m,  depends on what productivity and rhythm user wants. Inside furnace, pipes pushed by paws mounted on chain will self-rotate under friction force between anti-heated rail and pipes, so circularity of pipes can be guaranteed when pipes are heated up to about 930℃. Thanks to smoke flow exhausted from chimney constructed under furnace, the heat efficiency of furnace is extremely high as quantity of heat is forced to commulate on pipes. The mechanical performance of cast iron pipes will be improved since ferrite will be the main base in microstructure of pipes. The quality of pipes after annealing with this furnace will conform with ISO2531:1998(E).

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