1.
Seamless tube billet heating: the purpose is to improve the plasticity of the steel tube and reduce the deformation resistance of the steel; to provide a good metallographic structure for the rolled tube. The heating furnaces used mainly include: annular heating furnace, walking heating furnace, inclined bottom heating furnace and car bottom heating furnace, etc.
2. Heating of waste pipes: the purpose is to increase and uniform the temperature of waste pipes, improve the plasticity of steel, control its metallographic structure, create favorable conditions for the sizing of waste pipes, and ensure the mechanical properties of steel pipes. The heating furnaces used mainly include: Feed type heating furnace, continuous roller hearth type heating furnace, inclined bottom type heating furnace, electric induction type heating furnace.
3. Steel pipe annealing heat treatment during cold rolling (drawing): The purpose is to eliminate the work hardening phenomenon of seamless steel tubes during cold working, reduce the deformation resistance of steel, and create conditions for continued cold working of steel pipes.
The heating furnaces used are mainly: walking heating furnace, car bottom heating furnace, continuous roller bottom heating furnace.
4. Steel pipe performance heat treatment: the main purpose is to control the metallographic structure of the steel pipe and improve the comprehensive performance of the steel pipe. The heating furnaces used mainly include: walking heating furnace, continuous roller hearth heating furnace, car bottom heating furnace, protective gas heating furnace.
5. Features: In the production of seamless tubes, annular heating furnaces and walking heating furnaces are the most widely used; electric induction heating furnaces are also being developed; and inclined bottom heating furnaces tend to tend to be due to low heating quality and high labor intensity. disuse.
① Continuous roller hearth heating furnace: mainly used for heat treatment of
cold-rolled (drawn) steel pipes.
②Car Bottom Heating Furnace: It is more suitable for alloy thick-walled steel pipes with small batches and long heating and holding times.
③ Protective gas continuous roller hearth heating furnace: mainly used for the heat treatment of finished steel pipes that require no oxidation on the surface of seamless steel pipes and the annealing treatment without pickling process in the process of cold rolling (drawing).
