The production process flow of seamless pipes

Preparation and inspection of pipe blanks. Firstly, it is necessary to prepare suitable round tube blanks and conduct necessary inspections to ensure that there are no defects. 
Heating of pipe blank. The billet needs to be heated to an appropriate temperature in the heating furnace before entering the next step.
Perforation. The heated tube blank is perforated through a piercing machine, which forms a capillary.
Rolling. The perforated tube blank will enter the rolling mill for further processing, including rolling and leveling, to reduce the outer diameter and wall thickness, forming specific dimensions and shapes.
Fixed diameter. The rolled pipe blank will undergo sizing treatment to ensure the uniformity of the inner and outer diameters.
Heat treatment. Hot rolled seamless pipes may undergo heat treatment to improve their mechanical properties. 
Straighten. After heat treatment, the pipes will be straightened to ensure their straightness and dimensional accuracy.
Precision and inspection. The straightened pipe will undergo finishing treatment, including removing surface defects and conducting necessary inspections to ensure that it meets quality standards.
Oil coating and packaging. Finally, the pipes may be coated with oil to prevent rust and undergo final packaging and labeling.