Process of seamless steel pipe

Process of seamless steel pipe
According to different manufacturing(mfg), seamless steel pipe can be divided into hot rolled pipe, cold rolled pipe, cold drawn pipe and extruded pipe.

Hot Rolled Process for Seamless Steel Pipe

Round Pipe Billet → Heating → Punching → Three-Roller Skew Rolling, Continuous Rolling or Extruding → Pipe Detaching →
Micro Tension Sizing or Reducing → Cooling → Straightening → Hydrostatic Test or Inspection → Marking → Warehousing

Cold Drawn Process for Seamless Steel Pipe

Round Pipe Billet → Heating → Punching → Pipe Head Treatment → Annealing → Acid Pickling → Coating Oil → Multi-pass Cold Drawing
→ Pipe Billet→ Heat Treatment → Straightening →Hydrostatic Test or Inspection → Marking → Warehousing

Production equipments of all process

Starting material Steel billets of various dimensions and grades, continuously cast or rolled Billet preparation Billet saws Furnace technology Billet centering	Piercing From the billet to the hollow Cross-rolling mills (cone type and barrel type piercing) Billet descaling 3-roll piercing mills Hollow inside deoxidation Cooling and quick-change systems for piercing tools	Elongating expanding From the hollow to the shell PQF® / MPM mill CPE/TPE mill / Push bench technology Assel mills, Plug mills, Hot pilger mills Elongators Rotary Expanders
Finish rolling From the shell to the tube Reheating furnace (gas fired/induction) High pressure water descaling unit Sizing mill, Stretch-reducing mill FPS adjustable rolling stands Tube layer saws	Finishing line From the rolling mill to the dispatch area Groove dressing machines for PQF® cartridges Stretch-reducing and sizing mill stands	Products Seamless tubes of various dimensions Diameters: 21.3 mm to 914.4 mm Wall thicknesses: 2.11 mm to 60 mm