Hot Rolled
Round Pipe Billet → Heating → Punching → Three-Roller Skew Rolling → Annealing →Acid Pickling→Coating Oil (Copper Plating) → Multi-pass Cold Drawing or ColdRolling → Pipe Billet → Heat Treatment → Straightening → Hydrostatic Test or Inspection → Marking → Warehousing
Cold Drawn
Round Pipe Billet → Heating → Punching → Pipe Head Treatment → Annealing →Acid Pickling →
Coating Oil (Copper Plating) → Multi-pass Cold Drawing or Cold Rolling → Pipe Billet → Heat Treatment → Straightening → Hydrostatic Test or Inspection → Marking → Warehousing