Hot rolling (extrusion of seamless steel tubes): round tube blank → heating → piercing → three roll cross rolling, continuous rolling or extrusion → pipe stripping → sizing (or reducing) → cooling → blank tube → straightening → hydrostatic test (or flaw detection) → marking → warehousing.

Cold drawn (rolled) seamless steel pipe: round pipe blank → heating → piercing → heading → annealing → pickling → oiling (copper plating) → multi pass cold drawn (cold rolled) → blank pipe → heat treatment → straightening → hydrostatic test (flaw detection) → marking → warehousing.