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Manufacturing process of seamless steel pipe

1. Manufacturing process of hot rolled (extrusion seamless steel pipe): 


round billet → heating → piercing → three roll cross rolling, continuous rolling or extrusion → tube removal → sizing (or reducing) → cooling → straightening → hydrostatic test (or flaw detection) → marking → putting into warehouse 


2. Manufacturing process of cold drawn (rolled) seamless steel pipe: 

round billet → heating → piercing → heading → annealing → pickling → oiling → times cold drawn (cold rolled) → billet tube → heat treatment → straightening → hydrostatic test (flaw detection) → marking → putting into warehouse




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