State of shipment: Delivery in a state of no heat treatment or heat treatment (annealing, normalizing or high temperature tempering). Delivery under heat treatment condition should be specified in the contract, and delivery without heat treatment should be specified in the contract.
Hot rolled (extruded seamless steel pipe): round billet heating piercing three roll cross rolling, continuous rolling or extrusion stripping sizing (or reducing) cooling billet tube straightening quality inspection wall thickness water pressure test (or flaw detection) marking storage.
Cold drawn (rolled) seamless steel pipe: round billet heating piercing beating annealing pickling oiling (copper plating) multi-pass cold drawn (cold rolling) billet tube heat treatment straightening quality inspection wall thickness water pressure test marking storage. Shandong Dongfei Metal Material Co., Ltd. mainly produces seamless pipe grades: 10 #, 20 #, 35 #, 45 #, 16Mn 20G