A PROCESS OF PRODUCING A DUPLEX STAINLESS STEEL TUBE

The present disclosure relates to a process of producing a duplex stainless steel tube, said process comprising the steps of a) producing an ingot or a continuous casted billet of said duplex stainless steel; b) hot extruding the ingot or the billet obtained from step a) into a tube; and c) cold rol...

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Bibliographische Detailangaben
Hauptverfasser:	SVEDBERG DANIEL, KONBERG ERIK
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALLOYS AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL ROLLING OF METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The present disclosure relates to a process of producing a duplex stainless steel tube, said process comprising the steps of a) producing an ingot or a continuous casted billet of said duplex stainless steel; b) hot extruding the ingot or the billet obtained from step a) into a tube; and c) cold rolling the tube obtained from step b) to a final dimension thereof; wherein the outer diameter D and the wall thickness t of the cold rolled tube is 50-250 mm respectively is 5-25 mm, wherein, for the cold rolling step, R and Q are set such that the following formula is satisfied: Rp0.2target = 416.53+ 113.26 * logQ + 4.0479 * R + 2694.9 * C% - 82.750 * (logQ) 2 - 0.04279 * R 2 - 2.2601 * logQ * R + 16.9 * Cr% + 26.1 * Mo% + 83.6 * N% +/- Z (1) wherein Rp0.2target is targeted yield strength and is 800-1100 MPa; Q = (W0 - W1) * (OD0-W0)/W0((OD0-W0)-(OD1-W1)) (2) wherein W1 is tube wall thickness before cold rolling, W0 is tube wall thickness after cold rolling, OD1 is outer diameter of tube before cold rolling, and OD