STRENGTHENED METAL PIPE AND PROCESS FOR MAKING SAME

Metal pipe or tubing having increased strength and toughness in a direction transverse to its axis, designed to prevent fractures and inhibit fracture propagation, for example in pipelines carrying fluids such as natural gas or oil. The pipes have localized sections spaced from their ends which have...

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Bibliographische Detailangaben
1. Verfasser:	MAKEPEACE, CHARLES E
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL BLASTING CHEMISTRY ENGINEERING ELEMENTS AND UNITS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PIPES PUNCHING METAL SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	Metal pipe or tubing having increased strength and toughness in a direction transverse to its axis, designed to prevent fractures and inhibit fracture propagation, for example in pipelines carrying fluids such as natural gas or oil. The pipes have localized sections spaced from their ends which have been toughened and strengthened by heat treating or some other known method of toughening and strengthening to a yield strength in excess of 60,000 p.s.i. The heat treating process requires subjecting the localized sections of the pipes to heat them, through their entire wall thickness, to the austenitizing temperature, after which the relevant sections are quenched using a liquid or gaseous quenching medium. The sections are then tempered to provide the desired degree of strength and toughness. These lengths of pip may be welded in a conventional manner.