MANUFACTURE OF HIGH TENSILE STRENGTH RESISTANCE WELDED STEEL TUBE EXCELLENT IN TOUGHNESS IN WELD ZONE

PURPOSE:To manufacture a high tensile strength resistance welded steel tube excellent in toughness in the weld zone by subjecting the weld zone of a welded steel tube after the completion of welding to rolling under specified conditions, heating it and allowing it to cool. CONSTITUTION:A hoop 1 is c...

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Bibliographische Detailangaben
1. Verfasser:	OKAGUCHI HIDEJI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MACHINE TOOLS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PURPOSE:To manufacture a high tensile strength resistance welded steel tube excellent in toughness in the weld zone by subjecting the weld zone of a welded steel tube after the completion of welding to rolling under specified conditions, heating it and allowing it to cool. CONSTITUTION:A hoop 1 is continuously formed by a roll forming machine 2, and while its joint part is cramped by a squeeze roll stand 4, welding is continuously executed by a resistance welding machine 3. This weld zone (seamed zone) is rolled in the temp. range of >=400 deg.C at >=5% draft while bead grinding is executed by a combined bead grinding machine and seamed zone rolling mill 5. After that, it is heated to the temp. range of the Ac3 transformation point to [the Ac3 transformation point+200 deg.C] and is allowed to cool. In this way, the high tensile strength resistance welded steel tube having sufficient strength and low temp. toughness is stably produced on an industrial scale.