JOINED BODY OF METALLIC PIPES FOR EXPANDED PIPE AND METHOD OF MANUFACTURING THE SAME

PROBLEM TO BE SOLVED: To provide a joined body of metallic pipes for an expanded pipe which has high corrosion resistance and is expandable at a high expansion ratio, and a method of manufacturing the joined body. SOLUTION: Two metallic pipes are butted at their end surface, diffusion- joined, and t...

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Bibliographische Detailangaben
Hauptverfasser:	HORIO KOJI, KITO KAZUNARI, INAGAKI SHIGEYUKI, HIYAMIZU TAKAO, YAMADA RYUZO
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING 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 MACHINE TOOLS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PIPES SOLDERING OR UNSOLDERING SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL TRANSPORTING WEAPONS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a joined body of metallic pipes for an expanded pipe which has high corrosion resistance and is expandable at a high expansion ratio, and a method of manufacturing the joined body. SOLUTION: Two metallic pipes are butted at their end surface, diffusion- joined, and then cooled (joining process). The vicinity of the joined part is kept at a temperature not lower than (At transformation temperature -100 deg.C) and lower than At transformation temperature for at least 30 seconds so that the ratio of the maximum hardness of the vicinity of the joined part to the hardness of the metallic pipes before joined becomes 1.4 or smaller, and then cooled (tempering process). In a case where the tempering is performed with a heating means having a narrow band of a uniform temperature, it is preferable that the vicinity of the joined part is kept at a temperature not lower than the A1 transformation temperature and not higher than (A1 transformation temperature +100 deg.C) for at least 30 seconds before the tempering is performed, and then cooled (intermediate heat treatment process).