LOW-YIELD-RATIO HIGH-STRENGTH ELECTRICAL RESISTANCE WELDED TUBE AND METHOD OF MANUFACTURING THE SAME

PROBLEM TO BE SOLVED: To provide a method of manufacturing a low-yield-ratio high-strength electrical resistance welded tube with TS of 655 MPa or higher.SOLUTION: Steel raw material containing, by mass, C: 0.38-0.45%, Si: 0.15-0.25%, Mn: 1.0-1.8%, P: 0.03% or less, S: 0.03% or less, sol.Al: 0.01-0....

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Bibliographische Detailangaben
Hauptverfasser:	MATSUKI YASUHIRO, INOUE TOSHIHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MACHINE TOOLS 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 METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL ROLLING OF METAL SOLDERING OR UNSOLDERING TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method of manufacturing a low-yield-ratio high-strength electrical resistance welded tube with TS of 655 MPa or higher.SOLUTION: Steel raw material containing, by mass, C: 0.38-0.45%, Si: 0.15-0.25%, Mn: 1.0-1.8%, P: 0.03% or less, S: 0.03% or less, sol.Al: 0.01-0.07%, and N: 0.005% or less is made into a hot-rolled steel strip by performing a finishing rolling at a finishing-rolling start temperature of 950°C or lower and a finishing-rolling end temperature in a range of 820-920°C, and the hot-rolled steel strip is coiled up at a coiling temperature in a range of 650-800°C after the finishing rolling. The coiled hot-rolled steel strip is made into the electrical resistance welded tube by performing a tubulation process including supplying, molding, and electrical resistance welding at a room temperature without heating, thereby obtaining such an electrical resistance welded tube that exhibits a material variation in a longitudinal direction of the tube even lower than TS:20 MPa, and has a low yield ratio of yield ratio: 80% or lower, and high strength of yield strength YS: 379-552 MPa and tensile strength TS: 655 MPa or higher.