Cr-CONTAINING ELECTROSEAMED STEEL PIPE, AND MANUFACTURING METHOD THEREOF

To provide an electroseamed steel pipe excellent in corrosion resistance, and containing Cr over 3%.SOLUTION: In a Cr-containing electroseamed steel pipe containing Cr as much as 3.0-32.0 mass%, concerning Cr oxide defects existing on a welding surface, an evaluation length L, the maximum defective...

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1. Verfasser:	WATANABE FUMINORI
Format:	Patent
Sprache:	eng ; jpn
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 ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY FERROUS OR NON-FERROUS ALLOYS MACHINE TOOLS 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 PERFORMING OPERATIONS PUNCHING METAL SOLDERING OR UNSOLDERING TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WELDING WORKING BY LASER BEAM
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Zusammenfassung:	To provide an electroseamed steel pipe excellent in corrosion resistance, and containing Cr over 3%.SOLUTION: In a Cr-containing electroseamed steel pipe containing Cr as much as 3.0-32.0 mass%, concerning Cr oxide defects existing on a welding surface, an evaluation length L, the maximum defective length Lin L, and a ratio Lbetween the evaluation length Land a total defect length (total of line lengths of exposed defects) satisfy following formulas (1), (2), and thereby corrosion resistance of a weld zone becomes equivalent to that of a parent metal: L[mm]≤0.1...(1) (100×L/L)[%]