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AssigneeJfe Steel Corporation
InventorsAkihide MATSUMOTO, Atsushi MATSUMOTO, Shinsuke IDE, Takatoshi OKABE
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A metal pipe having an outer diameter of 150 mm to 3,000 mm and a wall thickness of 2 mm to 50 mm, and a method for manufacturing the same. The method includes a pipe-end-portion expansion step of expanding pipe end portions that are located at both ends of a mother pipe and an internal pressure application step that is performed after the pipe-end-portion expansion step and in which the mother pipe is expanded by applying an internal pressure, p, to the entire interior of the mother pipe until the internal pressure, p (MPa), that corresponds to changes in an axial compression amount s (mm), the axial compression amount, s, representing an amount of compression in a pipe axial direction against pipe extreme ends which are the both ends of the mother pipe, becomes a preset maximum internal pressure pmax (MPa), and p and s satisfy a specified formula.
A method for manufacturing a metal pipe, the method comprising:
A metal pipe having an outer diameter, DX, in a range of 150 mm or larger and 3,000 mm or smaller and a wall thickness, tX, in a range of 2 mm or larger and 50 mm or smaller,
Dependencies are inferred from the claim text.