STEEL PIPE AND STEEL PIPE STRUCTURE FORMED OF THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a steel pipe capable of optimizing a shape of the steel pipe, and excellent in buckling performance, and a steel pipe structure formed of the steel pipe.SOLUTION: A steel pipe 1 of the invention is produced by a machining method in which outer diameter is expanded or shortened. Outer diameter amplitude of a contour waveform formed by the expansion or shortening is 0.1% or less of outer diameter (D) of the steel pipe 1. The steel pipe 1 is a UOE steel pipe in which a waveform is generated in a production process.