High strength electric steel tube and method of using high strength electric steel tube for earth stabilization work

摘要

The high strength electric steel tube of the present invention has a steel pipe outer diameter of 60.3 mm or more and 318.5 mm or less, and the ratio of the thickness of the steel pipe to the outer diameter of the steel pipe is 0.02 to 0.06 or less, and the tensile strength is more than 590 n / mm. Sup. 2, and when the central portion of the steel pipe is cut, the specific numerical range is given at a predetermined portion .