| 摘要 |
This steel pipe having a flange disk welded thereto comprises: a flange disk having a plate-shaped annular flange section, and a connecting section positioned on the outer circumferential side of the flange section and having an annular portion, at least a part of which protrudes on the side of one surface of the flange section; and a steel pipe welded to the side of one surface of the connecting section and having a pipe wall thickness of t. A weld metal section formed by welding is provided between the connecting section and the steel pipe, and, in the cross-section of the weld metal section containing the pipe axis of the steel pipe, a cross-sectional area SO on the outer circumferential side relative to the center in the pipe wall thickness direction of the steel pipe and a cross-sectional area SI on the inner circumferential side satisfy the relationship SO=1.5SI, and the distance between a weld toe, which is on the inner surface side and on the flange section side of the weld metal section, and a flange corner portion, which is a portion at which the inner surface of the connecting section and the one surface of the flange section intersect, is equal to or greater than 5mm and equal to or less than the pipe wall thickness t. |
