SQUARE STEEL TUBE IMPROVED IN RESISTENCE FOR BUCKLING USING ROLLED STEEL WITH RIB-SHAPE, AND METHOD OF MANUFACTURING THE TUBE

摘要

PURPOSE: A square steel pipe and a manufacturing method thereof using rolled shape steel including a rib shape for reinforcing resistance against buckling are provided to simplify a manufacturing process of a square steel pipe by making an integrated unit through rolling without bending or curving a material. CONSTITUTION: A square steel pipe comprises a reinforcing structure formed through rolling in order to reinforce buckling performance by a longitudinal direction compressive force. The square steel pipe includes a steel pipe body(10) having a square vertical section in a longitudinal direction and a rib(20) formed lengthwise on the inner side of the steel pipe body.