Round steel is a type of smooth-surfaced, ribless cylindrica...
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Special-shaped steel tubes refer to steel pipes with cross-sections that deviate from conventional shapes like circles or squares. They are typically produced through cold bending, welding, or hot extrusion processes, and come in a variety of cross-sectional forms such as oval, triangular, trapezoidal, D-shaped, and hexagonal tubes. These pipes combine structural functionality with aesthetic appeal—while meeting specific mechanical performance needs (e.g., directional bending resistance or anisotropic loading), they also serve design and assembly requirements in architecture and machinery. Special-shaped steel tubes are widely used in areas with unique shape demands, including architectural curtain walls (decorative elements), furniture manufacturing (frame structures), automotive industry (vehicle skeletons), and stage equipment (truss systems). They can serve both as load-bearing structural components and decorative features, embodying the modern engineering principle that "form follows function." As such, they represent both a functional extension and an aesthetic upgrade of traditional steel tubing.