Round steel pipe is a type of pipe with a hollow circular cross-section. According to the manufacturing process, it can be classified into seamless steel pipes (produced by hot rolling or cold drawing through perforation) and welded steel pipes (formed by rolling and welding steel plates). Its specifications are expressed as outer diameter × wall thickness (e.g., Φ50×3mm). It features isotropic stress distribution, outstanding torsional resistance, and high cross-sectional efficiency. Round steel pipes are widely used in building structures (such as space trusses and truss joints), mechanical manufacturing (hydraulic cylinders, drive shafts), fluid transportation (oil pipelines, water supply and drainage systems), and municipal engineering (guardrail supports, light poles). They can serve as individual load-bearing components or be assembled into complex spatial structures via intersecting welds. Combining structural efficiency with economic advantages, round steel pipe is one of the most commonly used pipe types in modern engineering.
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