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Structure Steel Pipes Hot-Rolled Seamless Steel Tube Hot-rolled seamless steel tubes for structural purposes are classified into two types as per "Seamless Steel Tube for Structure" (GB/T 8162-2008): hot rolling (extrusion, expansion) and cold drawing (rolling). Hot-Rolled Steel Pipe: Outer Diameter: 32-630mm Wall Thickness: 2.5-75mm Hot-rolled steel pipes are produced through extrusion or expansion methods, providing robustness suitable for structural applications. Cold-Drawn Steel Pipe: Outer Diameter: 5-200mm Wall Thickness: 2.5-12mm Cold-drawn steel pipes undergo a rolling process, offering precision dimensions and smoother surface finishes ideal for structural components. Welded Steel Tube Welded steel tubes for structural purposes are fabricated from steel plates or strips, distinguished into straight welded steel pipes and spiral welded steel pipes. Straight Welded Steel Pipe: Outer Diameter: 5-508mm Wall Thickness: 0.5-12.7mm Conforms to GB/T 3091-2008 standards, these pipes are formed by crimping and welding steel plates, suitable for various structural applications. Spiral Welded Steel Pipe: Produced by twisting steel strips into a spiral shape and welding the edges together, offering strength and versatility for structural uses. Common Applications Low-Pressure Fluid Transportation: Commonly referred to as "clarke pipe" and specified in nominal diameter (mm), complying with GB/T 3091-2008 for low-pressure fluid transportation. Summary Structure steel pipes are essential in construction and industrial applications, providing durability and strength. Hot-rolled seamless pipes offer robustness, while cold-drawn tubes ensure precision and smooth finishes. Welded pipes, whether straight or spiral, cater to diverse structural needs, from general construction to fluid transportation.
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