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Special Profile Carbon Steel Pipe

For complex structural and mechanical applications where standard round pipe falls short, our Special Profile Carbon Steel Pipes provide the engineered solution. Unlike conventional tubes, these pipes are manufactured into specific, non-circular cross-sectional profiles to meet unique design, strength, and spatial requirements. They are essential in industries demanding high load-bearing capacity, efficient material use, and precise fit within confined or specially designed spaces. We offer a comprehensive range of profiles, including square, rectangular, oval, hexagonal, and custom geometries. Whether you need Special Shaped Carbon Steel Tube for architectural frameworks, Custom Shaped Carbon Steel Tube for specialized machinery, Irregular Carbon Steel Welded Tube for support structures, or high-performance Special Shaped Welded Steel Pipe, our products are fabricated to exacting standards from high-grade carbon steel, ensuring superior durability, weldability, and formability.


The Special Profile Carbon Steel Pipe distinguishes itself through precise dimensional control and robust mechanical properties. Manufactured through advanced forming and welding processes, this pipe maintains excellent consistency in wall thickness and profile accuracy across long production runs. Key parameters that define its performance include:

  • Material Grades: Common grades include ASTM A500, A501, A53, A36, and ST37/ST52, with options for Q195, Q215, Q235, and Q345 to meet various strength and application needs.
  • Key Manufacturing Standards:
    • ASTM A500 (Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes)
    • ASTM A513 (Standard Specification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing)
    • EN 10219 (Cold formed welded structural hollow sections of non-alloy and fine grain steels)
    • JIS G3466 (Carbon steel square and rectangular tubes for general structure)
  • Primary Production Processes: High-frequency electric resistance welding (ERW), seamless hot extrusion (for specific profiles), and cold drawing/forming.
  • Surface Treatment: Available as black (mill finish), galvanized (hot-dip or electro-galvanized), painted, powder-coated, or with other anti-corrosion coatings.

The following table details typical specifications and technical data for our standard profile offerings:

Profile Shape Common Size Range (mm) Wall Thickness (mm) Typical Yield Strength (Min MPa) Typical Tensile Strength (MPa) Common Applications
Square 20x20 to 500x500 1.0 - 20.0 235 - 345 370 - 490 Building columns, frames, fencing, machinery bases
Rectangular 50x25 to 600x400 1.2 - 25.0 235 - 355 370 - 510 Support beams, conveyor frames, vehicle chassis, architectural sunshades
Oval / Flat Oval Major axis: 30 - 300 1.0 - 8.0 235 - 275 370 - 450 Handrails, furniture, decorative structures, aerodynamic components
Hexagonal Across flats: 15 - 150 1.5 - 12.0 235 - 345 370 - 490 Tool handles, fasteners, specialized mechanical parts
Custom Shapes Per customer drawing As specified As per grade As per grade Prototypes, specialized industrial equipment, unique architectural elements

Technical performance is further enhanced by tight tolerances on cross-sectional dimensions, straightness, and corner radii. The Special Profile Carbon Steel Pipe can be supplied in random lengths, fixed single lengths, or precision-cut-to-length, ready for fabrication. Its weldability allows for easy integration into larger assemblies using common arc welding methods. For demanding environments, options include enhanced corrosion resistance through specific steel chemistries or protective coatings, ensuring long-term structural integrity in both indoor and outdoor settings.

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