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Linear Seam Welded Steel Pipe
Manufacturers and contractors seeking robust, dimensionally accurate, and readily available steel piping solutions consistently turn to Linear Seam Welded Steel Pipe. This category, also frequently referred to as Straight Seam Welded Steel Tube or ERW Longitudinal Welded Pipe, defines a high-efficiency manufacturing process where the longitudinal seam is formed and welded in a straight line parallel to the pipe's axis. The production method is highly automated, ensuring consistent wall thickness and excellent roundness, which is critical for structural integrity and fluid flow. These pipes are a cornerstone for structural frameworks, mechanical systems, and low to medium-pressure fluid transport. The inherent strength and straightness of a Straight Welded Seam Steel Pipe make it the preferred choice for architectural columns, conveyor rollers, and fencing systems. For applications demanding a balance of performance and cost-effectiveness, a Longitudinal Seam Welded Tube offers an optimal solution, providing reliable performance without the premium cost of seamless alternatives.
The manufacturing excellence of a Linear Seam Welded Steel Pipe begins with high-quality steel coils, which are unrolled, leveled, and formed through a series of rolls. The edges are prepared and brought together under controlled pressure and heat to create a uniform longitudinal weld. This process is precisely calibrated to produce pipes with exceptional dimensional tolerances. Key parameters that define the suitability of these pipes for specific projects include material grade, dimensions, wall thickness, and mechanical properties. The following specifications provide a detailed overview of the standard and custom offerings available.
- Material Standards: Manufactured from carbon steel grades per ASTM A53, ASTM A500, ASTM A501, and ASTM A36. Also available in low-alloy and high-strength low-alloy (HSLA) steels.
- Welding Process: Utilizes high-frequency induction welding (HFIW) or electric resistance welding (ERW), ensuring a clean, strong, and consistent seam.
- Surface Finish: Standard mill finish (unpainted), black, galvanized (hot-dip or electro-galvanized), or with various primer coatings.
- End Finish: Plain ends, beveled ends for welding, or threaded ends as per customer requirements.
- Testing & Certification: All pipes undergo rigorous non-destructive testing (NDT), including ultrasonic or eddy current testing. Full material traceability and mill test certificates (MTC) are provided.
| Outer Diameter (OD) | Wall Thickness (WT) | Common Lengths | Primary Applications |
|---|---|---|---|
| 1/2" to 24" (13mm to 610mm) | Schedule 10 to Schedule 80 | 20 ft, 24 ft, 40 ft (6m to 12m) | Structural Framing, Handrails, Fencing |
| 26" to 48" (660mm to 1220mm) | 0.25" to 1.0" (6mm to 25mm) | Custom lengths up to 50 ft (15m+) | Piling, Large-Diameter Conduits, Casing |
| Square & Rectangular Profiles | 0.083" to 0.50" (2mm to 13mm) | 20 ft, 24 ft (6m to 7.3m) | Architectural Columns, Machine Bases, Supports |
| Grade / Specification | Yield Strength (min) | Tensile Strength (min) | Elongation (%) |
|---|---|---|---|
| ASTM A53 Grade B | 35,000 psi (240 MPa) | 60,000 psi (415 MPa) | – |
| ASTM A500 Grade B | 42,000 psi (290 MPa) | 58,000 psi (400 MPa) | 23 |
| ASTM A500 Grade C | 46,000 psi (317 MPa) | 62,000 psi (427 MPa) | 21 |
| ASTM A36 | 36,000 psi (250 MPa) | 58,000 - 80,000 psi (400-550 MPa) | 23 |
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