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ERW Straight Seam Steel Tube

When sourcing reliable and efficient tubular products for pressure applications, structural frameworks, or fluid conveyance systems, Straight Seam Welded Steel Tube stands as a fundamental component. Manufactured using the Electric Resistance Welding (ERW) process, this category of pipe is known for its consistent quality and dimensional accuracy. The ERW Longitudinal Welded Pipe is produced by forming hot-rolled steel coil and then welding the seam through the application of high-frequency electrical current, creating a robust bond without the use of filler metal. This method ensures a clean, high-strength weld that is often as strong as the base metal itself. A Straight Welded Seam Steel Pipe is particularly valued in applications requiring a smooth internal surface and excellent concentricity, which optimizes flow efficiency and simplifies installation. From construction and fencing to mechanical tubing and low-pressure pipelines, the versatility of Longitudinal Seam Welded Tube makes it a preferred choice for engineers and fabricators seeking a cost-effective yet high-performance solution.


The manufacturing excellence behind our ERW Straight Seam Steel Tube is reflected in its precise specifications and reliable performance metrics. We adhere to stringent international standards, including ASTM, EN, and JIS, to ensure every pipe meets the required chemical, mechanical, and dimensional tolerances. The product is available in a wide range of sizes, wall thicknesses, and steel grades to suit diverse project requirements.

Key Product Parameters:

  • Production Standard: ASTM A53, ASTM A500, ASTM A513, EN 10219, JIS G3444
  • Steel Grade: Common grades include AISI 1006, 1008, 1010, 1012, 1015, 1018, 1020, 1025. Also available in higher-strength low-alloy (HSLA) grades.
  • Welding Process: High-Frequency Electric Resistance Welding (HF-ERW)
  • Surface Finish: Black (as-welded), Galvanized (hot-dip or electro), Pre-painted
  • Ends: Plain end, Beveled end, Threaded and coupled
  • Testing & Inspection: Each batch undergoes hydrostatic testing, flattening tests, flaring tests, and non-destructive electric testing (EDDY current) to guarantee weld integrity and overall quality.
Outer Diameter (OD) Wall Thickness (WT) Length Tolerance (OD/WT) Common Applications
1/2 inch (21.3 mm) to 24 inches (610 mm) SCH 10, SCH 40, SCH 80, and customized gauges from 0.8mm to 12.7mm Fixed: 6m, 12m; Random: 5.8m - 12.2m ±0.5% on OD, ±10% on WT (Standard), tighter tolerances available Water & Gas Pipelines, Structural Columns, Mechanical Parts, Scaffolding, Fencing
Round, Square, and Rectangular shapes available Varies by shape and size As above; also custom cut lengths Per relevant ASTM/EN standards for structural tubing Architectural Structures, Roll Cages, Furniture, Handrails, Agricultural Equipment

The inherent strength of ERW Straight Seam Steel Tube comes from its uniform grain structure and the continuity of the weld seam. The controlled forming and welding process minimizes residual stress and results in excellent ovality and straightness. For galvanized options, the pipe undergoes thorough cleaning and is coated via the hot-dip process, providing superior corrosion resistance for outdoor and harsh environments. Its dimensional consistency ensures ease of fabrication, whether it involves cutting, bending, or welding, reducing material waste and labor time on-site. This combination of precise engineering, material integrity, and application adaptability defines the core value proposition of our product line.

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