Straight Seam Welded Steel Tube

Straight Seam Welded Steel Tube: Engineered for Durability and Performance

Straight seam welded steel tubes, also known as ERW Longitudinal Welded Pipe, are fundamental components in modern construction and industrial applications. The defining characteristic of a Straight Welded Seam Steel Pipe is its single, linear weld seam running parallel to its length, created through precise manufacturing processes like high-frequency electric resistance welding. This method produces a Longitudinal Seam Welded Tube with excellent dimensional accuracy, a smooth internal surface, and consistent wall thickness. The strength and reliability of an Electric Resistance Welded Straight Pipe make it a cost-effective and versatile solution for fluid transportation, structural frameworks, and mechanical parts.

The manufacturing of a straight seam welded steel tube begins with high-quality steel coil, which is uncoiled, leveled, and formed through a series of rolls into a cylindrical shape. The critical step is the welding process, where the open edges are precisely heated and fused under pressure to create a strong, homogeneous bond. This weld seam is often heat-treated to normalize the metallurgical structure, enhancing its strength and making it comparable to the parent metal. Following welding, the straight seam welded steel tube undergoes sizing to achieve exact outer diameter specifications and is then cut to the required lengths. Rigorous non-destructive testing, including hydrostatic testing and ultrasonic inspection, is conducted to ensure every tube meets stringent quality and safety standards, guaranteeing leak-proof integrity and long-term performance.

Detailed Product Specifications

Our straight seam welded steel tubes are available in a comprehensive range to meet diverse project requirements.

Standard Specifications & Materials

Standards: ASTM A53, ASTM A500, ASTM A513, API 5L, EN 10219, EN 10255, JIS G3444, JIS G3452.
Common Materials: Carbon Steel (Grade A, B, C), Low Alloy Steel (Grade X42 to X70), Stainless Steel (304, 316).
Welding Process: High-Frequency Electric Resistance Welding (HF-ERW).
End Finish: Plain End, Beveled End, Threaded (Couplings available).
Surface Treatment: Black (Mill Varnish), Galvanized (Hot-Dip or Electro), Painted, Oiled.

Size & Dimensional Range

Outer Diameter (OD)	Wall Thickness (WT)	Length	Tolerance
1/2 inch (21.3 mm) to 24 inches (610 mm)	SCH 10, SCH 40, SCH 80, STD, XS	Single Random: 5-7m Double Random: 11-13m Fixed Length: Up to 18m	OD: ±0.5% WT: ±10%
Metric Sizes: 20mm to 508mm	1.0mm to 12.7mm	Custom lengths available upon request	Length: +10mm / -0mm

Key Mechanical & Chemical Properties

Property	Typical Value (ASTM A53 Gr. B)	Test Method
Tensile Strength	≥ 415 MPa (60,200 psi)	ASTM A370
Yield Strength	≥ 240 MPa (35,000 psi)	ASTM A370
Elongation	≥ 20%	ASTM A370
Carbon Content (Max)	0.30%	ASTM A751
Manganese Content (Max)	1.20%	ASTM A751
Hydrostatic Test Pressure	Minimum 1000 psi for STD pipe	ASTM A53 / API 5L

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Straight Seam Welded Steel Tube