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

Hot Products

Hot-Dip Galvanized Angle Steel
Tianjin Xinlida Steel Pipe Co., Ltd. is a leading manufacturer specializing in steel structure profiles. Leveraging its intelligent production base with an annual capacity of 50 million tons and a comprehensive business system integrating domestic production, overseas bases, and global trade, the company provides engineering support services across multiple sectors including construction, energy, and transportation. Its products are exported to Southeast Asia, the Middle East, and other overseas markets, meeting the procurement needs of various large-scale domestic and international projects. Holding formal import and export qualifications, the company adheres to international production standards throughout the entire process, from raw material selection to finished product quality control. With stable product quality and efficient supply services, it has earned the long-term trust of domestic and international buyers, making it a reliable supplier of steel structure materials for engineering projects.
Galvanized U-channel
Tianjin Xinlida Steel Pipe Co., Ltd. has long specialized in the manufacturing of steel pipes and structural steel, establishing a comprehensive business ecosystem that integrates domestic production, overseas bases, and global trade. Our galvanized U-channels offer a core competitive advantage by combining long-lasting corrosion resistance—achieved through hot-dip galvanizing that meets national standards—with a high-strength, one-piece formed structure. This solution effectively addresses four major industry pain points: structural corrosion, insufficient load-bearing capacity, lengthy construction periods, and high maintenance costs—challenges often encountered in coastal saline-alkali areas, humid mountainous regions, and environments subject to rain, snow, and low temperatures. We operate our own intelligent production facilities with substantial annual capacity and a full suite of advanced structural steel processing equipment. Adhering to the GB/T13912 galvanizing standard, we manufacture all U-channels using Q235B and Q355B grade steel, while offering services such as custom specifications, precision cutting, and prefabricated processing. Clients—whether for domestic projects or overseas trade—benefit from rapid production scheduling and flexible order adjustments; profile specifications and order quantities can be modified during production to meet project timelines and minimize inventory waste.
Galvanized Cold-Rolled Seamless Steel Pipe
Xinlida's China Galvanized Cold-Rolled Seamless Steel Pipe is a seamless steel pipe produced by the cold-rolling process. Compared with hot-rolled steel pipes, the cold-rolling process endows it with higher precision and better surface quality. The wall thickness of its pipes is uniform and the dimensional accuracy is high. Generally, the outer diameter tolerance is controlled within ±0.1mm, and the wall thickness tolerance is about ±0.05mm. It can meet the demands of high-precision processing. Meanwhile, the surface of cold-rolled seamless steel pipes is smooth, which reduces the resistance of fluid flow in the pipeline and improves the transportation efficiency. They are widely used in industries such as petroleum, natural gas, chemical engineering, boilers, and mechanical manufacturing.
Galvanized Channel Steel
Tianjin Xinlida Steel Pipe Co., Ltd., established in 2015, has been deeply involved in the steel pipe industry for over a decade, building a complete industrial chain system of "domestic production + overseas bases + global trade." Relying on international manufacturing standards and a stable supply chain, we have launched galvanized channel steel as our core product. As a global steel pipe solutions provider, our galvanized channel steel integrates national standard precision, high-quality Q235B/Q355B materials, hot-dip galvanizing for long-lasting corrosion protection, full-specification stock availability, and non-standard customization capabilities. It directly addresses five core pain points in engineering procurement: incomplete specifications, substandard materials, poor corrosion resistance, slow delivery, and installation rework. We provide highly reliable structural materials for the construction, energy, transportation, and machinery manufacturing industries, while simultaneously adapting to the needs of supporting steel materials such as galvanized flat steel, providing a one-stop solution for global customers' material needs in all scenarios of steel structure load-bearing, support, and frame construction.
Anti-corrosion spiral welded pipe
Tianjin Xinlida Steel Pipe Co., Ltd. focuses on its core steel pipe business, with anti-corrosion spiral welded pipe as its flagship product. Relying on mature production technology, its pipes possess excellent anti-corrosion performance and robust structural strength, making them adaptable to various complex working conditions. The company has established a business system of "domestic production + overseas bases + global trade," providing comprehensive supply guarantees for anti-corrosion spiral welded pipes. Domestic production bases ensure ample supply, and customized specifications can be provided to meet the needs of various sectors such as construction, energy, and transportation, offering flexible and convenient services. The company emphasizes product quality control while optimizing service processes, providing efficient services throughout the entire process from product customization and sourcing to cross-border delivery. This not only meets the procurement needs of various domestic industries but also continuously expands into overseas markets, demonstrating the company's strength.
Rectangular Tube
The Rectangular Tube producted by Xinlida supplier is a kind of hollow pipe with square or rectangular cross section, which plays a key role in many industrial and civil fields. If you are interested in our products, you are welcome to cooperate with us.

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Straight Seam Welded Steel Tube