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-rolled seamless steel pipes for fire protection pipelines
In the field of fire safety, Hot-rolled seamless steel pipes for fire protection pipelines play a crucial role, serving as key components to ensure the stable operation of fire protection systems. Tianjin Xinlida Steel Pipe Co., Ltd. has deep expertise in the steel pipe business and boasts outstanding performance in the production and supply of hot-rolled seamless steel pipes for fire protection pipelines.
Precision cold-rolled seamless steel pipe
In the industrial manufacturing sector, Precision cold-rolled seamless steel pipe, with their high precision and high performance, have become a key basic material for industries such as energy, transportation, and construction. Tianjin Xinlida Steel Pipe Co., Ltd. has been deeply involved in steel pipe manufacturing for many years, providing global customers with precision steel pipe solutions that meet international standards through intelligent production systems and a global layout.
Galvanized Square And Rectangular Steel Tube
Among many China Galvanized Square And Rectangular Steel Tube manufacturers, Tianjin Xinlida Steel Pipe Co., Ltd., as an enterprise established in 2015, focuses on steel pipe manufacturing, processing and sales. With a number of qualification certificates and administrative licenses, it has established a good reputation in the industry and is fully competitive.
Black Seamless Steel Pipe
Xinlida supplier Black Seamless Steel Pipe is a seamless hollow circular steel made by hot-rolling process. With its own characteristics, it has been widely used in multiple industries such as petroleum, chemical engineering, power, mechanical manufacturing, and construction.
Spiral welded pipe for steel structures
Tianjin Xinlida Steel Pipe Co., Ltd. focuses on its core steel pipe business, with Spiral welded pipe for steel structures being one of its core products. The products utilize mature welding technology, resulting in robust structures, excellent load-bearing capacity, and adaptability to various needs in steel structure construction, meeting relevant quality standards. Leveraging its import and export qualifications, the company engages in cross-border trade of spiral welded pipes for steel structures, covering overseas markets such as Southeast Asia and the Middle East. Its reliable quality and attentive service have earned recognition from customers both domestically and internationally. The products are highly adaptable, with specifications adjustable to meet the specific requirements of steel structure projects. The company provides efficient services throughout the entire process, from product selection to cross-border delivery, accurately matching needs and ensuring efficient order fulfillment, showcasing the company's strength and service advantages.
Thin-Walled Straight Seam Welded Pipe
Xinlida’s China Thin-Walled Straight Seam Welded Pipe is a common metal pipe, its wall thickness is relatively thin, made by welding process.This kind of pipe is widely used in many fields, and its manufacturing process involves many links such as material selection, molding, welding and post-treatment.Thin-walled welded pipes refer to welded steel pipes with thin wall thickness, usually with a wall thickness of a few millimeters.

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Straight Seam Welded Steel Tube