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

Thick Wall Straight Seam Welded Pipe
Xinlida manufacturer’s China Thick Wall Straight Seam Welded Pipe is a pipe which is welded along a straight line after bending steel plate or steel strip into a circular or square section.Its wall thickness is usually large and can withstand high internal or external pressures.The welding seam of this kind of pipe is linear, the welding process is relatively simple, and the production efficiency is high.
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.
Hot-Dip Galvanized Square and Rectangular Tubes
Tianjin Xinlida Steel Pipe Co., Ltd. has been deeply involved in the steel pipe industry for many years, establishing an integrated business structure encompassing domestic production, overseas bases, and global trade. Leveraging its formal import and export qualifications, the company has cultivated the cross-border trade market, with products exported to Southeast Asia, the Middle East, and other regions. Equipped with intelligent production equipment, the company boasts an annual production capacity of 50 million tons. Its production processes and equipment meet international standards, with its Hot-dip galvanized square and rectangular tubes being a primary export product. The core advantages of this pipe lie in its excellent corrosion and rust resistance and robust workmanship, perfectly meeting the needs of various overseas engineering, construction, energy, and transportation projects. The factory also supports flexible order adjustments and customized processing, maintaining ample stock and efficient delivery. This effectively solves procurement challenges for buyers, such as unstable supply, specification discrepancies, tight deadlines, and the susceptibility to rust and loss of outdoor pipes, making it a reliable choice for domestic and international customers procuring square and rectangular tubes.
Galvanized Square And Rectangular Steel Pipe
Xinlida’s China Galvanized Square And Rectangular Steel Pipe is square or rectangular section steel pipe, the surface after hot galvanizing treatment.This treatment gives it excellent corrosion resistance, rust resistance, greatly extending the service life.Moreover, hot-dip galvanizing also enhances the hardness of steel pipes, so that they can maintain stable performance in complex environments.
High-temperature resistant hot-rolled seamless steel pipe
High-temperature resistant hot-rolled seamless steel pipe, as an important branch of special steel pipes, achieve stable performance in high-temperature environments through hot rolling processes and special alloy ratios, making them an indispensable key material in industries such as energy, chemicals, and power. Their manufacturing process involves continuous rolling of steel billets heated to high temperatures, eliminating the need for welding and ensuring the pipe's structural density and resistance to thermal deformation. Tianjin Xinlida Steel Pipe Co., Ltd., deeply rooted in the steel pipe manufacturing field, leverages intelligent production equipment and advanced processes to incorporate the research and development and production of high-temperature resistant hot-rolled seamless steel pipes into its core business, providing global customers with high-quality products that meet international standards.
Heat-resistant cold-rolled seamless steel pipe
In the vast field of steel pipes, Heat-resistant cold-rolled seamless steel pipe, with their unique properties, have become an indispensable key material for many industries. Tianjin Xinlida Steel Pipe Co., Ltd. focuses on its core steel pipe business and has achieved remarkable results in the research, development, production, and trade of heat-resistant cold-rolled seamless steel pipes.

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Straight Seam Welded Steel Tube