LSAW Steel Pipe Manufacturer

· Outer diameter: 406 mm - 1626 mm (16" - 64").

· Wall thickness: 6.0 mm - 75 mm (1/4" - 3").

· Length: Usually 6 m /12 m .

· API 5L PSL1/PSL2: A, B, X42, X46, X52, X56, X60, X65, X70, etc.

· GB/T 9711 Grades: L190 - L690.

· EN10217/EN10219: S235JR, S275JR, S355JR, etc.

· ASTM A53: Including grades A, B, C, suitable for various general - purpose applications.

· ASTM A252: This standard covers welded and seamless steel pipe piles used in construction projects. It defines the requirements for nominal wall       thickness, dimensions, and mechanical properties.

★Plate Cutting – High-quality stainless steel plates are cut precisely to required width.

★Edge Milling – Plate edges are prepared for consistent welding quality.

★Forming – Plates are formed into round pipes via UOE or JCOE method (as per order).

★Submerged Arc Welding – Internal and external welds completed using advanced SAW technology.

★Heat Treatment – Solution annealing and stress-relief processes to ensure pipe durability.

★Weld Seam Inspection – 100% NDT (X-ray, UT) for seam reliability.

★Hydro Testing & Final Inspection – Pressure tests and dimensional verification per standard.

★All products are manufactured according to international norms:

ASME B36.10M / B36.19M

ASTM A358 / A778

EN 10217-7

ISO 9001:2015 / PED / CE Certification

★Each pipe undergoes:

100% NDT testing

Hydrostatic pressure test

Visual & dimensional inspection

Optional: PMI, intergranular corrosion test, third-party inspection (SGS, BV)

★Higher welding quality: The submerged - arc welding process used in LSAW steel pipes results in better weld quality, with fewer welding defects such as pores and slag inclusions. The weld seam is straight, which reduces the probability of defects compared to spiral - welded pipes.

★ Better dimensional accuracy: Through processes like expansion, LSAW steel pipes have higher dimensional accuracy, which is beneficial for on - site installation and connection. The control of diameter and perimeter is more precise.

★ Superior mechanical properties: The manufacturing process of LSAW steel pipes can refine the steel grains, making the steel structure denser and improving the mechanical properties such as strength and toughness. It can better withstand the pressure and external forces in pipeline transportation.

★Less impact on anti - corrosion coating: The straight weld seam has less impact on the quality of the anti - corrosion coating material, which helps to improve the anti - corrosion performance of the pipeline and prolong its service life.

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