LSAW Longitudinal Submerged Arc Welded Steel Pipe

LSAW steel pipe is a kind of large diameter steel pipe, which is mainly used for long-distance transportation of oil, natural gas and other fluids. Its manufacturing process begins with hot rolled steel plate, which is molded into a cylinder by UOE (sequentially bent into U-shape, O-shape and then enlarged) or JCOE (rolled edges and then sequentially bent into J-shape, C-shape, O-shape and then enlarged), and then finally welded inside and outside the weld seam by Submerged Arc Welding (SAW) technology, where the arc is covered by a layer of flux during the welding process.

Core Application Areas of LSAW Steel Pipe 

With excellent pressure capacity, deformation resistance and long life characteristics, LSAW steel pipe (LSAW) has become the material of choice for demanding projects, mainly in:

Energy transportation backbone network

Land and sea oil/gas pipelines: transporting high-pressure crude oil, natural gas and refined oil products, suitable for thousands of kilometers of long-distance pipelines (such as the West-East Natural Gas Pipeline Project).

Technical support: wall thickness up to 40mm or more, pressure resistance grade over X80 (yield strength ≥555MPa)

Mining and industrial transportation

High wear-resistant slurry pipeline: transportation of abrasive slurry (solid-liquid mixture material) such as ore, tailings, etc., resisting corrosion by particle scouring.

Process piping systems: high-temperature and high-pressure scenarios such as cracking units in refineries, reactors in chemical plants, etc., to meet the demand for thick-walled (>25mm).

Major infrastructure

Offshore engineering: offshore platform conduit racks, monopile wind power foundations (up to 10 meters in diameter), resistance to seawater corrosion and wave impact.

Building structures: pile foundations for cross-sea bridges, core barrels for ultra-high-rise buildings, providing super-strong axial bearing capacity (e.g. Hong Kong-Zhuhai-Macao Bridge steel pipe composite piles).

Water conservancy and public works

Trunk water pipeline network: large-scale water transfer project pressure pipeline (e.g. South-to-North Water Transfer), the inner wall can be made food-grade anti-corrosion treatment.

Foundation piling: anti-settlement piles for wharves, deep-water harbors, etc., penetrating complex geological layers.

Wide Range of Diameters and Wall Thicknesses: Suitable for high-pressure, large-volume transport.

High Strength and Toughness: Excellent mechanical properties due to quality steel plates and welding.

Good Weldability: The SAW process produces high-quality, consistent welds.

Straight Seam: Allows for easier inspection and coating.

Versatile Applications: Used in demanding onshore and offshore projects.

Our LSAW pipes are manufactured to the highest industry standards, ensuring reliability and performance for critical infrastructure projects worldwide. We offer customization to meet specific project requirements.