LSAW steel pipes

What is LSAW steel pipe?

LSAW is an abbreviation for Longitudinal Submerged Arc Welding. The LSAW pipe production process begins with a plate, which is formed into a pipe by joining each side of the plate/strip longitudinally according to the required diameter, then welded with filler metal.
LSAW steel pipe is produced using a single plate as a raw material, where the steel plate is pressed (rolled) into a tube blank in a mold or forming machine. It then adopts double-sided submerged arc welding (often referred to as DSAW) and expands the diameter. The weld integrity is appropriately strong with uniformity and compactness.

LSAW Steel Pipe is categorized into UOE, RBE, and JCOE steel pipe based on its different forming methods.

UOE Steel Pipes

Outside Diameter：Φ508mm- 1118mm (20″- 44″)

Wall Thickness: 6.0-25.4mm 1/4″-1″
Quality Standards: API、DNV、ISO、DEP、EN、ASTM、DIN、BS、JIS、GB、CSA
Length: 9-12.3m (30′- 40′)
Grades: API 5L A-X90,GB/T9711 L190-L625

JCOE Steel Pipes

Outside Diameter：Φ406mm- 1626mm (16″ – 64″ )
Wall Thickness：6.0- 75mm (1/4″ – 3″ )
Quality Standards：API、DNV、ISO、DEP、EN、ASTM、DIN、BS、JIS、GB、CSA
Length：3-12.5m ( 10″- 41″ )
Grades：API 5L A-X100, GB/T9711 L190-L690

Quality Control Plan(QCP/ITP)：

100% ultrasonic flaw detection for the material plate;

100% automatic on-line UT test after welding;

100% whole-length seam X-ray test;

100% inside weld line industrial TV test;

100% hydrostatic test;

100% automatic on-line seam UT test after hydrostatic test, expanding;

100% X-ray test and make X-ray film or picture record on pipe ends;

100% pipe appearance and plate appearance inspection

Tolerance of Outside Diameter and Wall Thickness

Key Applications:

• Oil & Gas: Main pipelines (trunk lines), offshore rigs, drilling, transporting hydrocarbons.
• Construction: Building frames, scaffolding, stadium structures, highway supports, foundations.
• Infrastructure: Bridges, tunnels, water/wastewater systems, irrigation.
• Marine: Submarine pipelines, offshore platforms, cable installation.
• Energy: Conveying steam, coolants in power plants (thermal, nuclear).
• Mining: Slurry, ore, and mineral transport.
• Automotive: High-performance exhaust systems (less common, but possible).

Why LSAW steel Pipes?

• High Strength & Durability: Ideal for heavy loads and high-pressure environments.
• Large Diameters: Suitable for transporting large volumes of fluids and gases.
• Excellent Weld Quality: Strong, uniform welds from the submerged arc process.
• Long Lengths: Reduces joints, improving pipeline integrity and installation.
• Versatility: Can handle high pressures, extreme temperatures, and corrosive conditions, often with protective coatings.

Packing