Carbon Steel LSAW Pipes

Carbon Steel LSAW pipes are high-performance steel piping solution manufactured from hot-rolled steel plates by Longitudinally Submerged Arc Welding. LSAW pipes are distinguished by their ability to accommodate large diameters and thick walls, making them the preferred choice for high-pressure, heavy-duty applications in the oil and gas, petrochemical, and structural engineering sectors

The production of Carbon Steel LSAW Pipes involves a rigorous sequence of steps designed to maximize strength and integrity:

‌Plate Preparation:‌ High-quality carbon steel plates undergo ultrasonic testing to detect any internal defects before processing .

‌Forming (JCOE):‌ The steel plate is progressively formed into a "J," then "C," and finally an "O" shape using specialized molding machines. This asymptotic bending method minimizes residual stress and maintains excellent pipe geometry .

‌Pre-Welding:‌ A preliminary weld is applied to hold the shape, often using MAG (Metal Active Gas) welding, ensuring stability before final welding .

‌Submerged Arc Welding:‌ Both the inner and outer seams are welded using tandem multi-wire submerged arc welding. This technique provides deep penetration and superior weld toughness .

‌Mechanical Expansion:‌ The pipe undergoes overall mechanical expansion treatment. This critical step reduces internal stress, prevents stress corrosion cracking, and ensures high dimensional accuracy

‌Superior Strength and Durability:‌ The use of thick steel plates and double-sided submerged arc welding results in pipes with high tensile strength and excellent ductility .

‌Large Diameter Capability:‌ Unlike ERW pipes, LSAW technology can produce very large diameters with thick walls, essential for major transmission pipelines .

‌High Dimensional Accuracy:‌ The mechanical expansion process ensures tight tolerances on outer diameter and wall thickness, facilitating easier on-site welding and installation .

‌Excellent Weld Quality:‌ The submerged arc welding process protects the molten pool from atmospheric contamination, resulting in clean, defect-free welds that are easy to inspect via NDT methods .

‌Cost-Effectiveness:‌ For large-diameter applications, LSAW pipes offer a more economical solution compared to seamless pipes while maintaining comparable performance characteristics

To enhance durability in various environments, Carbon Steel LSAW Pipes can be supplied with protective coatings.

Common options include Black painting, Fusion Bonded Epoxy (FBE), 3-layer Polyethylene (3PE), 3-layer Polypropylene (3PP),

coal tar epoxy, and bitumen coating.‌

‌Oil and Gas Transmission:‌ Primary choice for long-distance crude oil, natural gas, and petroleum product pipelines due to high-pressure resistance .

‌Petrochemical Industry:‌ Used for fluid transport in refineries and chemical plants .

‌Water and Sewage Systems:‌ Large-diameter water transmission lines and sewage outfalls .

‌Structural Engineering:‌ Piling for bridges, offshore platforms, and heavy structural supports .

‌Power Generation:‌ Boiler tubes and hydraulic systems in power plants

Carbon Steel LSAW Pipes undergoe strict quality control per Standard requirements
* Hydrostatic Pressure Testing
* Non-Destructive Testing (X-Ray, Ultrasonic)

* Chemical composition test
* Mechanical Property Testing
* Dimension & Visual Inspection
* Full Traceability (Mill Test Certificates 3.1 provided)

* High quality assured & Fast delivery.
* Rich experiences(23+years) in Technics/Production/Post-sales.
* Technical & full set of documents support (API 5L, ISO, MTC, ITP &MPS .etc)

Kevin

Tianjin shenzhoutong steel pipe co.,ltd

kevin@tjshenzhoutong.com

Mob/whatsapp/wechat +86 15267768016

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