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Location: HOME > PRODUCTS > Carbon steel > Carbon Steel Pipe > Longitudinal Submerged Arc Welded (LSAW) Heavy Wall Pipe

Longitudinal Submerged Arc Welded (LSAW) Heavy Wall Pipe

LSAW (Longitudinally Submerged Arc Welded) thick-walled pipes are manufactured from full-sized steel plates. Through the JCOE or UOE forming process and double-sided submerged arc welding, a single longitudinal weld seam is created. This welding method offers deep penetration and excellent weld toughness, while the resulting pipes feature high precision in terms of roundness and straightness—making them ideal for large-diameter, extra-thick-walled, high-pressure, and heavy-duty applications.

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LSAW heavy wall pipe is produced from solid heavy steel plate, formed by JCOE/UOE process and welded with double-sided submerged arc welding to form one longitudinal seam. Made from whole steel plate without strip lap joint, uniform material property. Double-sided submerged arc welding provides deep penetration and excellent weld toughness. It has high roundness & straightness accuracy, suitable for large diameter, extra heavy wall, high pressure and heavy load projects. It is premium welded pipe for overseas large infrastructure, oil & gas and offshore engineering.

Product Name		Heavy Wall Steel Pipe
More materials		S235JR（EN10219），S355JR / S355J2H（EN10219），A500 Gr.B / Gr.C（ASTM A500），Q235B / Q355B（GB/T3091），API 5L Gr.B（ERW/SSAW），A53 Gr.B（ASTM A53），EN10217 P235TR2
Specification	Small and medium diameter	Outer Diameter (OD)	60.3 mm (2") – 610 mm (24")
		Wall Thickness (WT)	8 mm – 20 mm (thick-walled range)
	Large Diameter	Outer Diameter (OD)	219.1 mm (8") – 2540 mm (up to a maximum of 3500 mm)
		Wall Thickness (WT):	8 mm – 25.4 mm
	Large Diameter + Extra-Thick Wall	Outer Diameter (OD)	406 mm – 1626 mm
		Wall Thickness (WT)	10 mm – 44.5 mm (can be produced with an extra-thick wall of up to 75 mm)
Length		6/12m（Current inventory on hand and ready for use）, Length can be customized
Surface treatment		Black Pipe，Varnish / Anti-rust Paint，Anti-rust Oil / Preservative Oil，Sand Blasting / Shot Blasting，Hot Dipped Galvanized，Painting / Coating
Delivery Condition		Hot Rolled / Hot Rolled Seamless (HR), Cold Drawn / Cold Drawn (CD), Normalized / N, Annealed / A, Quenched and Tempered / Quenched and Tempered (QT)
Standard		ASTM, AISI, JIS, GB, DIN, EN, etc.
Scope of Application		Widely used in sectors such as oil and gas transmission, structural steel for construction, pile foundation casings, bridge and transport infrastructure, engineering machinery, municipal water systems, port and offshore engineering, and thermal power towers and vessels.
Certificate		ISO, SGS, BV, etc.
Production Technology		Hot Rolling, Cold Rolling
Edge Processing		Edging, Trimming

Application

Oil & gas transmission: onshore & subsea high-pressure oil/gas trunk pipeline

Large infrastructure: steel columns for cross-sea bridge & large venue, heavy pile casing

Municipal works: large diameter water & slurry pressure pipeline

Offshore & port: offshore platform piping, port foundation piles

Others: thermal pipeline, pressure vessel mother pipe, heavy equipment cylinder

LSAW heavy wall pipe is manufactured by JCOE/UOE forming of solid steel plate plus double-sided submerged arc welding. It features large OD, extra heavy wall option, reliable weld and good roundness. Widely used for high-pressure oil & gas pipeline, large steel structure, offshore engineering and heavy piling. Main grades: API5L Gr.B/X42/X52/X60/X70, S355J2H.

Common Export Grades

API 5L Gr.B / X42 / X52 / X60 / X65 / X70 (PSL1 / PSL2), mainstream for oil & gas projects

S355JR / S355J2H (EN10219 / EN10217), European standard for large structure & pressure service

A671 / A672 (ASTM), US standard for high-temperature pressure LSAW pipe

Q355B (GB), cost-effective domestic grade for large diameter structural LSAW

Applicable standard, PSL level (API5L), MTC, SGS/BV third-party inspection
Dimensional tolerance: OD roundness, wall thickness tolerance, straightness (key indicators for LSAW)
Weld inspection: UT ultrasonic, RT radiographic test, hydrostatic test (mandatory for pipeline), Charpy impact test for low temperature service
Forming process: JCOE / UOE, often required for high-end projects
Pipe end treatment, bevel angle & machining precision
Anti-corrosion coating options: 3PE, FBE, 2PE, cement mortar lining
Marking, packing, weight settlement, MOQ, delivery time and trade terms

Payment Methods

Flexible payment terms available: T/T and L/C. For new clients, 30% advance payment for production, balance against copy of B/L. L/C is acceptable for large & regular orders to secure both parties.

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Warehousing Management

Before each batch of steel leaves the factory, a complete process inspection is strictly carried out. From chemical composition, mechanical properties to dimensional tolerance and surface quality, each item is carefully checked to ensure compliance with national standards and export regulations. At the same time, the quantity, packaging and rust prevention treatment are also verified. An original factory warranty certificate is attached, guaranteeing the quality. Before shipment, inspection photos are provided. Any non-compliant items will not be released, and the quality is fully controllable throughout the process. This ensures your overseas purchasing is safe and worry-free.

All items are visually inspected before delivery. No cracks, deformation, rust, scratches or cutting marks are allowed; edges must be smooth. Only visually sound products will be shipped.

Thickness, width, length, wall thickness, outer diameter have been measured. Straightness, curvature, torsion, diagonal tolerance all meet the corresponding tolerance requirements.

Quality inspection includes: mechanical property tests (yield strength, tensile strength), elongation rate, impact energy, hardness testing, chemical composition testing, process performance testing, etc.

Inspection according to packaging requirements: secure binding, moisture-proof film, rust-proof paper, export fumigation/fumigation-free wooden crates, shipping marks, gross weight, net weight, etc.

We will provide full reception services to support the customers' on-site inspection of the goods.

Hot Rolling Production Line

Cold rolling precision processing

Cold drawing/cold rolling line

Hot Rolling Production Line

Hot rolling production line (producing hot-rolled coils/medium-thick plates, thickness 2–60mm)

Cold rolling precision processing

(Producing ultra-thin / high-precision / shiny panels, with thickness ranging from 0.1 to 3mm, for high-end products)
Cold drawing/cold rolling line

(High-precision cold-drawn round steel, square steel, hexagonal steel, and special-shaped bars)

Cold drawing/cold rolling line

(High-precision cold-drawn round steel, square steel, hexagonal steel, and special-shaped bars)

Warehousing Management

A ten-thousand-ton standardized warehouse with grid-based zoning and system positioning enables rapid material retrieval and reduces the time spent searching for materials.

Inbound inspection: Verify the physical items against the inbound form, inspect the appearance, dimensions, and labels. Once confirmed to be correct, the materials are entered into the ERP system and processed for storage.

Logistics and Global Delivery: Self-operated fleet + contracted logistics partners; expedited service available for urgent orders.

International Shipping: Supports FOB, CIF, DDP, and other trade terms, covering 100+ countries and regions.

Process: Booking → Trucking → Customs Declaration → Loading onto Ship/Aircraft → Bill of Lading Issuance → Document Delivery → Destination Port Customs Clearance (Optional) → Last-Mile Delivery.

Provides door-to-door one-stop logistics with full tracking to ensure safe and timely arrival of goods.

After-Sales Service and Traceability: Delivery receipts, logistics information, and quality inspection documents are sent to customers within 24 hours of shipment.

Established a full product lifecycle traceability system, allowing tracking of production, quality inspection, warehousing, and transportation records.

Follow-up inspection within 72 hours of arrival; rapid response and handling of quality issues; assistance in resolving customs clearance issues for foreign trade orders.

Packaging Method