Description
Factory-Direct LSAW Pipe Supply — Own steel mill and fabrication workshop under one quality system ensure full material traceability from raw plate to finished Q235 Q345 LSAW submerged arc welded steel pipe.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 Q345 Longitudinal Seam Submerged Arc Welded Steel Pipe |
| Product Type | Longitudinal Seam Submerged Arc Welded (LSAW) Steel Pipe |
| Steel Grade | Q235, Q345 |
| Standard | GB, API |
| Section Shape | Round |
| Outer Diameter | 10–2620 mm |
| Wall Thickness | 0.5–80 mm |
| Length | 6 m / 12 m or as required |
| Technique | Hot Rolled / Longitudinal Seam Submerged Arc Welded |
| Surface Treatment | Oiled / Coating / Thread / Groove / Beveled |
| Tolerance | ±1% |
| Ends | Threaded / Grooved / Beveled |
| Application | Structure Pipe / Oil Drill / Port Construction / Piling |
| MOQ | 25 tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Port & Marine Engineering | Piling foundations, dock fender systems, quay wall structures |
| Oil & Gas Infrastructure | Drill casing, fluid transport lines, wellhead support columns |
| Industrial Construction | Factory frame columns, equipment support platforms, conveyor gantries |
| Civil Infrastructure | Bridge pier casings, foundation bored piles, sound barrier posts |
What Negative Wall Tolerance Does to a Piling Budget
A pipe that passes mill gate but fails site acceptance costs more than the pipe itself.
When overseas buyers source a Q235 Q345 LSAW submerged arc welded steel pipe from fragmented suppliers, the steel plate origin often disappears somewhere between the rolling mill and the welding line. Third-party inspectors flag missing heat numbers, dimensional checks reveal wall thickness drifting beyond ±1%, and entire shipments get held at port because the mill test certificate does not match the physical material [NEED_CITE: material traceability requirements for structural steel piling]. For port construction and piling projects where every millimeter of wall thickness directly affects load-bearing calculation, this gap between documentation and reality turns a routine delivery into a project-delay crisis.
How OD 10–2620 mm Range Serves Piling and Structural Frameworks
The 10–2620 mm outer diameter span of this Q235 Q345 LSAW submerged arc welded steel pipe covers everything from small-diameter utility casings to large-bore piling tubes for marine foundations. Wall thickness from 0.5 to 80 mm lets engineers select the right section modulus without over-ordering heavier grades. On a recent Southeast Asian port project, the client needed 12 m fixed-length Q345 pipes with beveled ends ready for on-site butt welding — our own rolling and welding lines produced them to drawing spec, and the shop drawings were approved before the first plate was cut.
Engineering Compliance Across GB and API Standards
This LSAW submerged arc welded steel pipe is manufactured per GB and API standards, with welding procedures qualified per approved WPS and PQR records. For projects targeting European or North American markets, the Q235 and Q345 grades can be cross-referenced against equivalent international specifications [NEED_CITE: steel grade equivalence between GB Q series and EN ASTM standards]. Surface treatment choices — oiled for temporary corrosion protection during transit, coating for long-term exposure, or beveled/threaded/grooved ends for specific connection methods — are selected based on the installation environment and joining method specified in the project drawings.
Understanding Q235 vs Q345 in Submerged Arc Welding
Q235 and Q345 belong to the Chinese GB/T 1591 carbon and low-alloy structural steel series. Q345 offers higher yield strength than Q235, making it the preferred choice for load-bearing piling and heavy structural frames where section weight must be minimized without sacrificing capacity. The longitudinal seam submerged arc welding process produces deep, consistent penetration along the full pipe length — critical for maintaining structural integrity under axial and lateral loads. Hot rolling the plate before forming ensures uniform grain structure, while the ±1% dimensional tolerance keeps weight calculations reliable for engineering estimates. Multiple end finishes — threaded for mechanical coupling, grooved for clamp connection, beveled for butt welding — allow the same pipe body to serve different connection systems on the same project.
Hidden Costs When Material Traceability Breaks Down
Ordering a Q235 Q345 LSAW submerged arc welded steel pipe without verified mill test certificates means the welding procedure qualification, chemical composition, and mechanical properties exist only on paper — if that paper even arrives. Projects subject to third-party inspection by SGS or BV will reject pipes where heat numbers on the pipe body do not match the accompanying documentation. Customs authorities in the EU and Middle East increasingly require full material traceability chains, and a missing link in that chain means the container sits at port while the buyer scrambles for retroactive certification [NEED_CITE: customs documentation requirements for imported structural steel pipes]. The real cost is not the pipe price difference — it is the crane standing idle, the welders waiting, and the liquidated damages clock ticking.
Why Source Your LSAW Pipe From a Vertically Integrated Mill
Our fabrication division operates under the same roof as the steel production facility, meaning every Q235 Q345 LSAW submerged arc welded steel pipe we deliver carries a continuous material chain from raw slab to finished pipe. The welding shop uses certified procedures with qualified welders, and every heat of steel is traceable back to the mill pour. With over 2,800 raw material specifications in stock, we eliminate the common bottleneck where fabricators wait weeks for third-party plate delivery. Full quality documentation — WPS, PQR, weld maps, dimensional inspection reports, and coating certificates — is prepared as a standard package, not an afterthought. Professional loading plans handle the oversized cargo logistics that 2620 mm OD pipes demand, and our export team manages the complete documentation set from commercial invoice to certificate of origin.
Documentation & Compliance
- Mill test certificate documenting Q235 and Q345 chemical composition and mechanical properties per GB and API standards, with heat number traceability
- API compliance certificate confirming longitudinal seam submerged arc welding procedures meet applicable standard requirements
- ISO 9001 quality management system certificate covering the integrated steel production and fabrication process
- SGS or BV third-party inspection report available for dimensional verification, welding quality assessment, and coating thickness measurement
- Weld maps and WPS/PQR records for every production lot, linking each pipe to its qualified welding procedure
- Full customs documentation package including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Q235 and Q345 LSAW pipes bundled with steel strip ties and edge protectors to prevent coating damage and maintain bundle integrity during ocean transit
- Oiled surface treatment applied before bundling to provide temporary corrosion protection for the 0.5–80 mm wall thickness range during storage and shipping
- Loading plans optimized for 6 m and 12 m standard lengths, with oversized 2620 mm OD pipes loaded on flat racks or breakbulk when container dimensions are exceeded
- Custom cutting to project-specified lengths available, with beveled, threaded, or grooved ends protected by plastic caps before packing
- Heat number and steel grade stenciled on each pipe end for on-site identification and traceability verification during installation
- FOB, CIF, and CFR delivery terms available, with door-to-door logistics coordination for port construction and piling project sites
Start Your LSAW Pipe Inquiry With Drawings and Specifications
Submit your project drawings in PDF or DWG format along with the required steel grade, outer diameter, wall thickness, length, end finish, and destination port. Our engineering team reviews the specifications and returns a detailed quotation covering material, fabrication, coating, packing, and shipping within 24 hours, along with a shop drawing timeline and production schedule.
Get Your LSAW Pipe Quote With Full Mill Documentation
Send your project specifications and drawings to receive a detailed quotation and mill test certificate preview.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
