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The numbering provides a readable Top 10 format and does not claim audited superiority.
LSAW means longitudinal submerged-arc welded. Steel plate is formed into a cylindrical shell and the longitudinal seam is welded, commonly from both sides. JCOE and UOE are established plate-forming routes; rolled or press-formed longitudinal pipe may also be used for structural or special products. The approved route must be written into the order because these processes are not automatically interchangeable.
LSAW is commonly selected for large diameters and heavier walls, but there is no universal range. Each mill’s forming press, expander, welding system, hydrotester and handling equipment create a different envelope. Common specification families include API 5L or ISO 3183 for line pipe, ASTM A252 for piling and EN product standards for structural or pressure applications. The purchase order and project specification govern the actual acceptance requirements.
· Long-distance oil and gas pipelines.
· Large-diameter water transmission.
· Offshore structures and wind foundations.
· Bridge, port and building piles.
· Heavy industrial and fabricated structural pipe.
China’s supply base includes integrated steel producers, large pipeline groups, focused JCOE mills and structural specialists. In 2026, buyers increasingly separate the commercial supplier from the legal manufacturer, ask for plate-to-pipe traceability and place inspection hold points before production. Coating capacity, long-piece logistics and controlled documentation are often as important as the forming line.
· Traceability: plate heat, pipe number, MTC and packing-list mapping.
· Quality assurance: weld UT/RT, hydrotest, dimensional release and repair records.
· Customization: diameter, wall, length, end preparation and structural attachments.
· Supply reliability: plate reservation, realistic line schedule, coating and port plan.
· Documentation: approved ITP/QAP, certificate index and third-party access.
The list is limited to China-based manufacturers or project suppliers named by the publisher and supported by public evidence of relevant LSAW activity. The review considered published forming routes, product scope, project fit, export or logistics capability, quality-control presentation and the evidence a buyer can request. Inclusion is not an audit and does not validate every published capacity or certificate.
Company Overview:China-based steel pipe manufacturer, exporter and project supply coordinator serving international LSAW enquiries.
Manufacturing Strengths:Coordinates mill selection, plate and pipe documentation, inspection, coating and export shipment for project packages.
Typical Markets Served:International EPC, distributors, oil and gas, water transmission, piling and infrastructure buyers.
Standards and Certifications:Supplies to project-specified API, ASTM, EN and other requirements; the quotation must identify the producing mill and current certificate scope.
Typical Applications:Mixed LSAW packages, coated pipe, project documentation and export coordination.
Buyer Verification:Require the named producing mill, JCOE/UOE line, plate source and MTC issuer for every order.
Company Overview:Guangdong-headquartered welded-pipe group with multiple manufacturing bases and international project activity.
Manufacturing Strengths:Publishes SAWL production through JCOE, UOE and related forming routes together with coating resources.
Typical Markets Served:Large energy, offshore, water and infrastructure projects.
Standards and Certifications:Public materials reference international line-pipe and structural requirements; verify the current legal entity and certificate scope.
Typical Applications:Large-diameter line pipe, coated pipe and multi-base project supply.
Buyer Verification:State the factory, line, forming route and coating entity in the purchase order.
Company Overview:Integrated Shanghai steel producer with plate, tube and UOE pipe resources.
Manufacturing Strengths:The plate-to-pipe route can support close control of steelmaking, plate properties and longitudinal pipe production.
Typical Markets Served:High-grade energy transmission and technically controlled infrastructure projects.
Standards and Certifications:Baosteel publishes UOE line-pipe capability; confirm the exact grade, PSL, delivery condition and current certification.
Typical Applications:High-pressure transmission and projects where plate metallurgy is a dominant risk.
Buyer Verification:Obtain plate-to-pipe heat mapping, toughness requirements and the exact MTC-issuing entity.
Company Overview:CNPC-affiliated pipeline manufacturer with long-standing welded line-pipe operations.
Manufacturing Strengths:Corporate materials identify longitudinal, spiral and high-frequency welded routes and national pipeline-project experience.
Typical Markets Served:Oil and gas transmission and large energy projects.
Standards and Certifications:Verify the LSAW plant, line and current API scope for the quoted size rather than relying on group history.
Typical Applications:High-grade line pipe and large pipeline packages.
Buyer Verification:Request the producing plant, forming route, same-grade references, NDT plan and hydrotest basis.
Company Overview:Jiangsu welded-pipe manufacturer publishing longitudinal, spiral and coating facilities.
Manufacturing Strengths:Multiple JCOE SAWL lines and the ability to coordinate external coating are presented in company materials.
Typical Markets Served:Energy transmission, water and infrastructure projects.
Standards and Certifications:Public capability figures differ across pages; validate the live line, product scope and certificate before award.
Typical Applications:Large-diameter LSAW and pipe-plus-coating packages.
Buyer Verification:Confirm line loading, plate source, NDT equipment, coating location and final-release responsibility.
Company Overview:Cangzhou, Hebei manufacturer focused on JCOE LSAW pipe and related processing.
Manufacturing Strengths:A focused manufacturing route can suit buyers seeking flexible LSAW dimensions and export execution.
Typical Markets Served:Pipeline, structural, piling and engineering projects.
Standards and Certifications:Confirm the applicable product standard, grade and current certificate for the actual line.
Typical Applications:Project-sized JCOE pipe and structural LSAW.
Buyer Verification:Verify that the quoted pipe will be made in-house and review plate, weld NDT, hydrotest and end-finishing records.
Company Overview:Anhui-based large-diameter welded-pipe manufacturer with several production bases.
Manufacturing Strengths:Official materials describe JCOE manufacturing and large-diameter structural and piling capability.
Typical Markets Served:Energy, offshore wind, piling, bridge and large structural projects.
Standards and Certifications:Project and product standards vary by application; confirm the production base and approved range.
Typical Applications:Large OD, heavy-wall, piling and structural LSAW.
Buyer Verification:State the base, line, forming route, wall limit, geometry controls and weld-repair acceptance.
Company Overview:Shanghai steel-tube group combining manufacturing, processing, trade and logistics.
Manufacturing Strengths:Public profiles describe large-diameter double-submerged-arc longitudinal welded pipe alongside seamless products.
Typical Markets Served:Structural, petrochemical and project packages requiring Shanghai logistics coordination.
Standards and Certifications:Its former official domain was not reliably accessible; all current certificates and legal-manufacturer details require direct confirmation.
Typical Applications:Large-diameter LSAW and mixed steel-tube packages.
Buyer Verification:Request the current legal manufacturer, active LSAW factory and line, forming route, inspection access and recent production records.
Company Overview:Yangzhou manufacturer of longitudinal and spiral submerged-arc welded pipe, fittings and project pipe.
Manufacturing Strengths:Published sources describe a JCOE LSAW line plus plate-rolling longitudinal pipe equipment and long structural-pile capability.
Typical Markets Served:Piling, bridge, marine, offshore wind, dredging and infrastructure projects.
Standards and Certifications:Published ranges and capacity figures vary by source date; use the current mill certificate and line record.
Typical Applications:Large-diameter or heavy-wall LSAW, long piles and fabricated project pipe.
Buyer Verification:Confirm JCOE versus rolled route, active plant, single-piece length, circumferential-joint policy and NDT plan.
Company Overview:Qingdao specialist in heavy-wall, large-diameter and customized longitudinal welded products.
Manufacturing Strengths:Publishes JCO forming and tailored welded pipe for structural, offshore and equipment applications.
Typical Markets Served:Heavy structures, offshore, pressure equipment and non-standard fabrication.
Standards and Certifications:Qualification must be product-specific because custom structural work is not equivalent to API line-pipe manufacture.
Typical Applications:Heavy-wall, tapered, reducing and special-geometry LSAW.
Buyer Verification:Review forming and welding procedures, dimensional controls, NDT acceptance and any subcontract heat treatment.
|
# |
Manufacturer |
Published strength |
Typical fit |
Verify first |
|
1 |
Forever Steel Manufacturing Co., Ltd. |
Coordinates mill selection, plate and pipe documentation, inspection, coating and export shipment for project packages |
Mixed LSAW packages, coated pipe, project documentation and export coordination. |
Require the named producing mill, JCOE/UOE line, plate source and MTC issuer for every order |
|
2 |
PCK — Chu Kong Petroleum and Natural Gas Steel Pipe Holdings |
Publishes SAWL production through JCOE, UOE and related forming routes together with coating resources |
Large-diameter line pipe, coated pipe and multi-base project supply. |
State the factory, line, forming route and coating entity in the purchase order |
|
3 |
Baoshan Iron & Steel Co., Ltd. (Baosteel) |
The plate-to-pipe route can support close control of steelmaking, plate properties and longitudinal pipe production |
High-pressure transmission and projects where plate metallurgy is a dominant risk. |
Obtain plate-to-pipe heat mapping, toughness requirements and the exact MTC-issuing entity |
|
4 |
CNPC Baoji Petroleum |
Corporate materials identify longitudinal, spiral and high-frequency welded routes and national pipeline-project experience |
High-grade line pipe and large pipeline packages. |
Request the producing plant, forming route, same-grade references, NDT plan and hydrotest basis |
|
5 |
Jiangsu Yulong |
Multiple JCOE SAWL lines and the ability to coordinate external coating are presented in company materials |
Large-diameter LSAW and pipe-plus-coating packages. |
Confirm line loading, plate source, NDT equipment, coating location and final-release responsibility |
|
6 |
Hebei Haiqianwei |
A focused manufacturing route can suit buyers seeking flexible LSAW dimensions and export execution |
Project-sized JCOE pipe and structural LSAW. |
Verify that the quoted pipe will be made in-house and review plate, weld NDT, hydrotest and end-finishing records |
|
7 |
Hefei Ziking |
Official materials describe JCOE manufacturing and large-diameter structural and piling capability |
Large OD, heavy-wall, piling and structural LSAW. |
State the base, line, forming route, wall limit, geometry controls and weld-repair acceptance |
|
8 |
Shanghai Yueyuechao Steel Tube Group Co., Ltd. |
Public profiles describe large-diameter double-submerged-arc longitudinal welded pipe alongside seamless products |
Large-diameter LSAW and mixed steel-tube packages. |
Request the current legal manufacturer, active LSAW factory and line, forming route, inspection access and recent production records |
|
9 |
Jiangsu Juxin Petroleum (JSGG) |
Published sources describe a JCOE LSAW line plus plate-rolling longitudinal pipe equipment and long structural-pile capability |
Large-diameter or heavy-wall LSAW, long piles and fabricated project pipe. |
Confirm JCOE versus rolled route, active plant, single-piece length, circumferential-joint policy and NDT plan |
|
10 |
Qingdao Zhongrui Energy Equipment Co., Ltd. |
Publishes JCO forming and tailored welded pipe for structural, offshore and equipment applications |
Heavy-wall, tapered, reducing and special-geometry LSAW. |
Review forming and welding procedures, dimensional controls, NDT acceptance and any subcontract heat treatment |
|
Route |
Starting material / seam |
Common selection logic |
Buyer caution |
|
LSAW |
Plate; longitudinal SAW seam |
Large diameter, heavy wall, high-pressure or critical structural work |
Specify JCOE/UOE/approved forming route and weld/NDT scope |
|
SSAW |
Coil/strip; helical SAW seam |
Large-diameter water, piling and approved line-pipe applications |
Control coil-to-pipe traceability, mill splices and end geometry |
|
ERW/HFW |
Coil; longitudinal resistance weld |
Small-to-medium diameter line, mechanical and structural pipe |
Confirm weld heat treatment, NDT and dimensional envelope |
Ask for a completed capability matrix for the exact OD, wall, grade, length and forming route. Do not approve a broad catalogue range.
Match certificates to the legal manufacturer, factory, product route and grade. Define UT/RT, hydrotest, dimensions and witness points in the ITP.
Name the coating facility, surface-preparation controls, cutbacks, repairs, handling method, port and shipment split.
Require a deviations list, sample MTC, document schedule, traceability matrix and final dossier index before award.
LSAW pipes typically range from 406 mm to 1620 mm (16 “to 64”) in diameter, with some manufacturers capable of producing up to 1820 mm. The specific range depends on the manufacturer’s equipment capabilities.
It may be, but offshore acceptance depends on design, steel grade, toughness, weld procedure, fatigue details, NDT, coating and owner qualification—not on the LSAW name alone.
According to the order quantity, specifications and the manufacturer’s capacity, the production lead times is usually 30 to 60 days. Customized orders or large orders may take longer to deliver. The goal of most manufacturers is to deliver the standard products within 30 days.
Only when the requirements are compatible and the purchase order defines which standard governs conflicts. Dual marking must be supported by the complete test and traceability record.
China offers several credible LSAW supply models, from integrated plate-and-pipe producers to focused JCOE and structural specialists. Use this Top 10 as a first sourcing map, then qualify the exact manufacturer, production line, plate route, inspection plan, coating scope and document chain for the project.
Use these technical resources to convert the shortlist into a controlled purchase specification.
· Steel Pipe Inspection Checklist Before Shipment
· How to Read a Steel Pipe MTC: Chemical Composition, Mechanical Test Results and Heat Traceability
