LSAW Longitudinal Welded Steel Pipe, also known as Longitudinal Submerged Arc Welded Steel Pipe, is a large diameter welded steel pipe manufactured from steel plates through JCOE or UOE forming processes and longitudinal submerged arc welding technology. It features high strength, excellent welding quality, precise dimensions and strong pressure resistance, making it widely used in oil and gas transportation, water pipelines, structural engineering and heavy construction projects. As a professional LSAW steel pipe manufacturer and supplier, we provide longitudinal welded steel pipes in various diameters, wall thicknesses and lengths according to customer requirements. Our products are available in carbon steel grades including Q235, Q355, ASTM A252, ASTM A53, API 5L Grade B, X42, X52, X60 and other equivalent materials. The pipes are manufactured according to international standards such as API, ASTM, EN, DIN, JIS, GB and ISO. LSAW steel pipes are known for their high dimensional accuracy, uniform wall thickness and excellent mechanical properties. Compared with SSAW pipes, LSAW pipes are commonly preferred for applications requiring higher strength, stricter tolerances and reliable performance under high-pressure conditions. Our longitudinal welded steel pipes are widely used in oil and gas pipelines, water transmission systems, piling projects, bridge structures, offshore engineering, power plants and industrial facilities. We provide customized solutions including different pipe specifications, surface treatments, anti-corrosion coatings and packaging options. With advanced production equipment, strict quality control and professional export experience, we supply reliable LSAW Longitudinal Welded Steel Pipe solutions for customers worldwide.




■ Product Parameters
Item | Specification |
Product Name | LSAW Longitudinal Submerged Arc Welded Steel Pipe |
Abbreviation | LSAW Steel Pipe |
Manufacturing Process | JCOE / UOE Forming + Double-Sided Submerged Arc Welding (DSAW) |
Pipe Type | Longitudinal Welded Steel Pipe |
Steel Grade | Q235B, Q345B, Q355B, L245, L290, L360, L390, L415, L450, L485, Gr.A, Gr.B, X42, X46, X52, X56, X60, X65, X70 |
Material Standard | ASTM A53, ASTM A252, ASTM A671, ASTM A672, API 5L PSL1/PSL2, EN10217, EN10219, ISO 3183, GB/T 3091, GB/T 9711 |
Outside Diameter (OD) | 406.4mm–1626mm (16"–64") |
Wall Thickness (WT) | 6mm–60mm |
Pipe Length | 5.8m, 6m, 9m, 10m, 11.8m, 12m, 12.5m, or Customized |
Pipe End | Plain End (PE), Beveled End (BE), Grooved End, Threaded End (Optional) |
Surface Treatment | Bare, Black Painted, Anti-rust Oil, 3PE Coating, FBE Coating, Coal Tar Epoxy, Varnish, Hot-dip Galvanized (if required) |
Coating Thickness | According to customer requirements or relevant standards |
Internal Coating | Epoxy, Cement Mortar Lining, Liquid Epoxy, FBE (Optional) |
External Coating | FBE, 2PE, 3PE, 3PP, Coal Tar Epoxy, Bitumen, Black Paint |
Welding Method | Double-Sided Submerged Arc Welding |
Weld Seam | Single Longitudinal Weld |
Tolerance | According to API 5L, ASTM, EN, or Customer Specification |
Production Capacity | 5,000–15,000 Tons/Month |
Heat Treatment | Normalizing, Stress Relief (Optional) |
Hydrostatic Test | Available |
Ultrasonic Testing (UT) | 100% Available |
Radiographic Testing (RT) | Available Upon Request |
Eddy Current Test (ECT) | Optional |
Magnetic Particle Inspection (MPI) | Optional |
Mechanical Test | Tensile Test, Flattening Test, Bend Test, Impact Test |
Chemical Analysis | Available |
Third-party Inspection | SGS, BV, TUV, Intertek, DNV, Lloyd's Register |
Certificate | ISO 9001, CE, API 5L, EN10204 3.1/3.2, MTC |
Packing | Steel Strips Bundling (Small Sizes), Individual Pipe, Plastic Caps, Waterproof Packing, Wooden Supports, Export Standard Packing |
Loading Method | Bulk Vessel, Break Bulk, Container (when applicable) |
Application | Oil Transmission, Natural Gas Pipeline, Water Transmission, Slurry Pipeline, Piling Projects, Bridge Construction, Offshore Engineering, Structural Steel Projects, Port Construction, Power Plant, Petrochemical Industry |
Service | Cutting, Beveling, End Facing, Drilling, Coating, Marking, Custom Processing |
OEM / ODM | Accepted |
MOQ | 5 Tons |
Trade Terms | EXW, FOB, CFR, CIF, DDP |
Payment Terms | T/T, L/C at Sight |
Delivery Time | Normally 10–30 Days According to Quantity |
Export Markets | Southeast Asia, Middle East, Europe, North America, South America, Africa, Oceania |
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■ FAQ
Q: Are you a trading company or a manufacturer ?
A: We are manufacturer. Every month, we do a procurement for a massive number of steel material from Chinese state owned mill. The total value of steel processing equipment is more than 30 million dollars. Our major products cover all category of steel industry, and it is totally compatible to all kind of world steel standard.
Q: Do you have large amount of steel products in stock ?
A: Yes, we do. In large-scale indoor warehouses, the total stock value is over 150 millions dollar.
Q: Do you provide the samples ? Free or Extra ?
A: It is free, depend on the value of the sample. The cost of the freight would be charge.
Q: How long is the delivery time ?
A: Officially, it is within 7 days. Actually, we can deliver within 3 days. Customized products or non-standard size products would be taken 10-30 days to deliver, depend on the production cycle. Generally, most of the products finished and delivered within 20 days.
Q: Do you accept the third party inspection ?
A: Absolutely yes!
Q: How could you guarantee your products ?
A: Each batch of products must have its own factory inspection report. If the third-party inspection report of the product you purchased does not match our factory inspection report, we will resend the goods, and we will carry all the costs by ourselves.
Q: How can I get your quotation as soon as possible ?
A: You may have many methods to contact us. Email and fax will be checked within 12 hours, and Skype, WeChat and WhatsApp will be online in 24/7. Please send us your requirement, attaching specification (Steel grade, dimension, quantity, destination port) or any you are concerned, you will obtain a competitive price and supply solution soon.
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