steel pipe supplier_LSAW Pipe

china LSAW pipe supplier

LSAW Steel Pipe (Longitudinal Submerged Arc Welded Pipe) , DSAW Pipe, SAWL Pipe

Out Diameter: 219.1mm ~1626mm
Wall Thickness: 6mm ~75mm
Length: 3 ~ 18 mtrs

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Standard & Specifications of LSAW Pipe 

ProcedureLSAW (Longitudinally Submerged Arc Welding)
Dimensions219.1mm ~1626mm
8″ ~ 64″
DN200~ DN1600
Thickness6mm ~75mm
Unit Length                                                 3 ~ 18 mtrs
StandardsAPI 5L
JIS G3101
AWWA C200-97
Surface CoatingVarnishing, Oiling, Hot Dip Galvanizing
FBE, 2PP, 3PP, 2PE, 3PE
End TypePlain, Bevelled, Threaded, Grooved
Joint MethodFitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
Pipe MachiningWelding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding
ApplicationOil & Gas, Water Transmission, Solar Energy, Fire Fighting, Construction, Piling Work, Mechanical Engineering, Fabrication

What is LSAW Pipe?

LSAW (SAWL) carbon steel pipe welds steel plates that have been hot rolled using JCOE, UOE, or COE forming process.

LSAW (Longitudinal double submerge arc welding) is a circular arc method used to weld carbon and low alloy steels at low hydrogen concentrations. It differs from the more conventional single or differential-current SAW processes in that it employs both an AC frequency current and a high voltage direct current electrode. A DC electrode guarantees that the arc vortex forms a completely closed circuit and avoids any contact with the metal base material, allowing for far more control over penetration levels and weld quality.

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What is LSAW Pipe

The application of LSAW Pipe

LSAW pipe has found widespread use in the oil and gas pipelines, which require pipes with particularly large diameters, thick wall thicknesses, and high strengths in order to efficiently transport hydrocarbons over great distances. In the meanwhile, LSAW pipe comes highly recommended for a variety of applications including weight bearing piles, combination wall piles, water treatment, the thermal sector, bridge construction, and others.

UOE LSAW Pipe Manufacturing Process

The term UOE is the abbreviation for U-O-E, which is a method used for the production of longitudinally welded large diameter pipes. The production process of UOE pipes is divided into three steps: pre-bending, forming, and longitudinal welding. First, the plate is pre-bent by different radii by a variety of forming presses. After that, it will be deformed into U-shape and O-shape by a specific forming press. Finally, these two pre-shaped plates are welded together in an LSAW process to form a final tube with satisfactory wall thicknesses.

UOE LSAW Pipe Manufacturing Process

JCOE LSAW Pipe Manufacturing Process

The JCOE pipe is a kind of special pipe that is manufactured by connecting two pipes into a J shape, bending them into a C shape, bending them into an O-shape, and then arc welding the abutting edges together. The JCOE pipe has the same function as ordinary pipes but with improved quality, better processability, and more convenient transportation. This creates an interior-facing square or rectangular channel for the wrapped forming core material and an exterior-facing curved surface. The body is expanded by high-pressure air cylinders to control dimensions.

JCOE LSAW Pipe Manufacturing Process

COE LSAW Pipe Manufacturing Process

In the Electric Resistance Welding process, ERW pipe is made by shaping a flat sheet of steel into a cylindrical shape first. A current is passed between the steel cylinder’s two edges to heat the steel to the point where the edges are pressed together with no welding material required.

COE LSAW Pipe Manufacturing Process

LSAW Pipe vs SSAW Pipe

LSAW and SSAW are SAW (submerged arc welded) pipe variations. The distinction between them is the technique in which they are welded. In LSAW pipes, the welding is longitudinal, meaning that steel (hot-rolled coil plate) is rolled into a pipe and the seam is longitudinally welded. In SSAW, steel coils are spirally welded, like a helix, such that the coil (strip) adopts the shape of a pipe. SAW pipes are mostly used for transporting oil and gas.


  • Relatively Expensive In Price
  • Welding Direction: Longitudinal Direction
  • Production Efficiency:Low Efficiency
  • Outer Diameter: 16 Inch To 60 Inch
  • Main Application: Medium/High Pressure
  • Thickness Tolerance: Relatively Accurate
  • Geometry Accuracy: High


  • Low Cost
  • Welding Direction: Spiral Direction
  • Production Efficiency:High Efficiency
  • Outer Diameter: 20 Inch To 100 Inch
  • Main Application: Construction
  • Thickness Tolerance: Relatively Accurate
  • Geometry Accuracy: Low

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