steel pipe supplier_LSAW Pipe

china LSAW Steel pipe manufacturer & exporter

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

LSAW (Longitudinal double submerge arc welding) steel pipe is also a type of welded pipe known for its straight seam construction. These pipes are made by bending steel sheets into cylindrical form and welded longitudinally along the length of the pipe. They’re used in infrastructure development, construction sites and for oil and gas transportation.

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Specifications of LSAW Steel Pipe

  • Name: LSAW Steel Pipe (Longitudinally Submerged Arc Welding)
  • Standard: API 5L, ASTM A53, EN10025, DIN17100, JIS G3101, ASTM A252, AWWA C200-97
  • Grade: GR.A, GR.B, GR.1, GR.2, GR.3, X42, X46, X52, X56, X60, X70, Q235, Q345, S355J0H, S355JR
  • Sizes:
    Out diameter: 8″ ~ 64″( 219.1mm ~1626mm, DN200~ DN1600)
    Thickness: 6mm ~ 75mm(SCH 5S~SCH XXS)
  • Surface Coating: Varnishing, Oiling, Hot Dip Galvanizing (FBE, 2PP, 3PP, 2PE, 3PE)
  • End Type: Plain, Bevelled, Threaded, Grooved
  • Joint Method: Fitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
  • Pipe Machining: Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding
LSAW Pipe-lsaw steel pipe Specifications-UNIASEN

LSAW steel pipe features

lsaw pipe manufacturer-LSAW steel pipe features

Large Diameter

Our LSAW steel pipes are known for their capability to be manufactured in large diameters. These pipes are good for moving a lot of liquids or gases in certain situations.

Thick Wall Thickness

UNIASEN LSAW steel pipes are available with thick wall thickness. They are suitable for high-pressure applications, such as in the oil and gas industry.

LSAW steel pipe features


LSAW pipes are a good choice for projects that need to transport fluids or gases over long distances. This is because they can be made in long lengths, which saves money.

LSAW Pipe manufacturer and supplier-LSAW steel pipe features

Resistant to Corrosion

LSAW steel pipes can resist corrosion well, which makes them suitable for tough environments.

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. Specific applications in the following industries:

Oil and Gas Transportation

LSAW pipes are widely used in oil fields, natural gas production and transmission pipeline systems.

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Hydraulic Conveyance

LSAW pipes can be used in large-scale water conservancy projects, such as reservoirs, canals and urban water supply systems.

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Bridge Construction

Including bridge support structures, bridge piers and bridge decks.

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Building Structures

Such as large buildings, commercial centers and industrial facilities. The high strength and durability of LSAW pipes are suitable for building structures.

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What is LSAW Pipe?

LSAW (SAWL) carbon steel pipes are fabricated by welding hot-rolled steel plates using the JCOE or UOE forming process.

LSAW (Longitudinal double submerge arc welding) is a welding method used for joining different pieces of metal. LSAW pipes are different from the pipes manufactured using other SAW processes in a way that it uses both AC and DC currents. The DC voltage is there to ensure that current flows in a closed path and its resultant effect is zero. This doesn’t let the current come in contact with metal. As a result, the quality of pipes remains unmatched. These pipes are also used in construction sites.

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What is LSAW Pipe

UOE LSAW Pipe Manufacturing Process

The UOE method is used for the production of dimensionally precise LSAW pipes. The first step is to prepare steel plates, and shape them in ‘U’ form with the help of a U-press or cold rolling. The next step is to convert U-shaped plates into O-shape by curving the open ends inward. These O-shaped plates are then welded longitudinally for creating a smooth seam. After that, hydraulic or mechanical methods are used to expand the O-shaped pipes. This method is quite effective and has been in use for a long time.

LSAW UOE 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.

LSAW JCOE Pipe manufacturing process

LSAW Steel Pipe VS SSAW Steel Pipe

Both types of pipes use SAW technique. But their manufacturing methods are different, SSAW forms the plates into a spiral and then weld along the length to make spiral seam. While LSAW bends steel plates into cylindrical shape and then welds it. LSAW pipes are better to be used at construction sites due to their stiffness, while SSAW pipes are flexible due to their spiral shape. But both types of pipes have their own respective advantages and disadvantages.

LSAW Steel Pipe

  • LSAW pipes are quite expensive
  • Welded in longitudinal direction
  • Not much efficient
  • Outer diameter ranges between 16 Inch and 60 Inch
  • Mainly used for medium/high pressure applications
  • Thickness tolerance is moderately precise

SSAW Steel Pipe

  • SSAW pipes are cheaper compared to LSAW pipes
  • Welded in spiral direction
  • Highly efficient
  • Outer diameter ranges between 20 Inch and 100 Inch
  • Mainly used at construction sites
  • Thickness tolerance is moderately precise
  • Geometry accuracy is low

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