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Longitudinally Submerged Arc Welding Steel Pipe

LSAW (Longitudinally Submerged Arc Welded Steel pipes) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production.
Product Details:

Longitudinally submerged arc welding steel pipe


Low price LSAW Steel Pipe Piles / longitudinal seam submerged arc welded steel pipe


Longitudinal Submerged-Arc Welded Steel Pipe

Out Diameter:

219.1mm -1820mm (8” -72”)

Wall Thickness:

5.0 -50mm


Up to 12 M


API 5L, API 5CT, ASTM 53, EN10217, DIN 2458. IS 3589, GB/T3091, GB/T9711
Out Diameter: 355.6mm – 1820mm (14” -160”)

Steel Grade:

API 5L: GR B, X42,X46, X56, X60,X65,X70
EN: S275, S275JR, S355JRH, S355J2H
GB: Q195, Q215, Q235, Q345, L175, L210, L245, L320, L360- L555


Fusion bond Epoxy coating, Coal Tar Epoxy, 3PE, Vanish Coating, Bitumen Coating, Black Oil coating as per customer’s requirement

Application range:

low pressure liquid delivery, such as water, gas, and oil.


Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.

Mill Test Certificate:

EN 10204/3.1B

LSAW pipes

LSAW (Longitudinally Submerged Arc Welded Steel pipes) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production.

Most common Weld steel pipes

Sunny Steel produce an extensive selection of welded steel pipe including ERW, HFI, EFW, LSAW, DSAW and UOE type carbon steel pipe along with their respective flanges and fittings.


Electric Resistance Welded Pipe

ERW pipes means Electric Resistance Welded Pipes.

ERW pipe technical requirements


High Frequency Induction (HFI) Welded Pipe

In High Frequency Induction (HFI) Welded Pipe production process, hot rolled steel coils are fed with a high capacity accumulator in order to achieve continuous welding.


Spiral submerged-arc welding pipes (SSAW)

Spiral submerged arc welding(SSAW) is its forward direction and forming tube centerline hose reel molding angle (adjustable), side molding edge welding and weld them into a spiral.


Electric Fusion Welded Pipes (EFW)

The EFW pipe divison consists of a JCO forming press, helical / spiral mill, inside and outside welding system, heat treatment furnace and testing facilities.


Longitudinally Submerged Arc Welded (LSAW)

LSAW (Longitudinally Submerged Arc Welded Steel pipes) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume)...


Double Submerged Arc Welded (DSAW)

Double Submerged Arc Welded (DSAW) steel pipe is available in straight and spiral welded formats and used in a variety of applications.


UOE (Uing and Oing forming) Pipes

UOE(Uing and Oing forming) is a method used for production of longitudinally welded large diameter pipes.


J-ing, C-ing and O-ing pipes

The mill adopts continuous axis contorting J-C-O(J-ing, C-ing and O-ing)process with characteristics of high forming accuracy and efficiency as well as balanced distribution of forming stress.


Anti-corrosion steel pipe

Anti-corrosion steel pipe is processed through the preservation process, which can effectively prevent or slow down the process in the transport and use of chemical or electrochemical corrosion reaction of steel pipe.


Hot Dip Galvanized Steel Pipe

Hot-dip galvanizing (HDG), as referenced is the process of dipping fabricated steel into a kettle or vat of molten zinc.


Special Welded Tubes

We can produce precision and high-frequency welded steel tubes and pipes with all possible dimensions and shapes available.


Rectangular Hollow Sections

Rectangular steel tube comes in different sizes, specifications and wall thicknesses.

Longitudinally Submerged Arc Welded Steel pipes list

Oil & Gas pipeline

for Construction

Roller Pipe

Thick walled pipe

Mechanical Tolling pipe

UOE pipe

LSAW Steel Pipe For Oil & Gas pipeline

Material: As per API 5L, the steel grade covers X80 and lower,
Size Range:Dimension: Outer diameter: Ф406-1524mm, | Wall thickness: 6-40mm | Unit length: 8-12.1m


Material X52 (Ф812.8*19.1)


Material X60 (Ф762*17.5)


Material X70 (Ф712*15.9)


Material X70 (Ф753*17.9)


Material X52 (Ф912.8*21.3)



Longitudinally Submerged Arc Welded Process Flow
(LSAW Pipes)with JCOE forming mode



Difference between SSAW steel pipe and LSAW steel pipe

Difference between LSAW steel pipe and SSAW steel pipe are followings below:


+ LSAW pipe


+ SSAW pipes

Our technical support for ERW , SSAW & LSAW stel pipe

Mainly as a field gathering pipe and internal high-pressure natural gas pipeline of small-caliber, long-distance pipelines for oil and gas a small number, the vast majority of long-distance pipeline is the use of high-frequency straight seam welded pipe (ERW), spiral submerged arc welded pipe (SSAW), LSAW steel pipe (LSAW) three.

Inspection & Test Plan for LSAW

LSAW (Inspection & Test Plan for LSAW) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production.

The purpose of cold expansion for lsaw steel pipe

After cold expansion for lsaw steel pipe, steel tube and pipe end diameter will increase by about one percent difference in diameter of the diameter, roundness, and the pipe ends are greatly improved, also have greatly improved the straightness of the steel pipe, steel pipea length of about 0.5% reduction in wall thickness decreases by about 0.8%.

Q345B steel polishing method


Polishing means a processing method by the action of mechanical, chemical or electrochemical, lower the q345b steel pipe surface roughness, to obtain a bright and smooth surface, and surface modification process making use of a flexible polishing tools and polishing abrasive particles or other media on the workpiece.

LSAW steel pipe industry usage

LSAW pipes are mainly used as long distance transportation pipeline for oil, gas, liquid coal etc. on land and offshore.
And also can be applied as construction pipes on offshore platform, power station, petrochemistry and city construction etc.

Advantages of LSAW pipe

In the long-distance pipeline construction, pipe-line account for a large proportion, generally 35% to 40% of line pipe accounts for investment projects total investment.

The LSAW steel pipe producing equipments

The major equipment such as Plate Edge Milling Machine, Plate Edge Crimping Machine, Pipe Forming Press, Tack Welding Machine and Pipe Expander all adopt the technology and equipment of SMS MEER. The SMS MEER is the most famous special manufacturer to design and manufacture the whole production line equipment for LSAW pipe in the world . They have supplied all kinds of steel pipe manufacturing equipment for plenty of LSAW pipe manufacturers in the world and have got a very good reputation in this field.

LSAW produce Technology Center


As a superior technology center has been establish ed including the domestic first-class chenical laboratory,mechanics laboratory, the metallography test laboratory and welding laboratory with advanced equipments for inspection and test Accordingly,it can provide a comprehensive inspection for the raw material and the finished products so that it guaran test the high quality of products.

LSAW pipes Size range

Legnth:8-12.15m Material: API 5L Gr.B-X80, Standard: API spec. 5L; GB9711.1-97


Weled steel pipe specification, Standard and identification

Electrical resistance welding


Welded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.

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