What is the Welded pipe?

Welded steel pipe is created using a flat steel plate or steel strip, and its manufacturing process results in a seam on its body. Specifically, when welded steel pipe is manufactured, a steel plate or strip is bent and subsequently welded into either a circular, traditional pipe shape or a square shape. LSAW pipe, SSAW pipe, and ERW pipe are all types of welded steel pipe that are categorized based on how they are welded. For instance, LSAW pipe is welded longitudinally, and SSAW pipe is spiral-welded. ERW pipe is electric resistance welded, which results in a seam that runs parallel along the pipe body.

No matter the type of welded steel pipe, production is quick and efficient and costs less than the production of alternatives like seamless steel pipe. Overall, welded steel pipe is an affordable, adaptable choice and can be used for a number of different purposes.

welded pipe specification

Welded Steel Pipe Applications

As mentioned, the uses of welded steel pipe are many. Below you’ll find some of the most popular applications for this type of steel pipe.

Water and Gas Transport

Welded steel pipe is excellent for transporting water, other fluids, and natural gas. Its affordable price makes it ideal for large-scale projects.

Pipe Casing

When drilled shafts are constructed, pipe casing (whether temporary or permanent) is needed, and welded steel pipe can be used for this purpose. When used as pipe casing, welded steel pipe adds support to a hole while construction in progress.

Bearing Piles

Welded steel pipe can be driven into the ground to help support and carry loads from big, heavy structures. When used as bearing piles, welded steel pipe may also be filled with concrete to boost strength.

Combi Walls

Welded steel pipe can be employed in the creation of combi walls, which serve as retaining structures. In combi walls, welded steel pipe is the king pile that is used in concert with steel sheet piles to form a strong, durable structure that can support significant loads.

Underground Utilities

Welded steel pipe can be used to assist when underground utilities are installed. When employed this way, hydraulic jacks drive sections of steel pipe between excavations, which are then conjoined with other sections of spliced pipe. Once the desired pipe structure is created, it is cleared and cleaned out to allow for a safe area for utility work.

Structural Sections

Welded steel pipe can be used to create large, open structures, including cofferdams. When used this way, it can offer an equal degree of bending resistance in every direction, which enables it to be resistant to buckling, even when substantially heavy loads are needing support across considerable lengths.

welded pipe vs seamless pipe

The seamless pipes have no smooth surface due to the extruded procedure. Also, it is very difficult to check and treat the internal surface as it is never exposed outside. The ERW Pipe and the other types of welded pipes are made from strips, sheets, and plates of a particular material. This allows for the surface to be polished before making the pipe. After the welding, if the diameter of the pipe is large enough, polish the internal surface. The seamless pipes can only be made up to a nominal pipe size of 24 inches.

Product Specification and Size

Product Name Executive Standard Dimension (mm) Steel Code / Steel Grade
Casting API 5CT Ø48.3~273 x WT2.77~11.43 J55, K55, N80, L80
Tubing API 5CT Ø48.3~273 x WT2.77~11.43 J55, K55, N80, L80, H40
Line Pipes API 5L Ø60.3~273.1 x WT2.77~12.7 A25, A, B, X42, X46, X52, X56, X60, X65, X70, X80
Electric-Resistance-Welded Steel Pipes ASTM A135 Ø42.2~114.3 x WT2.11~2.63 A
ERW and Hot-dip Galvanized Steel Pipes ASTM A53 Ø21.3~273 x WT2.11~12.7 A, B
Pipes for Piling Usage ASTM A252 Ø219.1~508 x WT3.6~12.7 Gr.2, Gr.3
Tubes for General Structural Purpose ASTM A500 Ø21.3~273 x WT2.11~12.7 Gr.2, Gr.3
Square Pipes for General Structural Purpose ASTM A500 25 x 25~160 x 160 x WT1.2~8.0 Carbon Steel
Threaded Steel Pipes DIN 2440 Ø21~164 x WT2.65~4.85 Carbon Steel
Screwed and Socketed Steel Tubes BS 1387 Ø21.4~113.9 x WT2~3.6 Carbon Steel
Scaffolding Pipes EN 39 Ø48.3 x WT3.2~4 Carbon Steel
Carbon Steel Tubes for General Structure Purpose JIS G3444 Ø21.7~216.3 x WT2.0~6.0 Carbon Steel
Carbon Steel Tubes for Machine Structure Purpose JIS G3445 Ø15~76 x WT0.7~3.0 STKM11A, STKM13A
Carbon Steel Pipes for Ordinary Piping JIS G3452 Ø21.9~216.3 x WT2.8~5.8 Carbon Steel
Carbon Steel Pipes for Pressure Service JIS G3454 Ø21.7~216.3 x WT2.8~7.1 Carbon Steel
Carbon Steel Rigid Steel Conduits JIS G8305 Ø21~113.4 x WT1.2~3.5 G16~G104, C19~C75, E19~E75
Carbon Steel Rectangular Pipes for General Structure JIS G3466 16 x 16~150 x 150 x WT0.7~6 Carbon Steel


Carbon steel welded pipe and tube are used in high-pressure conditions. They are highly resistant to shock and vibration, making them ideal to transport fluids. Carbon steel pipes are widely used in a number of industries, such as transporting water and sewage, oil and gas industries, boiler and condenser tubes, high-pressure applications, and chemical processing.

– Transporting water and sewage
– Oil and gas industries
– Boiler and condenser tubes
– High-pressure applications
– Chemical processing