Welded steel pipe is made using flat steel plates or strips, the manufacturing process of which creates joints in its body. Specifically, in the manufacture of welded steel pipe, the steel plate or strip is bent and then welded into a round, conventional tube shape or square. lsaw pipe, ssaw pipe and erw pipe are all welded steel pipes classified according to their welding method. For example, LSAW pipe is longitudinally welded and SSAW pipe is spirally welded. ERW pipe is resistance welded, which creates a seam that runs parallel along the body of the pipe.
Regardless of the type of welded pipe, production is fast and efficient and costs less than the production of alternatives such as seamless steel. Overall, welded steel pipe is an economical and adaptable option for many different applications.
The common materials of welded pipes are: Q235A, Q235C, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X60, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
The billet used for welded steel pipe is steel plate or strip steel, which is divided into furnace welded pipe, electric welded (resistance welded) pipe and automatic electric arc welded pipe because of its different welding process. Because of its different welding forms are divided into two kinds of straight seam welded pipe and spiral welded pipe. Because of its end shape, it is divided into round welded pipe and shaped (square, flat, etc.) welded pipe. Welded pipes are divided into the following varieties because of their different materials and uses.
GB/T3091-2008 (welded steel pipe for low-pressure fluid transmission): mainly used for the transmission of water, gas, air, oil and heating hot water or steam and other general lower pressure fluids and other purposes tube. Its representative material is: Q235A grade steel.
GB/T14291-2006 (mining fluid transportation welded steel pipe): mainly used for mine pressure wind, drainage, shaft release gas with straight seam welded steel pipe. Its representative material Q235A, B grade steel.
GB/T12770-2002 (stainless steel welded steel pipe for mechanical structure): mainly used for machinery, automobiles, bicycles, furniture, hotels and restaurants decoration and other mechanical parts and structural components. Its representative materials 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
GB/T12771-1991 (stainless steel welded steel pipe for fluid transportation): mainly used to transport low pressure corrosive media. Representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.
Also, welded stainless steel pipe for decoration (GB/T 18705-2002), welded stainless steel pipe for building decoration (JG/T 3030-1995), and welded steel pipe for heat exchanger (YB4103-2000).
JIS, AISI, ASTM, GB, DIN, EN
200 Series/300 Series/400 series
Welding Line Type
Furniture or handrail or fence
Cold Rolled Hot Rolled
Standard Sea-worthy Packing
Water Pressure Test
6-711mm, or customized
0.5-40mm, or customized
As mentioned earlier, there are many applications for welded steel pipe. You will find some of the most popular applications for this type of steel pipe below.
- Water and gas transportation
Welded steel pipe is perfect for transporting water, other fluids and natural gas. Its affordable price makes it ideal for large projects.
When constructing a drilling well, casing is required (either temporary or permanent) and welded steel pipe can be used for this purpose. When used as casing, welded steel pipe adds support to the hole during construction.
- Load-bearing piles
Welded steel pipe can be driven into the ground to help support and carry the loads of large, heavy structures. When used as load bearing piles, welded steel pipes can also be filled with concrete for added strength.
Welded steel pipes can be used to build combination walls as retaining structures. In combination walls, welded steel pipes are used as primary piles in conjunction with sheet piles to create a strong and durable structure that can support large loads.
- Underground Utilities
The installation of underground utilities can be aided by the use of drilled and top-welded steel pipes. When used in this manner, hydraulic jacks drive the steel pipe sections between excavations, which are then connected to the rest of the spliced pipe. Once the desired pipe structure is created, it is cleaned and cleared to allow for safe areas for utility work.
- Structural sections
Welded steel pipe can be used to build large open structures, including cofferdams. When used in this manner, it provides the same degree of flexural resistance in all directions, which allows it to resist buckling, even when considerable loads need to be supported across a considerable length.
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