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Welded steel pipe, also known as welded tube, is manufactured by forming steel plates or strips into a cylindrical shape and joining the seam using welding processes. Compared with seamless steel pipe, welded pipe offers advantages such as higher dimensional accuracy, uniform wall thickness, and lower production costs. It is widely used in fluid transportation, structural support, and machinery manufacturing. Common production methods include electric resistance welding (ERW), longitudinal submerged arc welding (LSAW), and high-frequency welding (HFW). In international trade, frequently used search terms such as “ERW steel pipe” help locate resistance-welded pipe products, while “LSAW steel pipe” is suitable for finding spiral welded pipe information.
Foreign grades of welded steel pipes are often based on ASTM or API standards. For example, ASTM A53 is a widely used grade for general piping systems, covering Types A and B; API 5L is specifically used for oil and gas transmission pipelines, with common grades including Gr.B, X42, X52, and X60. In addition, ASTM A500 is used for structural welded pipes, and ASTM A252 is for piling pipes. In overseas procurement, entering “API 5L pipe specification” allows quick access to technical parameters, while searching “ASTM A53 vs A500” helps compare the applicable scenarios of different grades.
Welded steel pipes are widely used in oil and gas transmission, urban water supply, sewage treatment, steel structure buildings, and machinery parts manufacturing. For example, API 5L welded pipes are commonly used in long-distance pipelines and oilfield gathering systems; ASTM A53 welded pipes are suitable for low-pressure steam, air, water, and gas pipelines; structural welded pipes (e.g., ASTM A500) are often used in building trusses, towers, and guardrails. In industrial maintenance and procurement, searching “carbon steel pipe for sale” helps quickly locate carbon steel welded pipe suppliers, while “welded steel pipe price per ton” is useful for cost comparison and budget evaluation.
With advances in welding technology, the application of welded steel pipes in high-pressure, corrosion-resistant, and low-temperature environments continues to expand. The emergence of double submerged arc welding (DSAW) and precision high-frequency welded pipes has further improved product performance. Internationally, searching “high frequency welded pipe” provides information on advanced welding processes, while “spiral steel pipe supplier” helps locate large-scale spiral welded pipe suppliers. In the future, welded steel pipes will continue to replace part of the seamless pipe market, especially in the construction, energy, and infrastructure sectors.
DN |
Welded steel pipe (ordinary) |
Welded steel pipe (thickened) |
Seamless steel pipe (hot rolled) |
Spiral welded steel pipe |
||||
pg≤1.0Mpa |
pg≤1.6Mpa |
pg≤2.5Mpa |
pg≤1.6Mpa |
|||||
D×∮ |
(Kg/m) |
D×∮ |
(Kg/m) |
D×∮ |
(Kg/m) |
D×∮ |
(Kg/m) |
|
DN15 |
21.3*2.75 |
1.25 |
21.3*3.25 |
1.44 |
---- |
---- |
---- |
---- |
DN20 |
26.8*2.75 |
1.63 |
26.8*3.5 |
2.01 |
---- |
---- |
---- |
---- |
DN25 |
33.5*3.25 |
2.42 |
33.5*4 |
2.91 |
32*3.5 |
2.46 |
---- |
---- |
DN32 |
42.3*3.25 |
3.13 |
42.3*4 |
3.77 |
38*3.5 |
2.98 |
---- |
---- |
DN40 |
48*3.5 |
3.84 |
48*4.25 |
4.58 |
45*3.5 |
3.58 |
---- |
---- |
DN50 |
60*3.5 |
4.88 |
60*4.5 |
6.16 |
57*3.5 |
4.62 |
---- |
---- |
DN65 |
75.5*3.75 |
6.64 |
75.5*4.5 |
7.88 |
73*4 |
6.81 |
---- |
---- |
DN80 |
88.5*4 |
8.34 |
88.5*4.75 |
9.81 |
89*4 |
8.38 |
---- |
---- |
DN100 |
114*4 |
10.85 |
114*5 |
13.44 |
108*4 |
10.26 |
---- |
---- |
DN125 |
140*4.5 |
15.04 |
140*4.5 |
18.24 |
133*4 |
12.72 |
---- |
---- |
DN150 |
165*4.5 |
17.81 |
165*5.5 |
21.63 |
159*4.5 |
17.14 |
168*5 |
20.1 |
DN200 |
---- |
---- |
---- |
---- |
219*6 |
31.52 |
219*5 |
31.52 |
DN250 |
---- |
---- |
---- |
---- |
273*8 |
52.28 |
273*7 |
45.92 |
DN300 |
---- |
---- |
---- |
---- |
325*8 |
62.54 |
325*7 |
54.9 |
DN600 |
---- |
---- |
---- |
---- |
630*9 |
137.82 |
630*7 |
107.5 |
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