A straight seam pipe is a welded steel pipe with a seam running in the same direction as the pipe length. Steel plate or strip is formed into a round shape, then the two edges are welded together. This pipe is used for low pressure fluid lines, structural columns, building pipe work, and oil or gas projects when the selected standard and test level match the job.
The production route of a straight seam pipe is simple to arrange for many regular sizes. High-frequency welding is often used for smaller and medium pipes, while submerged arc welding is used for larger diameter pipe. The weld line can be inspected, trimmed, and tested before delivery. This product can also be coated, beveled, expanded, or cut to fixed length. For site use, the buyer should check diameter, wall thickness, steel grade, weld surface, and end preparation. When those details are clear, this product fits many water, construction, and general steel pipe projects.
Product Parameters
|
Parameter |
Value |
|
Material |
Q195, Q215A, Q235A, or project steel grade |
|
Process |
High-frequency straight seam welding or submerged arc welding |
|
Length |
Usually 4-10 m, fixed or multiple length available |
|
Standard examples |
GB/T3091-2008, GB/T9711.1-1997, API 5L when required |
|
Surface |
Black, painted, galvanized, or anti-corrosion coating |
|
End type |
Plain, beveled, threaded, or flanged |
|
Inspection |
Weld check, dimension check, hydrostatic or NDT test as needed |
|
Use range |
Water supply, petrochemical line, structure, machinery pipe |
Manufacturing Process
1. For straight seam pipe, steel strip or plate is formed into a pipe shape.
2. The joint edge is welded by high-frequency current or submerged arc welding.
3. The pipe is sized, cut, inspected, and treated on the surface when needed.
Use Cases
1. Low pressure water and air pipe lines.
2. Building columns, frames, and general steel structures.
3. Petrochemical and natural gas pipe sections under matched standards.
Packing and Delivery Notes
1. Bundle marks should show size, grade, length, and quantity.
2. End protectors or bevel protection can be added for long-distance delivery.
3. Surface coating should be checked before loading if the pipe will be stored outside.
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