Longitudinal weled pipe

 longitudinal welded pipes are a practical, cost-efficient solution for a wide range of industrial, structural, and utility applications, valued for their simplicity in manufacturing and consistent performance under moderate conditions.

1. Product Definition

Longitudinal Welded Pipe features a straight seam parallel to the pipe axis, categorized into:

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  LSAW (Longitudinal Submerged Arc Welded):

  Formed by bending steel plates with SAW welding, ideal for high-pressure pipelines (OD: 355.6–2320mm, WT: 4.8–50mm)

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  ERW (Electric Resistance Welded):

  High-frequency welded strips for precision tubing (OD ≤24", WT ≤12mm), cost-effective for mass production

2. Key Applications

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  Energy Sector:

  LSAW pipes in oil/gas transmission (e.g., X70 steel for 10 MPa service)

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  Construction:

  LSAW for piling (ASTM A252); ERW square tubes for structural frames

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  Industrial Fluids:

  ERW pipes in water supply networks (galvanized surface, ≤4.8 MPa)

3. Performance & Compliance

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  Standards: API 5L PSL2 (SSC testing), ASTM A53 (ERW mechanical properties)

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  QA Tests: Hydrostatic pressure, UT/RT weld inspection, and flattening tests