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  • Straight Seam Welded Steel Pipe /Welded pipe / Astm Lsaw Steel Pipe
  • Straight Seam Welded Steel Pipe /Welded pipe / Astm Lsaw Steel Pipe
  • Straight Seam Welded Steel Pipe /Welded pipe / Astm Lsaw Steel Pipe
  • Straight Seam Welded Steel Pipe /Welded pipe / Astm Lsaw Steel Pipe
  • Straight Seam Welded Steel Pipe /Welded pipe / Astm Lsaw Steel Pipe
  • Straight Seam Welded Steel Pipe /Welded pipe / Astm Lsaw Steel Pipe

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Straight Seam Welded Steel Pipe /Welded pipe / Astm Lsaw Steel Pipe
Straight seam pipe is a type of steel pipe, whose weld seams are distributed in a straight line along the length of the steel pipe. It is made by rolling and welding steel plates or steel strips.
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Material Classification- Low Carbon Steel (Q195, Q215, Q235, Q275): Carbon content ≤0.25%, excellent weldability.
- Medium Carbon Steel (Q345, Q390): Carbon content 0.25%-0.6%, higher strength.
- High Carbon Steel (rarely used for straight seam pipes).
Nominal Diameter (DN)- DN15 (1/2") ~ DN1200 (48"), some SAW pipes up to DN2000+.
- Outer Diameter (mm): e.g., DN100 → 114.3mm, DN200 → 219.1mm (refer to GB/T 3091).
Wall Thickness (mm)- Standard Range: 2~40mm, adjusted by pressure class:
- Low-pressure pipes: 2~8mm.
- Medium/high-pressure pipes: 8~20mm.
- SAW pipes: 10~40mm.
Length (m)- Fixed lengths: 6m, 9m, 12m (customizable).
Nominal Pressure (PN)- Low Pressure: PN ≤1.6MPa (e.g., Q235B, wall thickness 4mm, DN100 → ~1.0MPa).
- Medium Pressure: PN = 2.5~10MPa (e.g., Q345B, wall thickness 10mm, DN200 → ~4.0MPa).
- High Pressure (SAW): PN ≥10MPa (calculated per API Spec 5L).
Mechanical Properties


Standards- Domestic:
- GB/T 3091 (Low-pressure fluid transport pipes).
- GB/T 9711 (Oil & gas pipelines).
- GB/T 13793 (ERW pipes).
- International:
- API Spec 5L (Oil & gas, PSL1/PSL2 grades).
- EN 10217 (European standard).


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