Spiral Welded Steel Pipe (SSAW) Carbon Steel — Factory Direct Supplier | Huaxia-Steel
Spiral welded steel pipe (SSAW — spiral submerged arc welded) is the economical choice for large-diameter pipelines: hot-rolled steel coil is helically formed and welded continuously, allowing one coil width to produce any diameter from 219 mm to 3,000 mm without dedicated dies. Huaxia-Steel supplies SSAW pipe to API 5L, ASTM A252, EN 10219, and GB/T 9711 for water transmission, piling, structural, and oil & gas applications, with hydrostatic testing and full documentation on every order.
Product Overview
In the SSAW process, coil strip is uncoiled, leveled, and formed at an angle into a spiral; both the inside and outside seams are welded in one pass by submerged arc welding under flux. Because forming angle and coil width can be adjusted, diameter changes are fast and cheap — ideal for large diameters (above 500 mm) where longitudinal (LSAW) pipe is significantly more expensive. The spiral weld distributes stress over a longer path, and modern double-sided welding with 100% seam NDE delivers quality suitable for pressure pipelines and deep-water piling alike.
Specifications
| Parameter | Standard / Range |
|---|---|
| OD Range | 219 – 3,000 mm (8″ – 120″) |
| Wall Thickness | 4 – 25.4 mm |
| Length | 6 – 12 m standard; custom lengths on request |
| Steel Grades | API 5L Gr.B – X70; ASTM A252 Gr.2/3; EN S235/S355; GB Q235/Q355 |
| Weld Type | Double-sided submerged arc weld (inside + outside seam) |
| Ends | Plain, beveled (30°+30° per API), flanged, or with coupling |
| Testing Pressure | Hydrostatic per standard (API 5L or as specified) |
| Coating Options | 3LPE, 3LPP, FBE, cement mortar lining, coal tar epoxy, bare varnish |
Dimensions and Weight (Selected Sizes)
| OD (mm) | Wall (mm) | Theoretical Weight (kg/m) |
|---|---|---|
| 219 | 6 | 31.5 |
| 323.9 | 8 | 62.3 |
| 508 | 10 | 122.8 |
| 820 | 12 | 239.1 |
| 1220 | 14 | 416.7 |
| 1820 | 16 | 712.7 |
Manufacturing Standards
- API 5L PSL1/PSL2 — Line Pipe (up to X70 for SSAW)
- ASTM A252 — Welded and Seamless Steel Pipe Piles
- EN 10219 — Cold Formed Welded Structural Hollow Sections
- GB/T 9711 — Petroleum and Natural Gas Industry Line Pipe
- AWWA C200 — Steel Water Pipe for water transmission projects
Applications
- Municipal water transmission and drainage mains
- Steel pipe piles for bridges, wharves, and foundations
- Oil and gas gathering lines (PSL2 up to X60–X70 typical for SSAW)
- Structural columns and caissons for construction
- Slurry pipelines and outfall/dredging lines
Quality Assurance
Every joint is hydrostatically tested to the standard’s pressure and held for the specified time. Weld seams receive 100% ultrasonic or X-ray examination (automatic UT on-line plus radiographic sampling at weld ends). Tensile, Charpy impact, and DWTT testing are performed per API 5L PSL2 when ordered. Dimensional checks cover ovality, bevel angle, and misalignment at the weld. Third-party inspection (SGS, BV, Applus) is welcome, and API 5L PSL2 orders ship with full PSL2 documentation packages including weld maps and NDE reports.
Packing and Shipping
Small diameters ship in hexagonal bundles; large diameters ship loose in nested loads or bulk, with bevel protectors and nylon slings instead of steel bands on coated pipe. Coated pipe (3LPE/FBE) is packed with spacers to prevent coating damage; lined pipe gets end caps and internal support saddles for long shipments. Weight calculations, loading plans, and stowage drawings are provided for project logistics coordination.
Request SSAW Pipe Pricing
Tell us diameter, wall, grade, coating, and quantity — we quote factory-direct with hydrotest and NDE documentation included. Large-diameter project orders welcome.
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