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Products & Solutions
Spiral Submerged Arc Welded Pipe
Spiral Submerged Arc Welded Pipe
Spiral Submerged Arc Welded Pipe (SSAW Pipe)
1) Overview
Spiral Submerged Arc Welded (SSAW) pipes are produced by forming hot rolled coils into a spiral shape and welding with double-sided submerged arc welding.
They feature large diameter range, uniform wall thickness, high weld quality, and high material utilization, making them ideal for oil & gas pipelines, water transmission, piling, and structural applications.
2) Manufacturing Process
• Raw material: hot rolled coil/strip
• Forming: spiral forming, edge alignment
• Welding: inner & outer submerged arc welding (double weld)
• Weld inspection: 100% UT / X-ray
• Post-treatment: expanding, sizing, straightening, hydro test, anti-corrosion coating
3) Key Features
• Large diameter capability: up to 4000 mm
• Thick wall production: up to 25.4 mm
• High strength steel: up to API 5L X80 grade
• Reliable weld seam: dense welds with properties close to base metal
• Cost-effective: ideal for large-diameter, long-distance pipelines
4) Standards
• API 5L: line pipe for oil & gas (PSL1/PSL2)
• ASTM A252: piling pipe
• ASTM A139: electric-fusion arc-welded steel pipe
• EN 10219 / EN 10224: structural & fluid conveying welded pipes
• GB/T 9711: pipeline steel pipe for oil & gas
• SY/T 5037: SSAW pipes for medium/low pressure fluids
5) Grades
• Carbon steel: Q235, Q345, L245, L290, L360
• Line pipe steel: API 5L Gr.B, X42–X80
• Customized grades: available upon project request
6) Applications
• Oil & gas: long-distance transmission pipelines
• Municipal water: water supply & sewage networks
• Structural: piling pipes, building columns
• Power plants: circulating water systems
• Marine engineering: subsea pipelines, port piles
• Industrial: metallurgy, chemical, thermal pipelines
7) Quality & Testing
• Chemical & mechanical tests (C, S, P control, tensile, impact, hardness)
• Weld inspection: UT & RT 100%
• Hydrostatic test: 100% on each pipe
• Dimensional check: roundness, straightness, bevel accuracy
• Coating inspection: epoxy, 3PE, FBE, asphalt
• Third-party inspection: SGS, BV, LR, DNV
8) Supply & Packaging
• Size range: OD 219 – 4000 mm, WT 5 – 25.4 mm, length 6 – 18 m
• Ends: plain, beveled, flanged
• Coating: bare, varnish, asphalt, 3PE, FBE
• Packaging: loose or bundled, suitable for land/sea transport
• Traceability: MTC (EN 10204 3.1/3.2)
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