Spiral Submerged Arc Welded Pipe SSAW Product Overview
Spiral Submerged Arc Welded (SSAW) pipes are cold-formed steel tubes manufactured by helically welding hot-rolled steel strips at 60–85° forming angles. Designed for high-pressure fluid transmission, these pipes achieve API 5L X70-grade tensile strength (570 MPa) with ±0.75% OD tolerance and ±10% wall thickness consistency. Ideal for oil/gas pipelines, piling, and water supply systems, SSAW pipes offer 30% lower installation costs vs. seamless alternatives while meeting ISO 3183, ASTM A252, and EN 10219 standards.
Technical Specifications
1. Dimensions & Materials
| Parameter | Specifications | |
|---|---|---|
| Outer Diameter (OD) | 219.1–3,580 mm (±0.75% tolerance) | Wall Thickness: 3.2–25.4 mm (±10%) |
| Length | 5.8–12.5 m (custom up to 18m) | Spiral Weld Angle: 50–75° |
| Steel Grades | API 5L (X42–X80), ASTM A53 (A/B), EN 10217 (P235–P265), GB/T 9711 (L245–L555) | |
| Coil Width | 0.8–2.2 m (hot-rolled SAE 1006–1045 steel) | Forming Speed: 8–25 m/min |
2. Welding & Testing
- Welding Process: Dual-tandem submerged arc welding (SAW) with ER70S-6 wire (AWS A5.17).
- Weld Reinforcement: ≤3mm height | Weld Offset: ≤1.5mm (API 5L).
- Non-Destructive Testing (NDT): 100% ultrasonic (UT), X-ray (RT), and hydrostatic testing (30MPa).
Chemical Composition & Mechanical Properties
1. API 5L PSL2 Grades (Typical Analysis)
| Grade | C | Mn | Si | P≤ | S≤ | YS (MPa) | TS (MPa) | CEₚcm |
|---|---|---|---|---|---|---|---|---|
| X42 | 0.22% | 1.30% | 0.45% | 0.025% | 0.015% | 290 | 415 | 0.20 |
| X70 | 0.12% | 1.70% | 0.45% | 0.025% | 0.015% | 570 | 670 | 0.23 |
2. Key Performance Metrics
- Impact Toughness: ≥80J at -20°C (ISO 148-1 Charpy V-notch).
- Hardness: ≤248 HV10 (ISO 6507) for sour service (NACE MR0175).
- Dimensional Tolerance: OD ±0.75%, wall ±10%, straightness ≤0.2% of length.
Manufacturing Advantages
- Spiral Weld Design: Distributes stress evenly, enhancing burst pressure resistance (30% > LSAW).
- Cost Efficiency: 20–30% material savings vs. longitudinal welded pipes.
- Customization: Adjustable OD/wall ratios (10:1 to 100:1) for geotechnical piling.
- Corrosion Protection: Optional 3LPE/3LPP coating (2–3mm) for offshore pipelines.
Applications
| Industry | Use Case | Recommended Grade |
|---|---|---|
| Oil & Gas | Cross-country transmission lines | API 5L X65/X70 (PSL2) |
| Civil Engineering | Foundation piling | ASTM A252 Gr.3 (455 MPa TS) |
| Water Supply | Municipal water mains | EN 10219 S355J2H (470 MPa) |
| Structural | Bridge supports, industrial racks | GB/T 3091 Q345B (470 MPa) |
Certifications & Compliance
- API 5L: PSL1/PSL2 for sour gas service (H₂S ≤15psi).
- ISO 9001: Quality management system.
- DNV GL-ST-F101: Offshore pipeline standards.
- AS/NZS 2280: Ductility testing for seismic zones.
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Luo Kaiwei Steel Company is a comprehensive steel supplier that produces a variety of carbon steel plates, carbon steel pipes, galvanized steel, carbon steel coils, and steel profiles.
