Spiral-Welded Steel Pipes
Large-Diameter Pipe Solutions for Infrastructure & Transmission
Spiral-welded steel pipes are manufactured with a helical weld seam and are widely used in large-diameter transmission and infrastructure applications. ROSHA STEEL supports international steel slab sourcing through specification-based procurement, supplier coordination and international trade arrangements. For pipeline procurement, material grade, Product Specification Level (PSL), dimensional requirements, weld quality, testing and coating specifications must be clearly defined. Steel Grades & Mechanical Properties Selected API 5L Grade Designations
| Grade | Metric Designation |
|---|---|
| Grade B | L245 |
| X42 | L290 |
| X52 | L360 |
The numerical designations identify nominal grade strength levels. Actual minimum and maximum mechanical-property requirements depend on the applicable API 5L edition, PSL, manufacturing route and delivery condition. Chemical Composition & Technical Analysis Chemical composition must be evaluated for the selected API 5L grade and PSL.
| Parameter | Technical Requirement |
|---|---|
| Carbon (C) | Grade- and PSL-specific limit |
| Manganese (Mn) | Grade- and PSL-specific limit |
| Phosphorus (P) | Applicable maximum |
| Sulfur (S) | Applicable maximum |
| Carbon Equivalent | Where required |
| Additional Alloying Elements | According to selected specification |
| Yield & Tensile Strength | Grade- and PSL-specific |
| Impact Toughness | Where required |
Reference Standard:
API Specification 5L — applicable contractual edition. Dimensions & Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturing Method | Helical / Spiral Welding |
| Steel Grade | As specified |
| Product Specification Level | PSL 1 or PSL 2 |
| Outside Diameter | As specified |
| Wall Thickness | As specified |
| Pipe Length | As agreed |
| Weld Inspection | According to applicable standard |
| Hydrostatic Testing | As required |
| External Coating | As specified |
| Internal Lining | Where required |
Quality & Weld Inspection
Depending on the applicable specification, inspection may include chemical analysis, mechanical testing, nondestructive examination of welds, hydrostatic testing, dimensional verification, coating inspection and material traceability.
Applications
• Water Transmission Pipelines • Oil and Gas Transmission, Where Appropriately Specified • Industrial Pipeline Networks • Large-Diameter Infrastructure Systems
Request a Technical Offer
Specify the API 5L edition, grade, PSL, outside diameter, wall thickness, length, quantity, coating requirements, inspection documentation and destination.