Description
Factory-direct SSAW spiral welded steel pipe supply — OD 159–3200mm produced on three dedicated lines with in-house physical and chemical lab verification per API 5L.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235/Q345 SSAW Spiral Welded Steel Pipe |
| Product Type | SSAW Spiral Welded Steel Pipe (Round) |
| Steel Grade | Q195, Q235, Q345B, A53, A106, 1.0033, 08F, X42–X80, L175–L555, L245NB |
| Standard | API 5L, API 5CT, SY/T 5037, SY/T 5040, GB/T 9711.1, GB/T 9711.2, ASTM A53, ASTM A106 |
| Section Shape | Round |
| Size Range | OD 159 mm – 3200 mm |
| Wall Thickness | 3 mm – 30 mm |
| Length | 5.8 m – 11.8 m (or as required) |
| Technique | SAW (Submerged Arc Welding) / Spiral Welded |
| Surface Treatment | Bare, Painted, Anti-corrosion coating, FBE, 2PE, 3PE, 3PP |
| Ends | Plain end, Beveled end, PVC covered |
| Tolerance | ±1% (OD), ±10% (general) |
| Invoicing | By Theoretical Weight |
| Application | Piling, heat-supply, water conveyance, oil & gas pipelines, chemical industry, power engineering, coal gas transport, mine slurry transport |
| MOQ | 25 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Piling foundations, water conveyance trunk lines, district heating networks |
| Oil & Gas | API 5L certified transmission pipelines for petroleum and natural gas |
| Power Engineering | Circulating water pipes, cooling systems, flue gas ducts |
| Municipal Infrastructure | Drainage networks, coal gas distribution, industrial slurry transport |
| Chemical Industry | Process fluid conveyance, corrosion-resistant coated pipelines |
Where Spiral Weld Geometry Reduces Pressure Risk on Large-Diameter Pipes
The spiral seam distributes hoop stress 75%–90% lower than a straight weld line, allowing thicker walls at lower weight.
Global buyers sourcing large-diameter pipes for critical infrastructure often encounter quality uncertainty — inconsistent wall thickness, unclear steel grade traceability, and missing mill test certificates that cause customs delays or project compliance failures. Fragmented sourcing from multiple suppliers for pipes, coatings, and fittings adds coordination costs and delivery risks. When a DN400+ spiral pipe arrives at a piling site with ovality exceeding tolerance, the entire batch faces rejection or costly rework. [NEED_CITE: API 5L spiral welded pipe manufacturing requirements]
How Large-Diameter SSAW Pipe Matches Piling and Water Conveyance Projects
Piling applications demand pipes with OD up to 3200mm and wall thickness reaching 30mm — dimensions that straight seam or ERW processes cannot economically produce. The SSAW spiral welded steel pipe achieves these sizes through continuous helical forming, with the spiral weld orientation reducing stress concentration compared to longitudinal seams. For water conveyance projects requiring 3PE or FBE coating, the bare pipe surface undergoes shot blasting to Sa2.5 before coating application, ensuring adhesion that survives burial and hydrostatic pressure. Our in-house lab conducts drop-weight tear tests and holiday detection on every coated batch before shipment.
Engineering Compliance and Certification Requirements
Large-diameter spiral pipes for oil & gas transmission must conform to API 5L PSL1 or PSL2, with chemical composition and mechanical properties verified per heat number. European projects require CE marking under EN 10210/EN 10219, while North American infrastructure specifies ASTM A53 or A106 compliance. Surface treatment selection depends on service environment: FBE coating suits buried pipelines up to 80°C, 3PE provides mechanical protection for rocky soil conditions, and 3PP handles higher operating temperatures. Third-party inspection through SGS or BV confirms coating thickness, adhesion strength, and holiday-free coverage before container loading. [NEED_CITE: EN 10210 hot-finished structural hollow section requirements]
Steel Grade Selection and Spiral Welding Process
The Q-series grades (Q195, Q235, Q345B) follow Chinese GB standards, with yield strength increasing from 195 MPa to 345 MPa — suitable for low-pressure water conveyance and structural piling. API X42–X80 grades serve high-pressure oil & gas pipelines, where the spiral weld seam’s helical orientation distributes stress more evenly than straight seam alternatives. Submerged arc welding (SAW) uses flux-covered wire under a granular flux blanket, producing deep penetration and smooth weld profiles that pass ultrasonic inspection. For corrosive environments, 3PE coating combines epoxy primer, adhesive copolymer, and polyethylene outer layer — the epoxy bonds chemically to blast-cleaned steel while polyethylene resists soil stress and moisture ingress.
Hidden Costs of Wrong Steel Grade or Missing Certification
Specifying Q235 when project drawings require API 5L X52 means the pipe fails chemical composition checks during third-party inspection — the entire shipment faces rejection or costly downgrading. Missing CE certificates for European projects trigger customs holds, delaying site delivery and triggering liquidated damages clauses. Negative tolerance exceeding contractual limits reduces actual wall thickness below design requirements, creating structural safety concerns that surface only during hydrostatic testing. Material traceability gaps — no heat number marking or incomplete mill test certificates — prevent compliance verification and void project insurance coverage. [NEED_CITE: steel grade equivalence between API 5L and ASTM standards]
Why Project Procurement Teams Choose Our SSAW Pipe Supply
Three dedicated production lines cover OD 159–3200mm with wall thickness up to 30mm, eliminating the need to source large-diameter pipes from multiple suppliers. In-house physical and chemical laboratories conduct incoming material inspection, in-process weld examination, and final dimensional verification — original mill test certificates issue per heat number, not per order. Factory-direct pricing removes trading company margins, while 41 patented technologies include proprietary processes for sharp-corner rectangular tubes that fill global specification gaps. CE certification (EN 10210/10219), ISO 9001:2015 quality management, and third-party verification through SGS and BV ensure customs clearance across 50+ countries. Professional loading plans optimize container utilization for 5.8m–11.8m lengths, with real-time tracking from Jinan port to destination.
Documentation & Compliance
- Mill test certificate documenting Q345B chemical composition and yield strength per GB/T 9711, with heat number traceability
- CE certificate confirming EN 10210/EN 10219 compliance for European market customs clearance
- ISO 9001:2015 quality management certificate covering production and inspection processes
- SGS or BV third-party inspection report verifying coating thickness, adhesion, and holiday detection results
- Material traceability documentation linking each pipe to specific heat number and production batch
- Complete customs documents including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Bare SSAW spiral welded steel pipes bundled with steel strips, ends protected by plastic caps to prevent damage during ocean transit
- 3PE/FBE coated pipes wrapped with protective film and edge protectors to preserve coating integrity during handling and shipping
- Container loading optimized for 5.8m–11.8m lengths, with wooden cradles preventing contact between coated surfaces
- Heat number and steel grade marked on each pipe with stenciled paint, matching mill test certificate documentation
- FOB/CIF/DDP delivery terms available, with professional logistics coordination from Jinan port to 50+ countries
- Custom cutting to project-specified lengths available, reducing on-site waste and secondary processing costs
Start Your SSAW Spiral Welded Steel Pipe Inquiry
Submit your specifications including OD, wall thickness, steel grade, quantity, surface treatment requirement, and destination port — receive detailed quotation with unit price, delivery timeline, and applicable certification documentation within 12 hours. Request original mill test certificates and third-party inspection reports before contract signing to verify material compliance. Confirm loading plans and shipping schedule to align with your project timeline.
Get Your SSAW Spiral Welded Steel Pipe Quote
Send specifications via email or WhatsApp to receive pricing and mill test certificates.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
