Description
Factory-Direct SSAW Spiral Steel Pipe — Produced in our own mill with 2,800+ specifications in stock, eliminating third-party material gaps for drainage and sewage projects.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | SSAW Spiral Steel Pipe |
| Product Type | SSAW Spiral Welded Steel Pipe |
| Steel Grade | Q235, Grade B, X42, X52, X60, X70, L245, L290, L360, L390, L415 |
| Standard | ASTM, GB/T 3091-2001, GB/T 13912-2002, BS 1387, ASTM F1083 |
| Section Shape | Round |
| Size Range | Outer Diameter 10–1000 mm |
| Wall Thickness | 1–80 mm |
| Length | 6 m–12 m (or Customized) |
| Technique | SSAW (Submerged Arc Spiral Welded) |
| Surface Treatment | Black Painting / Hot Rolled |
| Ends | Plain / Beveled |
| Application | Drainage and sewage systems, liquid delivery, construction pipe, structural pipe, industrial pipeline |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Municipal Infrastructure | Underground stormwater drainage networks, municipal sewage collection mains, outfall discharge lines |
| Industrial Construction | Factory wastewater conveyance, cooling water circulation pipelines, process drainage systems |
| Civil Engineering | Foundation piling, structural support columns, bridge approach embankment drainage |
| Agricultural & Rural | Irrigation canal linings, farmland drainage ditches, rural sewage treatment plant piping |
What Wall-Thickness Tolerance Costs on a Drainage Pipeline Order
Negative tolerance beyond specification triggers third-party rejection at the destination port.
Procurement teams sourcing SSAW spiral steel pipe for drainage and sewage systems often discover dimensional deviations only after the container arrives. A wall thickness that drifts below the specified minimum means the pipe fails hydrostatic or ultrasonic inspection on site. The entire batch gets held at customs or rejected by the project engineer, and replacement shipments take weeks to organize. Material traceability gaps make it worse — when the fabricator sources coils from a third-party mill, the mill test certificate chain breaks, and the client cannot verify which heat number produced which pipe. [NEED_CITE: material traceability requirements for submerged arc welded pipe in infrastructure projects]
Matching Pipe Dimensions to Gravity-Fed Drainage Networks
Municipal drainage systems rely on gravity flow, which means the pipe must maintain a consistent internal diameter and smooth bore over long runs. Our SSAW spiral steel pipe covers outer diameters from 10 mm to 1000 mm with wall thickness from 1 mm to 80 mm, allowing engineers to select the right pressure class for both shallow gravity sewers and deeper force mains. The submerged arc welding process produces a continuous helical seam that distributes stress evenly along the pipe body, reducing the risk of localized corrosion at the weld line — a common failure point in drainage environments where hydrogen sulfide attacks the pipe interior.
Compliance with Engineering Standards and Site Conditions
Drainage and sewage pipelines operate under varying internal pressures and external soil loads depending on burial depth and traffic conditions. Selecting the correct steel grade — from Q235 for light-duty gravity lines to X70 for pressurized sewage force mains — ensures the pipe meets structural design requirements. [NEED_CITE: steel grade selection criteria for buried pipeline applications per ASTM and API standards] Surface treatment with black painting provides baseline corrosion resistance for buried installations, while beveled ends facilitate field welding continuity. For projects requiring third-party verification, we arrange SGS, BV, or TÜV inspection before shipment, and all documentation conforms to ASTM and GB/T standards referenced in the project specification.
Understanding the SSAW Process and Grade Selection
The submerged arc spiral welding technique forms the pipe from a steel coil that spirals continuously through a forming station, with both internal and external welds applied under a flux blanket. This process allows production of large-diameter pipe from relatively narrow coil widths, making it cost-effective for drainage applications requiring diameters above 500 mm. Steel grades in the L-series (L245 through L415) and X-series (X42 through X70) follow API 5L pipeline specifications, where the number indicates the minimum yield strength in ksi (X-series) or MPa (L-series). Q235, the most commonly specified grade for municipal drainage in China, provides adequate strength for gravity-flow systems at lower material cost. Wall thickness tolerance directly affects the theoretical weight per meter — a pipe ordered at 8 mm nominal but delivered at 7.2 mm actual carries less structural capacity than the design assumes. [NEED_CITE: impact of wall thickness tolerance on structural capacity of welded steel pipe]
Hidden Costs of Procuring Without Verified Certification
Purchasing SSAW spiral steel pipe for drainage and sewage systems from a supplier who cannot provide heat-number traceability creates downstream risk. If the mill test certificate does not match the physical pipes delivered, the project inspector will reject the batch. Re-mobilizing a replacement order means paying for new material, new shipping, and project delay penalties. In some cases, pipes with insufficient wall thickness pass visual inspection but fail under hydrostatic test pressure, creating a safety hazard in pressurized sewage applications. [NEED_CITE: quality documentation requirements for steel pipe in municipal infrastructure procurement]
Why Project Teams Source SSAW Pipe From Our Facility
Our facility integrates raw steel production with pipe fabrication under one roof, meaning every coil that enters the forming station carries a verified heat number linked to our in-house laboratory test results. We maintain over 2,800 specifications in stock, so urgent drainage project orders can ship without waiting for coil procurement. Our quality management system is ISO 9001 certified, and we provide complete documentation packages including weld procedure specifications, procedure qualification records, weld maps, and dimensional inspection reports. For international projects, we have supplied SSAW spiral steel pipe to drainage and sewage infrastructure across the Middle East, Southeast Asia, and Africa, with experience navigating customs documentation requirements for each region. Professional loading planning ensures oversized diameter pipes are secured properly in containers and on flat-rack shipments, preventing transit damage to the black painting surface.
Documentation & Compliance
- Mill Test Certificate documenting Q235/X42–X70 chemical composition and mechanical properties per ASTM and GB/T standards, linked to individual heat numbers
- Third-party inspection report from SGS, BV, or TÜV covering dimensional verification, weld seam NDT, and coating thickness measurement
- Weld Procedure Specification (WPS) and Procedure Qualification Record (PQR) for the submerged arc welding process used in SSAW spiral steel pipe production
- Dimensional inspection report confirming outer diameter, wall thickness, and length tolerances against ASTM requirements
- Certificate of Origin and customs documentation (packing list, bill of lading) prepared for destination-country clearance requirements
- ISO 9001 quality management system certificate covering the full production process from coil receiving to finished pipe dispatch
Packaging, Loading & Delivery
- SSAW spiral steel pipe bundled with steel strip ties and edge protectors to preserve the black painting surface during ocean transit and prevent coating damage at contact points
- Pipes sorted by diameter and wall thickness group to optimize container loading, with 6 m and 12 m lengths nested to maximize cubic utilization for 10–500 mm OD ranges
- Heat number and steel grade stenciled on each pipe end, with bundle tags matching the mill test certificate for site identification and traceability verification
- Beveled-end pipes fitted with plastic end caps to protect the bevel angle during handling and transport, ensuring field-welding readiness on arrival
- Oversized diameter pipes (above 500 mm OD) shipped on flat-rack containers or break-bulk vessels with custom cradle supports to prevent ovality deformation
- FOB, CIF, and DDP shipping terms available with professional loading supervision and container sealing to ensure SSAW spiral steel pipe arrives in project-ready condition
Starting Your SSAW Pipe Procurement
Send your project drawings, required steel grade, diameter and wall thickness specification, total quantity, and destination port to receive a detailed quotation including material cost, fabrication, surface treatment, packing, and shipping. Our engineering team reviews the specification within 24 hours and confirms shop drawing requirements before production begins. You will receive the mill test certificate and third-party inspection schedule as part of the contract documentation package.
Request a Quotation with Mill Test Certificate
Submit your SSAW spiral steel pipe specification — including steel grade, outer diameter, wall thickness, length, quantity, and destination — to receive pricing and complete quality documentation.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: How do I choose between Q235, X42, and X70 grades for a drainage project?
A: Q235 suits gravity-flow municipal drainage where internal pressure is minimal and the primary requirement is structural support under soil load. X42 and higher grades are specified for pressurized sewage force mains or deep-burial applications where external soil pressure and internal operating pressure require higher yield strength. The selection depends on the project engineer’s hydraulic design and burial depth calculation.
Q: Can you provide third-party inspection for SSAW spiral steel pipe before shipment?
A: Yes. We arrange SGS, BV, or TÜV inspection at our facility before dispatch. The inspection covers dimensional verification, visual weld examination, non-destructive testing of the spiral seam, and coating thickness measurement. The inspection report is issued as part of the shipping documentation package.
Q: What surface treatment options are available for buried drainage applications?
A: Our standard SSAW spiral steel pipe comes with black painting for baseline corrosion protection. For aggressive soil conditions or high-sulfide sewage environments, additional coating options can be applied. The choice depends on the soil resistivity survey and project specification requirements.
Q: What is the minimum order quantity for custom-length SSAW pipe?
A: The minimum order quantity is 5 tons. Standard stock lengths are 6 m and 12 m. Custom cut lengths can be arranged for larger orders, and we optimize container loading based on your specified lengths to reduce shipping cost per meter.
Q: Do you handle export documentation and customs clearance support?
A: Yes. We prepare the complete export documentation package including commercial invoice, packing list, bill of lading, certificate of origin, and mill test certificate. For destination countries with specific import requirements, we confirm the documentation format in advance to avoid customs delays.
