Description
Factory-direct SSAW spiral steel pipe — All Q235 through API X70 grades in OD 10–1000mm produced on our own lines with in-house lab verification per heat.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 SSAW Spiral Steel Pipe |
| Product Type | SSAW Spiral Steel Pipe |
| Steel Grade | Q235, Grade B, X42, X52, X60, X70, L245, L290, L320, L360, L390, L415 |
| Standard | ASTM, GB/T 3091-2001, GB/T 13912-2002, BS 1387, ASTM F1083 |
| Section Shape | Round |
| Size Range | OD 10–1000 mm |
| Wall Thickness | 1–80 mm |
| Length | 6–12 m (or Customized) |
| Technique | SSAW (Spiral Submerged Arc Welded) |
| Surface Treatment | Black Painting / Hot Rolled |
| Application | Drainage and sewage systems, fluid transport (water, gas), construction pipe, structural pipe, liquid delivery |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Municipal drainage trunk lines, sewage interceptor pipelines, stormwater conveyance networks |
| Construction Companies | Industrial plant liquid delivery systems, foundation dewatering discharge pipes |
| Infrastructure Developers | Wastewater treatment plant inlet/outlet manifolds, sludge transport lines |
| Steel Distributors | Stocking OD 200–800mm SSAW pipes for regional drainage project supply |
Where Wall-Thickness Tolerance Decides Whether a Drainage Shipment Clears Third-Party Inspection
A 0.3mm negative deviation on a 12mm-wall OD 600mm SSAW pipe can fail a client’s ultrasonic re-check and strand the entire container at the destination port.
I watched a full-truck-load of large-diameter spiral pipes get held at Jebel Ali because the wall thickness fell below the minimum allowed by the project spec — the mill certificates looked fine on paper, but the actual ultrasonic readings told a different story. For drainage and sewage projects where pipes are buried under roads or run beneath river crossings, specifiers call out tight tolerance bands and require third-party re-inspection on arrival. Sourcing from a trader who cannot show you the actual ultrasonic and dimensional reports before shipment is how procurement teams end up paying for re-rolling, air-freighting replacement sections, or renegotiating with the client. A Q235 SSAW spiral steel pipe supplier who runs every heat through an in-house physical and chemical lab before release removes that uncertainty at the source. [NEED_CITE: ultrasonic thickness testing requirements for submerged arc welded steel pipes]
Matching OD and Wall Thickness to Buried Drainage Load Conditions
Municipal drainage networks route SSAW pipes under traffic-bearing roads, railway embankments, and sometimes river beds — each scenario changes the external load the pipe wall must resist. For shallow-buried segments under light traffic, Q235 grade at standard wall thickness handles the soil and live loads; for deeper trenches or crossing points, stepping up to L360 or L415 with thicker walls gives the ring stiffness the design calls for. Our production lines cover OD 10–1000mm and wall thickness up to 80mm in a single Q235 SSAW spiral steel pipe order, so the trunk line, branch lines, and crossing sections can all ship from one mill certificate series — no mixing heat numbers across suppliers.
Structural Codes, Corrosion Environment, and Certification Path
Buried sewage pipes operate in wet, sometimes sulfate-rich soils that attack unprotected steel surfaces over decades. The hot-rolled or black-painted finish we ship as standard handles short-term construction dewatering and temporary discharge lines; for permanent municipal networks, specifiers typically call for 3PE coating or epoxy lining, which we arrange as a secondary process. On the compliance side, projects funded by European development banks require CE marking under EN 10210 or EN 10219, while Gulf region tenders often reference ASTM standards alongside SGS or BV third-party inspection. [NEED_CITE: EN 10219 cold-formed and hot-formed hollow section requirements for structural applications] Cutting the pipes to site-specific lengths at our facility before shipment reduces field welding and speeds up the laying crew’s progress.
Reading the Steel Grade Table: Q235, Grade B, and the API Pipeline Series
Q235 is the workhorse carbon structural grade in Chinese standard GB/T 700, widely specified for non-pressure drainage and general structural applications where high yield strength is not the governing design factor. Grade B, from the ASTM A283 family, serves a similar role in North American spec sheets. Once the project moves into pressurized fluid transport — raw water mains, gas distribution, or industrial process lines — the specification typically shifts to API 5L pipeline grades such as X42, X52, X60, or X70, where the number indicates the minimum yield strength in ksi. The L-series designations (L245 through L415) are the ISO 3183 metric equivalents of the same API grades. SSAW technology suits this range because the spiral weld seam distributes longitudinal stress more evenly than a straight seam, making it the preferred process for large-diameter, thin-to-medium wall pipes used in long-distance conveyance. [NEED_CITE: API 5L steel grade designation system and yield strength classes]
The Real Cost of Accepting a Mill Certificate You Cannot Verify
Buying SSAW pipe on price alone, without insisting on heat-number traceability and a verifiable mill test certificate, transfers risk directly to the project budget. A pipe that fails chemical composition limits at the client’s independent lab means the entire batch must be rejected — and replacement lead times of several weeks can push a drainage project past its rainy-season deadline. Missing or mismatched certification documents cause customs holds at the destination port, generating demurrage charges that routinely exceed the original freight cost. [NEED_CITE: third-party inspection requirements for imported welded steel pipes in GCC countries]
Why Project Procurement Teams Specify a Q235 SSAW Spiral Steel Pipe Supplier With In-House Testing
Every heat of Q235, Grade B, or API-grade pipe we produce is tested in our own physical and chemical laboratory before it leaves the mill — tensile strength, yield point, elongation, chemical composition, and weld seam ultrasonic inspection all recorded against the heat number. Our three dedicated SSAW lines cover the full OD 10–1000mm and wall thickness 1–80mm range, so a drainage contractor ordering trunk-line and branch-line diameters in one contract receives matched material from a single quality system. We hold ISO 9001:2015 certification, CE marking under EN 10210/EN 10219 for European tenders, and Singapore FPC certification for Southeast Asian infrastructure projects, with SGS and BV inspection reports available for any shipment. As a factory-direct supplier, the price you see is the mill price — no trading markup, no specification confusion from a middleman who has never seen the production line.
Documentation & Compliance
- Mill test certificate documenting Q235, Grade B, or X42–X70 chemical composition and mechanical properties per heat number, issued against GB/T 3091-2001 or ASTM standards
- CE certificate under EN 10210 / EN 10219 for shipments entering EU member states and markets referencing European hollow section standards
- ISO 9001:2015 quality management system certificate covering the full SSAW production and inspection process
- SGS or BV third-party inspection report confirming dimensional tolerance, weld seam quality, and coating thickness where specified
- Full material traceability from slab heat number through to finished pipe, recorded on every mill test certificate
- Customs document package including packing list, bill of lading, and certificate of origin formatted for the destination port
Packaging, Loading & Delivery
- Black-painted Q235 SSAW pipes bundled with steel strips and padded at contact points to prevent coating damage during ocean transit
- OD 600–1000mm large-diameter pipes loaded in dedicated containers with internal bracing to prevent ovalization under stacking loads
- 6m and 12m standard lengths nested to maximize 40ft open-top or flat-rack container utilization, reducing per-ton freight cost
- Custom cut lengths marked with heat number, steel grade, and OD × wall thickness at both ends for site identification
- FOB, CIF, and DDP shipping terms available, with professional loading plans prepared for each destination port’s crane and yard capacity
Start Your SSAW Pipe Inquiry With Specifications, Not Just a Drawing
Send us the OD, wall thickness, steel grade, total tonnage, and destination port for your drainage or fluid transport project, and we return a detailed quotation including unit price, production lead time, applicable certifications, and a sample mill test certificate within one working day. For non-standard dimensions outside the 10–1000mm OD range, our engineering team reviews the drawing and confirms feasibility and MOQ before you commit.
Request a Quotation and Mill Test Certificate Today
Submit your Q235 SSAW spiral steel pipe specifications by email or WhatsApp to receive factory-direct pricing, available certification options, and a confirmed delivery schedule.
Email: admin@sdxjysteel.com
WhatsApp / Mobile: +86 188 5315 7756
