Description
Factory-direct SSAW pipe, no middlemen — Q235 Q345 spiral welded steel pipe produced on our own lines with in-house lab testing before every shipment.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 Q345 Spiral Welded Steel Pipe |
| Product Type | Spiral Welded Steel Pipe (SSAW) |
| Steel Grade | Q235, Q345, Q355, A36, 1020, 1045, 20#, 45#, 16Mn, SS400, S235JR, ASTM A36, ASTM A53, ASTM A106 |
| Standard | ASTM A53, ASTM A106, ASTM A36, GB/T 3091-2001, GB/T 13912-2002, BS 1387, ASTM F1083, DIN, EN |
| Section Shape | Round |
| Size Range | Outer Diameter 10–1000 mm |
| Wall Thickness | 0.25–100 mm |
| Length | 1–12 m (6 m / 6.4 m / 12 m standard) |
| Technique | Hot Rolled / Cold Rolled / Cold Drawn; Spiral Welded |
| Surface Treatment | Painted / Galvanized / Oiled |
| Tolerance | ±1% |
| Ends | Plain / Beveled |
| Application | Fluid transport / Structural pipe / Boiler pipe / Hydraulic pipe / Machinery parts / Curtain wall |
| MOQ | 5 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Water and gas transmission pipelines, piling for bridge foundations, industrial plant pipe racks |
| Construction Companies | Structural columns, scaffolding uprights, retaining wall piling, high-rise building frames |
| Machinery Manufacturers | Hydraulic cylinder barrels, conveyor roller tubes, equipment support frames |
| Infrastructure Developers | Drainage culverts, fence post foundations, greenhouse structural framing |
What Wall-Thickness Tolerance Costs on a Spiral Welded Steel Pipe Order
A ±1% tolerance on a 1000 mm OD SSAW pipe means the difference between passing ultrasonic inspection and failing it on site.
I have seen entire shipments held at port because wall thickness drifted beyond acceptable limits. When a buyer orders Q345 SSAW pipe for a piling project and the actual wall comes in 3% under spec, the structural engineer rejects the lot — not because the steel grade is wrong, but because the load-bearing calculation assumed a specific cross-section. That is where fragmented sourcing becomes expensive: the pipe arrived, the mill certificate looked clean, but nobody ran a real thickness check before loading. With our in-house physical and chemical laboratory, every heat is tested for wall uniformity and chemical composition before the Spiral Welded Steel Pipe Q235 Q345 SSAW Round Pipe leaves the mill. [NEED_CITE: EN 10219 dimensional tolerance requirements for welded hollow sections]
How SSAW Pipe Meets Piling and Fluid Transmission Demands
Spiral welded construction allows large-diameter production that seamless mills cannot reach economically. For EPC contractors running water transmission lines at 800–1000 mm OD, the Spiral Welded Steel Pipe Q235 Q345 SSAW Round Pipe delivers the required bore without the cost premium of JCOE forming. The spiral seam distributes stress along the helix, making it suitable for lower-pressure fluid conveyance and structural piling where axial load matters more than internal pressure. Our 3 dedicated production lines cover over 2,800 specifications, so non-standard OD and wall combinations do not require sourcing from a second supplier.
Structural Compliance and Certification for Project Acceptance
Engineering specifications for piling and structural columns typically reference EN 1993 or AISC frameworks, which demand traceable material properties and certified manufacturing processes. The Spiral Welded Steel Pipe Q235 Q345 SSAW Round Pipe we supply carries CE certification under EN 10210 and EN 10219, meaning EU-market projects clear customs without document disputes. For North American destinations, ASTM A53 and A36 compliance is documented in every mill test certificate. Wall thickness tolerance of ±1% ensures the pipe meets dimensional requirements in structural design calculations, and our理化 lab verifies each heat against the specified grade before release. [NEED_CITE: ASTM A53 dimensional and mechanical requirements for welded pipe]
Steel Grade Selection: Q235, Q345, and International Equivalents
Q235 and Q345 follow the Chinese GB standard system, where the number indicates minimum yield strength in MPa. Q345 (now designated Q355 under updated standards) offers higher yield strength for structural applications requiring greater load capacity. For international projects, these grades cross-reference to S235JR (EN), A36 (ASTM), and SS400 (JIS) — all covered in our Spiral Welded Steel Pipe Q235 Q345 SSAW Round Pipe inventory. The spiral welding process uses submerged arc welding, producing a continuous helical seam suitable for diameters from 10 mm to 1000 mm. Wall thickness ranges from 0.25 mm for light structural use to 100 mm for heavy piling, with surface treatments including hot-dip galvanizing for corrosive environments, painted coatings for indoor structural work, or oiled finish for temporary protection during transit.
Hidden Costs of Unverified Spiral Welded Pipe Procurement
Ordering SSAW pipe without independent thickness verification creates risk across the entire project timeline. Material that fails to match the specified grade — say, Q235 delivered where Q345 was ordered — compromises structural integrity and triggers re-engineering costs that far exceed the original material savings. Missing or incomplete mill test certificates cause customs holds at destination ports, delaying project schedules and generating demurrage charges. Negative tolerance beyond acceptable limits reduces actual load-bearing capacity below design assumptions, creating safety liability that no amount of post-delivery documentation can resolve. [NEED_CITE: consequences of non-conforming steel in structural engineering projects]
Why Procurement Teams Source SSAW Pipe From Us
We produce the Spiral Welded Steel Pipe Q235 Q345 SSAW Round Pipe on our own lines in Jinan, meaning factory-direct pricing with no trading company markup. Every shipment includes original mill test certificates generated from our in-house physical and chemical laboratory — not forwarded documents from a third-party mill. Our 41 patented technologies include proprietary processes that allow non-standard OD and wall thickness combinations beyond typical catalog ranges. CE certification under EN 10210/10219, ISO 9001:2015 quality management, and acceptance of SGS or BV third-party inspection ensure compliance for EU, North American, and Middle Eastern projects. Professional loading plans optimize container utilization for 6 m and 12 m lengths, and we coordinate FOB, CIF, and DDP shipping to 50+ countries with real-time tracking.
Documentation & Compliance
- Mill test certificate documenting Q235 and Q345 chemical composition, yield strength, and tensile properties per GB/T standards with cross-reference to ASTM A53
- CE certificate confirming EN 10210 and EN 10219 compliance for EU market customs clearance and structural project acceptance
- ISO 9001:2015 quality management certificate covering incoming material inspection, in-process welding control, and final dimensional verification
- SGS or BV third-party inspection report available upon request for projects requiring independent quality verification
- Heat number traceability linking each pipe to its original mill test certificate and chemical analysis record
- Complete customs documentation package including packing list, bill of lading, and certificate of origin for destination port clearance
Packaging, Loading & Delivery
- SSAW pipe bundled with steel strips and edge protectors to prevent coating damage during ocean transit, with galvanized pipes receiving additional plastic wrapping to preserve zinc layer integrity
- Custom length cutting available for 6 m, 6.4 m, and 12 m standard lengths, with non-standard lengths produced to project specifications within the 1–12 m range
- Container loading plans optimized for 10–1000 mm OD pipes, maximizing weight utilization while respecting port handling equipment limits
- Heat number and steel grade stenciled on each pipe end for site identification and traceability verification during installation
- FOB, CIF, and DDP shipping options with door-to-door logistics coordination to 50+ countries including EU, North America, Middle East, and Southeast Asia
- Oiled finish applied to bare pipe surfaces to prevent rust formation during transit, with painted and galvanized options available for immediate installation upon arrival
Ready to Source Your SSAW Pipe Requirement
Submit your Spiral Welded Steel Pipe Q235 Q345 SSAW Round Pipe specifications including outer diameter, wall thickness, length, steel grade, quantity, and destination port. We respond within 12 hours with detailed pricing, production lead time, and available mill test certificates. For non-standard dimensions or custom surface treatments, our technical team provides feasibility assessment and alternative specifications from our 2,800+ model inventory.
Get Your SSAW Pipe Quote with Mill Test Certificate
Send your specifications to admin@sdxjysteel.com or contact us via WhatsApp at +86 188 5315 7756. We will provide pricing, certification details, and delivery schedule for your Spiral Welded Steel Pipe Q235 Q345 SSAW Round Pipe order.
Frequently Asked Questions
Q: Can you provide mill test certificates for both Q235 and Q345 grades on the same order?
A: Yes, each heat of Spiral Welded Steel Pipe receives its own mill test certificate documenting chemical composition and mechanical properties. For mixed-grade orders, we provide separate certificates for Q235 and Q345 material, with heat number traceability linking each pipe to its test record.
Q: What is the minimum order quantity for non-standard wall thickness?
A: The standard MOQ is 5 Ton. For non-standard wall thickness outside our regular production range, we evaluate feasibility based on your specific OD and thickness combination. Our 2,800+ specification inventory covers most custom requirements without additional setup charges.
Q: Do you accept third-party inspection before shipment?
A: Yes, we welcome SGS, BV, or customer-nominated inspection agencies to verify dimensional accuracy, wall thickness, weld quality, and material certification before the Spiral Welded Steel Pipe leaves our facility. Inspection coordination is arranged during the production phase.
Q: How do you handle surface treatment for corrosive environments?
A: For marine or high-humidity applications, we recommend hot-dip galvanizing which provides long-term corrosion protection. For indoor structural use, painted coating is sufficient. Bare pipe receives an oiled finish to prevent transit rust. Surface treatment selection depends on your installation environment and project specifications.
Q: Can you provide steel grade cross-reference guidance for international projects?
A: Yes, we provide equivalence mapping between Chinese GB standards (Q235, Q345), European EN standards (S235JR), and American ASTM standards (A36, A53). This helps ensure material compliance when project specifications reference multiple standard systems.
