Description
Factory-Direct SSAW Pipe Manufacturing — In-house physical and chemical laboratory testing on every heat, with original mill test certificates issued per batch before shipment.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Hot-Dip Galvanized Spiral Welded Steel Pipe |
| Product Type | Spiral Welded Steel Pipe (SSAW) |
| Steel Grade | Q195, Q235A-B, Q345A-E, 20#, 10#, 16Mn, ASTM A36, ASTM A53, ASTM A106, ASTM A500, SS400, St37, St52, S235JR, S355JR, Grade B, X42, X52, X60, X70, L245, L290, L360, L390, L415 |
| Standard | GB/T 3091, GB/T 13912, BS 1387, ASTM F1083, ASTM A53, ASTM A106, ASTM A500, EN 10219, EN 10210 |
| Section Shape | Round |
| Size Range | OD 10–1000 mm |
| Wall Thickness | 2–50 mm |
| Length | 6–12 m (or customized) |
| Technique | Spiral Welded (SSAW) |
| Surface Treatment | Hot-Dip Galvanized / Black Painting |
| Tolerance | ±1% |
| Ends | Plain / Beveled (per standard) |
| Application | Construction piling, foundation support, structural columns, fluid transport, greenhouse structures, fence posts, curtain walls, machinery parts |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Foundation piling for high-rise buildings, bridge substructure support, industrial plant column bases |
| Construction Companies | Structural columns for warehouses, greenhouse frame systems, curtain wall support frames |
| Machinery Manufacturers | Conveyor support posts, equipment base frames, pump well casing |
| Infrastructure Developers | Highway signpost foundations, guardrail posts, water and gas pipeline transport |
What Zinc Coating Integrity Costs on a Piling Project Halfway Across the Ocean
A single container of scratched galvanized pipes can trigger full on-site recoating at ten times the original galvanizing cost.
On a piling project in the Middle East, a batch of hot-dip galvanized spiral pipes arrived with zinc flaking at the tube ends — the loading crew had stacked them without edge separators, and ocean vibration did the rest. The site inspector rejected the entire lot. [NEED_CITE: hot-dip galvanized coating adhesion requirements per ASTM A153] The contractor paid for local touch-up painting that exceeded the galvanizing cost per meter. For EPC buyers sourcing a Hot-Dip Galvanized Spiral Welded Steel Pipe Supplier, the risk is not just material cost — it is schedule delay, customs hold, and the credibility loss of delivering non-compliant piles to a client’s foundation crew.
Matching Large-Diameter SSAW Pipe to Foundation and Piling Loads
Piling and foundation support demand pipes that carry compressive loads through variable soil conditions while resisting corrosion from groundwater and saline environments. A Hot-Dip Galvanized Spiral Welded Steel Pipe in Q345B or S355JR delivers the yield strength range needed for heavy-load bearing, while the spiral weld seam allows production at diameters up to 1000 mm — a size range that ERW cannot reach economically. The hot-dip zinc coating provides sacrificial corrosion protection that outlastes painted surfaces by multiples in buried or submerged conditions. Our in-house laboratory verifies coating thickness per GB/T 13912 before every shipment, ensuring the zinc layer meets project specification without requiring third-party re-testing at destination.
Engineering Compliance Across Piling, Structural, and Fluid Applications
Foundation piling typically falls under EN 1993 or AISC design frameworks, where the steel grade must conform to recognized standards with traceable chemistry and mechanical properties. [NEED_CITE: EN 10210 structural hollow section compliance requirements] For European projects, CE certification under EN 10210 and EN 10219 is not optional — it determines whether the shipment clears customs or sits at port. In North America, ASTM A53 and ASTM A500 govern structural and fluid applications respectively. The Hot-Dip Galvanized Spiral Welded Steel Pipe we produce carries both CE and ISO 9001:2015 certification, with mill test certificates documenting chemical composition and tensile results per heat number. For fluid transport applications — water mains, pump wells, gas distribution — the same SSAW process with beveled ends allows field welding to API-compatible standards, while the galvanized variant serves above-ground structural columns where corrosion resistance is prioritized over weldability at joints.
Steel Grade Selection: Q-Series, S-Series, and API Line Pipe Grades
The Q-series (Q195 through Q345) follows Chinese GB standards, where the number indicates minimum yield strength in MPa — Q235 yields at approximately 235 MPa, Q345 at 345 MPa. These map directly to the S-series under EN standards: S235JR and S355JR respectively. [NEED_CITE: steel grade equivalence between GB Q-series and EN S-series] For buyers specifying ASTM, A36 aligns with Q235 and S235JR in structural applications, while A500 Grade B and C serve structural hollow sections with tighter tolerance requirements. The API line pipe grades — X42 through X70 and L245 through L415 — are designated for pressurized fluid transport where weld integrity and hoop stress resistance matter more than structural load-bearing. The SSAW spiral welding process is particularly suited to these large-diameter, thick-wall configurations because the helical seam distributes stress more evenly than a straight longitudinal weld under internal pressure. Hot-dip galvanizing adds a zinc layer of 65–300 microns depending on immersion time, providing barrier and cathodic protection that black painting cannot match in corrosive soil or marine environments.
The Hidden Cost of Unverified Coating Thickness and Missing Mill Certificates
Pipes with zinc coating below specification corrode at the weld seam first — exactly where structural integrity matters most. [NEED_CITE: hot-dip galvanized coating minimum thickness per ISO 1461] When a project inspector requests the mill test certificate and finds no heat number traceability, the entire batch may be held pending destructive re-testing. For a Hot-Dip Galvanized Spiral Welded Steel Pipe Supplier without in-house laboratory capability, the buyer absorbs the cost of third-party inspection at destination, plus any replacement lead time. Certification gaps — missing CE marks for EU-bound shipments, incomplete SGS reports for Middle East tenders — cause customs delays that no amount of freight discount can recover.
Procurement Confidence: Laboratory Verification, Full-Range Production, and Certified Export
Every Hot-Dip Galvanized Spiral Welded Steel Pipe leaving our facility passes through our in-house physical and chemical laboratory — spectrographic analysis for composition, tensile testing for mechanical properties, and coating thickness measurement per GB/T 13912. We hold 41 patented technologies and produce across 2,800+ specifications, meaning non-standard OD and wall thickness combinations do not require sourcing from a second supplier. CE certification under EN 10210/EN 10219 covers European market compliance, while ISO 9001:2015 governs our quality management system. Third-party inspection by SGS or BV is accepted at any production stage. Our professional loading team designs container plans specific to pipe diameter and wall thickness, with bottom support structures and edge protectors that prevent zinc coating damage during ocean transit — a lesson learned from real project failures, not theoretical manuals. We export to 50+ countries across the EU, North America, Middle East, Southeast Asia, and South America, with door-to-door logistics coordination including customs documentation.
Documentation & Compliance
- Mill test certificate documenting Q235B/Q345B chemical composition and yield strength per GB/T 3091 and EN 10219, issued per heat number
- CE certificate under EN 10210/EN 10219 for structural hollow sections exported to European Union member states
- ISO 9001:2015 quality management system certificate covering SSAW pipe production and hot-dip galvanizing processes
- SGS or BV third-party inspection report available for pre-shipment coating thickness and dimensional verification
- Material traceability by heat number linking each pipe to its original coil chemistry and mechanical test results
- Customs documentation package including packing list, bill of lading, and certificate of origin for destination clearance
Packaging, Loading & Delivery
- Hot-dip galvanized SSAW pipes bundled with steel strips and separated by rubber edge protectors to preserve zinc coating integrity during transit
- Bottom support frames installed inside containers for large-diameter pipes (OD 500–1000 mm) to prevent rolling and coating abrasion from ocean vibration
- Black-painted variant pipes bundled with waterproof wrapping for outdoor storage at destination before installation
- Custom cutting to project-specific lengths within the 6–12 m range, with beveled ends protected by plastic caps to prevent thread and coating damage
- Heat number and steel grade stenciled on each pipe end for on-site traceability verification by project inspectors
- FOB, CIF, and DDP shipping terms available with professional container loading plans optimized for pipe diameter and wall thickness combinations
Securing Your Quotation with Specifications and Destination Details
Submit your pipe specifications — outer diameter, wall thickness, steel grade, surface treatment preference, quantity, and destination port — via email or WhatsApp. Our team responds within hours with a detailed quotation including unit price, production lead time, applicable certifications, and loading plan preview. For non-standard dimensions or API line pipe grades, we provide custom feasibility assessment before contract signing.
Request Your Hot-Dip Galvanized SSAW Pipe Quote
Send your project specifications to receive pricing, mill test certificate samples, and container loading confirmation.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
