Description
Factory-Direct SSAW Spiral Welded Steel Pipe — Produced in-house with physical and chemical lab verification per heat, eliminating middleman markups on large-diameter pipeline orders.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235B/Q345B SSAW Spiral Welded Steel Pipe |
| Product Type | Spiral Welded Steel Pipe (SSAW) |
| Steel Grade | Q195, Q215, Q235, Q235B, Q345, Q345B, 10#, 20#, Gr.A, Gr.B |
| Standard | API 5L, ASTM A252, ASTM A53, GB, BS, EN, AISI, DIN, JIS |
| Section Shape | Round |
| Size Range | Outer Diameter 159–3200 mm |
| Wall Thickness | 0.3–16 mm |
| Length | 5.8–11.8 m (or as customer’s requirements) |
| Technique | SSAW / ERW / SAW |
| Surface Treatment | Hot Rolled; External: FBE / 2PE / 3PE / 3PP; Internal: FBE |
| Tolerance | ±1% |
| Ends | Plain end / Beveled end / Threaded and coupled; PVC caps as end protector |
| Application | Piling, heat-supply, water & gas pipeline, petroleum and natural gas pipeline, chemistry industry, electric power, oil pipeline, fluid transport, structure pipe, drill pipe |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Oil & gas transmission pipelines, piling foundations for industrial plants, heat-supply network infrastructure |
| Construction Companies | Structural piling for high-rise buildings and bridges, drainage and drinking water conveyance systems |
| Chemical & Power Plants | Anti-corrosion fluid transport lines with 3PE/FBE coating, circulating water pipes for power generation |
| Municipal Engineering | Coal gas and fuel gas distribution networks, mine slurry transport pipelines |
What Wall-Thickness Tolerance Costs on a SSAW Spiral Welded Steel Pipe Order
A ±1% tolerance on a 3200mm OD pipe means the difference between passing SGS field inspection and getting an entire container rejected at the port.
I have seen project teams order SSAW spiral welded steel pipe for piling work only to discover the wall thickness drifted below the minimum specified value. The mill claimed it was within “industry practice,” but the SGS inspector on-site had a different opinion. The entire shipment was flagged, re-rolled at the buyer’s expense, and the project timeline slipped by weeks. With outer diameters reaching 3200mm and wall thicknesses up to 16mm, even small deviations compound into significant structural and financial risk. [NEED_CITE: tolerance requirements for spiral welded steel pipe under API 5L and ASTM A252]
Matching Large-Diameter SSAW Pipe to Piling and Pipeline Engineering
When an EPC contractor specifies SSAW spiral welded steel pipe for a piling project or a long-distance gas transmission line, the pipe must carry design loads without buckling under soil pressure or internal fluid stress. Our 159–3200mm OD range covers everything from small-bore distribution lines to major river-crossing pipelines. The ±1% wall thickness tolerance ensures each joint meets the structural engineer’s calculation assumptions. For corrosive environments such as coastal piling or underground gas mains, the 3PE external coating per DIN30670 and internal FBE lining per SY/T0442 provide decades of protection without field-applied wrapping.
Engineering Compliance and Certification Requirements
Large-diameter SSAW pipe used in structural piling or pressure-rated pipeline work must comply with recognized engineering codes. API 5L governs petroleum and natural gas transmission, while ASTM A252 covers steel pipe piles. For projects in the European market, CE certification under EN 10210 and EN 10219 is often a customs and site-acceptance prerequisite. [NEED_CITE: CE marking requirements for structural hollow sections under EN 10210] Steel grade selection matters: Q235B serves general structural and low-pressure fluid applications, while Q345B provides higher yield strength for heavy-load piling and high-pressure pipeline work. Our in-house laboratory tests every heat for chemical composition and mechanical properties before release, and third-party inspection by SGS or BV is available at any production stage.
Steel Grade Selection and SSAW Process Fundamentals
The Q-series grades (Q195 through Q345B) follow the Chinese GB standard system, where the number indicates minimum yield strength in MPa. Q235B and Q345B are the most commonly specified grades for SSAW spiral welded steel pipe in infrastructure projects. For international projects, these map to API 5L Gr.A and Gr.B, or ASTM A53 Grade A and B, depending on the specification framework. [NEED_CITE: steel grade equivalence between GB Q-series and API 5L / ASTM standards]
The SSAW (submerged arc welded, spiral) process forms the pipe by helically winding steel coil and welding both inner and outer seams under flux. This method allows production of very large diameters — up to 3200mm — from relatively narrow coil, making it cost-effective for long-distance pipeline and piling applications. Compared to ERW (electric resistance welded), SSAW offers better suitability for thick-wall, large-OD work. Compared to seamless, SSAW provides significant cost savings at diameters above 500mm where seamless production becomes economically impractical.
Surface treatment selection depends on the service environment. Hot-rolled finish suits temporary or indoor applications. For underground or submerged service, 3PE (three-layer polyethylene) per DIN30670 provides the highest corrosion resistance, combining epoxy primer, adhesive copolymer, and polyethylene outer layer. FBE (fusion-bonded epoxy) per SY/T0315 offers excellent adhesion and cathodic disbondment resistance for buried pipelines. Internal FBE lining reduces friction and prevents corrosion from transported fluids.
Hidden Costs of Procuring the Wrong SSAW Pipe Specification
Ordering SSAW spiral welded steel pipe without verified mill test certificates creates a cascade of downstream failures. Material that does not match the specified steel grade may pass visual inspection but fail ultrasonic testing or mechanical property checks at the project site. Missing or incomplete CE documentation causes customs holds in EU markets, delaying the entire shipment. [NEED_CITE: consequences of non-compliant steel pipe certification in international construction projects] Wall thickness below the specified tolerance compromises structural capacity, potentially requiring costly reinforcement or full replacement of installed sections. The true cost of a rejected container includes re-rolling, return freight, project delay penalties, and damaged supplier credibility.
Why Engineering Procurement Teams Source SSAW Pipe From Xin Jiyuan
Our factory operates three dedicated production lines for SSAW spiral welded steel pipe, with in-house physical and chemical laboratories that test every heat before release. This means you receive original mill test certificates with verified chemical composition and mechanical properties — not paperwork generated after the fact. We hold ISO 9001:2015 certification, CE marking under EN 10210 and EN 10219 for European market compliance, and accept SGS or BV third-party inspection at any stage. With over 2,800 specifications in our catalog and the ability to produce non-standard diameters and wall thicknesses, we consolidate your pipe procurement into a single source, reducing coordination overhead and delivery risk. Our professional loading team optimizes container stowage for large-diameter pipe, minimizing freight cost per meter.
Documentation & Compliance
- Mill test certificate documenting Q235B/Q345B chemical composition and mechanical properties per API 5L / ASTM A252, issued per heat number
- CE certificate under EN 10210 / EN 10219 for structural hollow sections, required for EU market customs clearance and site acceptance
- ISO 9001:2015 quality management system certificate covering the full SSAW spiral welded steel pipe production process
- SGS or BV third-party inspection report available upon request, covering dimensional check, coating thickness, and weld integrity
- Material traceability by heat number from coil input through final inspection, supporting project audit requirements
- Complete customs document package including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- SSAW spiral welded steel pipe bundled with steel strip bands and edge protectors to prevent coating damage during ocean transit, with PVC end caps preserving beveled or threaded ends
- 3PE/FBE coated pipes stored and loaded with separated layers to prevent abrasion of the external coating, critical for long-length 11.8m pipes
- Container loading optimized for 159–3200mm OD range, with nested small-diameter pipes inside large-diameter pipes where specification allows, maximizing container utilization
- Cut-to-length service available for non-standard project lengths beyond the standard 5.8–11.8m range, with precise saw-cutting and end finishing
- Heat number and steel grade stenciled on each pipe end for site traceability, with color-coding by grade per customer specification
- Shipping terms FOB, CIF, or DDP available, with door-to-door logistics coordination to 50+ countries including EU, North America, Middle East, and Southeast Asia
Requesting a Quotation for Your SSAW Pipeline Project
Submit your specification requirements — outer diameter, wall thickness, steel grade, coating type, quantity, and destination port — and our engineering team responds within 12 hours with a detailed quotation including unit price, delivery timeline, payment terms, and applicable certifications. For non-standard dimensions or custom coating requirements, we provide technical evaluation and production feasibility confirmation before you commit.
Get Your SSAW Spiral Welded Steel Pipe Quote With Mill Test Certificate
Send your specification sheet to admin@sdxjysteel.com or contact us via WhatsApp at +86 188 5315 7756 to receive pricing and original mill test certificates for your next pipeline or piling project.
Frequently Asked Questions
Q: How do Q235B and Q345B steel grades map to API 5L and ASTM standards?
A: Q235B generally corresponds to API 5L Gr.A or ASTM A53 Grade A in terms of yield strength range, while Q345B maps to API 5L Gr.B or ASTM A53 Grade B with higher minimum yield strength. We provide detailed equivalence documentation with each quotation to support your specification compliance review.
Q: Can you provide mill test certificates and accept third-party inspection before shipment?
A: Yes. Every SSAW spiral welded steel pipe order includes an original mill test certificate documenting chemical composition and mechanical properties per heat number. We also welcome SGS or BV third-party inspection at any production stage — incoming material, in-process welding, or final dimensional and coating check.
Q: What is the difference between 3PE, FBE, and 2PE coating, and which standard applies?
A: 3PE (three-layer polyethylene) per DIN30670 provides the highest corrosion protection for buried pipelines, combining epoxy primer, adhesive, and polyethylene outer layer. FBE (fusion-bonded epoxy) per SY/T0315 offers excellent adhesion for cathodic-protected buried lines. 2PE is a two-layer system suitable for less aggressive environments. We apply all coating types in-house with thickness verification per standard.
Q: Can you produce non-standard outer diameters or wall thicknesses beyond the listed range?
A: Yes. While our standard SSAW range covers 159–3200mm OD and 0.3–16mm wall thickness, we regularly produce custom non-standard specifications for project-specific requirements. Submit your drawing or specification and we confirm feasibility and lead time.
Q: What shipping terms do you offer and how do you optimize loading for large-diameter pipes?
A: We offer FOB, CIF, and DDP terms with door-to-door logistics to 50+ countries. For large-diameter SSAW pipe, our loading team optimizes container stowage by nesting smaller pipes inside larger ones where specifications permit, reducing freight cost per meter. Professional lashing and separation prevent transit damage to coatings and ends.
