Description
Factory-Direct SSAW Pipe Mill — We produce Q235B and Q345B spiral welded steel pipe from our own steel mill, controlling chemistry and rolling from slab to finished pipe under one quality system.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | SSAW Welded Steel Pipe |
| Product Type | SSAW Welded Steel Pipe / Spiral Submerged Arc Welded Pipe |
| Steel Grade | Q235B, Q345B, Q195-Q345 |
| Standard | BS, EN, GB, AISI, ASTM, DIN, JIS |
| Section Shape | Round |
| Size Range | OD 219mm–4064mm |
| Technique | SSAW (Spiral Submerged Arc Welded) |
| Surface Treatment | Hot Rolled / Customer’s Requirement |
| Tolerance | ±1% |
| Length | 6m / 12m |
| Ends | Plain / Beveled (as required) |
| Application | Water engineering, Petrochemical industry, Chemical industry, Power industry, Agriculture irrigation, Urban construction, Fluid transport, Oil & gas pipeline, Structure pipe |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Water & Wastewater | Large-diameter raw water intake lines, sludge transfer mains, stormwater outfall pipes |
| Petrochemical | Process water circuits, cooling water loops, flare stack support columns |
| Power Generation | Circulating water discharge pipes, coal handling conveyor supports, boiler feed structural columns |
| Urban Construction | Bridge piers, underground utility casings, pile sleeves for foundation work |
| Agriculture Irrigation | Main canal conveyance lines, pump station headers, siphon pipes for paddy fields |
Where Material Traceability Breaks Down on Large-Diameter Spiral Pipe
A missing heat number on a 3000mm OD pipe can shut down an entire pipeline acceptance.
When buyers source SSAW spiral welded steel pipe overseas, the most frequent failure point is not welding quality — it is the gap between the fabricator and the steel source. Third-party procurement creates broken certification chains: the mill test certificate references a heat number the fabricator cannot trace back to slab chemistry. On water engineering projects requiring EN or ASTM compliance, customs authorities and third-party inspectors reject shipments when traceability documentation does not align with the physical pipe markings. [NEED_CITE: material traceability requirements in EN 10219 structural hollow sections]
Matching OD 219–4064mm to Infrastructure Load and Corrosion Demands
The SSAW process produces spiral welded steel pipe in diameters where seamless becomes economically unviable — from 219mm utility casings up to 4064mm intake headers. For water engineering and irrigation networks, Q235B provides adequate strength for gravity-flow and low-pressure conveyance, while Q345B serves pressurized petrochemical circuits and structural columns in power plant frameworks. The spiral weld seam distributes stress along the helix, making this process suitable for large-diameter, thin-to-medium wall applications where internal pressure and external soil loading must both be managed. As a vertically integrated SSAW spiral welded steel pipe supplier, we control slab chemistry through final weld inspection.
Structural Code Compliance and Surface Protection Selection
Engineering specifications for SSAW spiral welded steel pipe typically reference EN 10219 for cold-formed welded structural hollow sections or API 5L for pipeline transport — the applicable standard determines whether Q235B or Q345B chemistry meets the project’s yield and tensile requirements. In buried pipeline applications across petrochemical and water sectors, surface treatment selection becomes critical: hot-rolled finish suits above-ground structural use, while 3PE coating or FBE epoxy protects against soil corrosion in direct-buried oil & gas and water mains. [NEED_CITE: surface protection systems for buried steel pipelines per ISO 21809] Wall thickness tolerance of ±1% ensures that theoretical weight calculations used in structural design match the delivered product — a factor that directly affects load-bearing verification during engineering acceptance.
Understanding Q235B, Q345B and the SSAW Welding Process
Q235B and Q345B represent the two most widely specified grades in Chinese steel pipe production. Q235B delivers moderate yield strength suitable for fluid transport, piling, and general structural applications, while Q345B provides higher yield strength for pressurized pipelines and load-bearing columns in industrial frameworks. Both grades conform to GB/T 700 and GB/T 1591 respectively, with equivalence mapping available to EN S235/S355 and ASTM A252/A253 systems. The SSAW (Spiral Submerged Arc Welded) process forms steel coil into a helical cylinder and welds using submerged arc on both inner and outer seams — this method allows production of large diameters up to 4064mm from narrower coil widths, reducing material waste compared to plate-based LSAW. The spiral seam geometry also provides inherent resistance to crack propagation along the weld line. Surface treatment options — hot rolled, 3PE, FBE, or painted — are selected based on the service environment: atmospheric exposure, buried conditions, or submerged service each demand different coating systems.
The Hidden Cost of Tolerance Deviation and Certification Gaps
When wall thickness falls below the specified negative tolerance limit, the pipe passes visual inspection but fails ultrasonic testing at the project site — resulting in rejected shipments, costly re-procurement, and schedule delays. [NEED_CITE: dimensional tolerance requirements for SSAW pipe per API 5L and EN 10219] Material certificates that cannot be traced to specific heat numbers create compliance failures during customs clearance in EU and Middle East markets, where EN 1090 and CE marking require full documentation chains. Choosing an SSAW spiral welded steel pipe supplier with integrated steel production eliminates the gap between material source and fabrication — every heat number on the mill test certificate traces directly to our own slab casting and rolling operations.
Why Project Procurement Teams Source from XJY Structure
Our steel mill produces the raw coil and plate that feeds directly into our SSAW pipe fabrication line — there is no intermediary material trader between slab chemistry and finished pipe. Every batch undergoes chemical composition analysis and mechanical testing in our in-house laboratory before release. With over 2,800 specifications maintained in inventory, we fulfill mixed-size orders for water engineering projects requiring multiple OD and wall thickness combinations in a single shipment. Our production system holds ISO 9001 certification, and third-party inspection through SGS, BV, or TUV is available for every order. For projects requiring CE marking or EN compliance, we provide complete documentation packages including WPS, PQR, weld maps, and dimensional inspection reports. Professional loading plans account for the oversized nature of large-diameter spiral pipe, ensuring safe lashing and container optimization for 6m and 12m lengths.
Documentation & Compliance
- Mill Test Certificate documenting Q235B and Q345B chemical composition and mechanical properties per GB/T 700 and GB/T 1591, with heat number traceability to slab casting
- CE certificate for structural hollow sections conforming to EN 10219, supporting customs clearance across EU member states
- ISO 9001 quality management system certificate covering the full production chain from raw steel to finished SSAW pipe
- SGS or BV third-party inspection report available for wall thickness, weld seam quality, and coating thickness verification
- Material traceability documentation linking each pipe to its heat number, chemical analysis, and mechanical test results
- Complete customs documentation package including packing list, bill of lading, and certificate of origin for SSAW spiral welded steel pipe shipments
Packaging, Loading & Delivery
- SSAW spiral welded steel pipe in OD 219–1200mm bundled with steel strips and edge protectors; pipes above 1200mm loaded individually with cradle supports to prevent ovalization during ocean transit
- Hot-rolled surface finish pipes receive anti-rust oil coating before bundling; 3PE or FBE coated pipes use padded separators to preserve coating integrity during handling and shipping
- 6m and 12m lengths optimized for 40ft open-top and flat-rack containers; large-diameter pipe above 2000mm shipped via breakbulk with professional lashing and chocking plans
- Pipe ends protected with plastic caps — plain ends for socket-weld connections, beveled ends prepared to API or project-specified angle for butt-weld field joints
- Each pipe marked with heat number, steel grade (Q235B/Q345B), OD, wall thickness, and length for site identification and traceability verification
- Delivery terms available as FOB, CIF, or DDP with complete export documentation and tracking through to project site
Starting Your SSAW Pipe Procurement
Submit your project drawings or pipe schedule specifying OD, wall thickness, steel grade, length, quantity, and surface treatment requirement. We respond within 24 hours with a detailed quotation including material cost, fabrication, coating, packing, and shipping — along with the mill test certificate format and production timeline for your SSAW spiral welded steel pipe order.
Request Your SSAW Pipe Quotation and Mill Test Certificate
Share your project specifications — OD, wall thickness, steel grade, quantity, and destination port — to receive a detailed quotation with full material documentation.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
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: What is the difference between SSAW, LSAW, and seamless steel pipe for my project?
A: SSAW spiral welded steel pipe is produced by helically forming steel coil and welding with submerged arc, making it cost-effective for large diameters from 219mm to 4064mm. LSAW uses plate formed into a cylinder with a straight longitudinal seam, typically for diameters above 400mm. Seamless pipe is extruded from a solid billet and suits high-pressure applications in smaller diameters. The choice depends on your project’s diameter range, pressure requirements, and budget.
Q: How does XJY Structure ensure material traceability from steel mill to finished pipe?
A: As a vertically integrated producer, we cast our own steel slabs, roll them into coil and plate, and fabricate them into SSAW pipe — all under one quality system. Every pipe carries a heat number that traces back to the original chemical composition and mechanical test results, eliminating the certification gaps that occur when fabricators source material from third-party traders.
Q: What surface treatment options are available for buried SSAW pipeline projects?
A: For buried pipelines in water engineering and oil & gas applications, we offer 3PE (three-layer polyethylene) coating, FBE (fusion-bonded epoxy), and custom painting systems. Hot-rolled finish is available for above-ground structural applications. The coating selection depends on soil corrosivity, design life, and project specification requirements.
Q: Can you produce custom OD, wall thickness, and length beyond standard sizes?
A: Yes. Our SSAW production line covers OD 219mm to 4064mm with ±1% tolerance. We accommodate non-standard wall thickness and custom cut lengths based on project requirements. The MOQ is 1 Ton, and we maintain over 2,800 specifications in stock for rapid fulfillment of mixed-size orders.
Q: What documentation do you provide for customs clearance and project acceptance?
A: Every shipment includes a mill test certificate with heat number traceability, packing list, bill of lading, and certificate of origin. For EU projects, we provide CE certification per EN 10219. Third-party inspection reports from SGS, BV, or TUV are available upon request. Complete welding documentation including WPS and PQR is provided for structural applications.
