Description
Direct Mill Supply, No Middlemen — XJY Structure produces Q235B SSAW steel pipe from our own steel mill, ensuring full material traceability from hot-rolled coil to finished welded pipe for pipeline and structural projects.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235B SSAW Steel Pipe |
| Product Type | Spiral Submerged Arc Welded (SSAW) Steel Pipe |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR |
| Standard | ASTM, EN, GB, BS, DIN, JIS |
| Section Shape | Round |
| Outer Diameter | 219–3220 mm |
| Length | 6 m / 12 m |
| Technique | SSAW (Spiral Submerged Arc Welded) |
| Surface Treatment | Black Painted / 3PE |
| Tolerance | ±1% |
| Ends | Plain / Beveled (as per standard) |
| Application | Fluid transport / Gas pipeline / Oil pipeline / Structure pipe / Boiler pipe / Hydraulic pipe / Chemical fertilizer pipe |
| MOQ | 2 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Onshore and offshore transmission pipelines, gathering lines, distribution networks |
| Municipal Infrastructure | Water supply mains, sewage conveyance, stormwater drainage systems |
| Industrial Construction | Plant pipe racks, structural piling, platform support columns |
| EPC Projects | Cross-country pipeline segments, pump station piping, intake and outfall structures |
What Negative Tolerance Overrun Costs on a Pipeline Project
A two-ton weight shortfall on a single shipment can stall an entire pipeline commissioning.
On a gas pipeline project in Jakarta, a batch of SSAW pipe arrived with wall thickness consistently below the lower tolerance limit. The third-party inspector rejected the lot on arrival. The pipes sat at the port for weeks, accumulating demurrage charges while the project team scrambled for replacements. The root cause was a supplier who quoted on theoretical weight but delivered below-spec material — a gap that only surfaced during physical inspection. [NEED_CITE: EN 10204 inspection certificate types and material acceptance criteria]
Matching Large-Diameter SSAW Pipe to Pipeline and Piling Demands
The OD 219–3220 mm range covers everything from municipal water distribution headers to major cross-country oil transmission lines. For piling and structural columns, the spiral weld seam orientation distributes stress more evenly under axial compression compared to longitudinal seam alternatives. The Q235B and Q345 grades serve general structural and moderate-pressure fluid transport, while S355JR extends the range to higher-load infrastructure applications. As an SSAW steel pipe supplier with in-house coil-to-pipe production, XJY Structure controls every stage — from slab reheating through final coating — eliminating the material sourcing gaps that plague brokers who assemble orders from multiple mills.
Engineering Compliance and Certification Requirements
Pipeline projects governed by EN or ASTM frameworks require documented proof that each pipe conforms to the specified grade and manufacturing standard. For European market delivery, EN 10204 Type 3.1 or 3.2 certificates are typically mandatory, with full heat-level traceability from coil to finished pipe. In Southeast Asia and the Middle East, third-party inspection by SGS, BV, or TÜV is standard practice before shipment. The 3PE anti-corrosion coating system — fusion-bonded epoxy, copolymer adhesive, and polyethylene outer layer — must meet thickness and adhesion benchmarks per DIN 30670 or equivalent. [NEED_CITE: DIN 30670 3PE coating specification for buried steel pipelines] Beveled ends per project welding procedure specifications ensure field joint integrity, while plain ends serve mechanical coupling applications.
Steel Grade Selection and SSAW Process Fundamentals
The Q-series grades (Q195, Q235, Q345) follow the Chinese GB standard system, where the number denotes minimum yield strength in MPa. Q235B is the workhorse grade for general structural and low-to-medium pressure pipeline applications across Asia and Africa. S235JR, S275JR, and S355JR are the European EN equivalents, with JR indicating impact testing at room temperature — essential for projects in temperate climates where brittle fracture risk must be controlled. The SSAW process forms the pipe from hot-rolled coil in a continuous spiral, with submerged arc welding on both inner and outer seams. This method excels at large diameters above 500 mm where LSAW becomes cost-prohibitive, and produces longer continuous lengths that reduce field weld joints. The spiral seam geometry also provides favorable residual stress distribution under internal pressure.
Hidden Costs of Sourcing from Fragmented Suppliers
When a buyer sources SSAW steel pipe through a trading company rather than a mill-integrated fabricator, the chain of custody breaks at the coil stage. Material certificates may reference a coil that was never physically tested. Wall thickness can drift below tolerance because the trader has no production oversight. Welding procedure qualifications may not exist or may not match the actual welders on the floor. The consequences are not abstract: customs holds due to missing certificates, field weld failures from incorrect bevel angles, and coating delamination from inadequate surface preparation. [NEED_CITE: material traceability requirements in EN 10204 certification standards]
Why Project Teams Source SSAW Steel Pipe from XJY Structure
XJY Structure operates its own steel production facility with three rolling lines and maintains over 2,800 raw material specifications in stock — meaning coil procurement, pipe forming, welding, and coating all happen under one quality management system. When a project engineer in Lagos or Riyadh requests an EN 10204 3.2 certificate for S355JR pipe, the test results come from our own laboratory, tied to specific heat numbers that trace back to the original coil. Our welding procedures are qualified per AWS and EN standards, and our welders hold current certifications. For oversized diameters approaching 3220 mm, we handle the specialized loading and lashing engineering in-house, rather than handing off to a third-party packer who has never seen the product. Complete documentation packages — WPS, PQR, weld maps, dimensional inspection reports, and coating thickness records — ship with every order.
Documentation & Compliance
- Mill Test Certificate documenting Q235B chemical composition and mechanical properties per GB/T 9711, with heat number traceability from coil to finished pipe
- EN 10204 Type 3.1 inspection certificate for S235JR/S355JR grades supplied to European and Middle East pipeline projects
- ISO 9001 quality management certificate covering the full SSAW steel pipe production process from coil slitting to final coating
- SGS or BV third-party inspection report available for pre-shipment verification of dimensions, weld quality, and coating thickness
- Material traceability report linking each pipe to its coil heat number, welding procedure, and inspection batch
- Export documentation package including commercial invoice, packing list, bill of lading, and certificate of origin for customs clearance
Packaging, Loading & Delivery
- Q235B SSAW pipes bundled with steel strip ties and edge protectors, with black painted surface shielded by interlayer separators to prevent coating damage during ocean transit
- 3PE coated pipes loaded with nylon sling belts and timber cradle supports to preserve the polyethylene outer layer — no chain contact permitted on coated surfaces
- Large-diameter pipes (OD above 1500 mm) shipped as individual pieces with custom steel cradles, loaded per engineered stowage plan to maximize container or breakbulk vessel utilization
- 6 m and 12 m standard lengths available; custom cut lengths coordinated with project welding spread schedules to minimize field joints
- Each pipe marked with heat number, steel grade, OD, wall thickness, and length in weather-resistant paint stencil for site identification
- FOB, CIF, and DDP terms available; professional oversized cargo loading at Qingdao port with complete export documentation
Getting Your SSAW Steel Pipe Quote Started
Send your project drawings or pipe schedule specifying outer diameter, wall thickness, steel grade, length, coating requirement, and destination port. Our engineering team responds within 24 hours with a detailed quotation covering material, fabrication, coating, packing, and shipping — along with a shop drawing timeline and production schedule. For projects requiring EN 10204 3.2 certification or third-party inspection, confirm the requirement at inquiry stage so we can align the quality documentation package to your specification.
Frequently Asked Questions
Q: What is the difference between SSAW, LSAW, and ERW welded pipe for pipeline use?
A: SSAW (Spiral Submerged Arc Welded) pipe is formed from coil in a continuous spiral and is most economical for large diameters above 500 mm. LSAW (Longitudinal Submerged Arc Welded) uses a straight seam and is preferred for high-pressure applications with stricter weld inspection requirements. ERW (Electric Resistance Welded) is suited to smaller diameters and lower-pressure services. The choice depends on project diameter, pressure rating, and applicable code.
Q: Can Q235B be substituted for S235JR or A36 in international projects?
A: Q235B, S235JR, and A36 have similar yield strength levels but differ in chemical composition limits, impact testing requirements, and deoxidation practices. Substitution should be confirmed against the project specification and approved by the engineer of record. We supply all three grades and can provide cross-reference documentation.
Q: What does the 3PE coating system include and how long does it last?
A: 3PE coating consists of three layers: a fusion-bonded epoxy primer for adhesion and corrosion inhibition, a copolymer adhesive tie layer, and a polyethylene outer layer for mechanical protection. Service life depends on soil conditions, operating temperature, and coating thickness class per DIN 30670. We apply 3PE in-line after pipe welding and provide coating thickness and adhesion test reports.
Q: What is the minimum order quantity and can you supply custom lengths?
A: The MOQ is 2 tons. Standard lengths are 6 m and 12 m. Custom cut lengths can be arranged based on project requirements and welding spread plans. Beveled or plain ends are available per your welding procedure specification.
Q: Do you handle export documentation and oversized cargo loading?
A: Yes. We prepare the complete export documentation package including mill test certificates, packing lists, bills of lading, and certificates of origin. For large-diameter pipes requiring breakbulk or flat-rack shipping, our loading team engineers the cradle and lashing plan to ensure safe transit.
Start Your SSAW Steel Pipe Inquiry Today
Submit your pipe schedule, steel grade, coating requirement, and destination port to receive a detailed quotation with mill test certificate specifications and production timeline.
Contact: 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
