Description
Factory-Direct SSAW Pipe Supply — Every Q345B spiral welded steel pipe rolls from our own mill with original test certificates, cutting out trading markups for bulk pipeline orders.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q345B Spiral Welded Steel Pipe |
| Product Type | Spiral Welded Steel Pipe (SSAW) |
| Steel Grade | Q235, Q345, L175, L210, L245, L320 |
| Standard | GB/T 9711.1, GB/T 9711.2, SY/T 5037, SY/T 5040, API 5L |
| Section Shape | Round |
| Outer Diameter | 219–3000 mm |
| Wall Thickness | 6–24.5 mm |
| Length | 6 m / 6.4 m / 12 m (or customer’s request) |
| Technique | ERW / Spiral Welded |
| Surface Treatment | Hot Rolled / Non-oiled |
| Tolerance | ±1% |
| Ends | Plain / Beveled (per standard) |
| Application | Fluid transportation / Gas pipeline / Oil pipeline / Bridge construction / Building construction / Structural pipe / Drill pipe / Chemical fertilizer pipe |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas Transmission | Long-distance crude oil and natural gas pipeline networks using API 5L grade SSAW pipe |
| Municipal Infrastructure | Urban water supply mains, drainage systems, and sewage treatment plant piping |
| Bridge & Port Engineering | Large-diameter structural piling and foundation support for bridges, wharfs, and marine platforms |
| Industrial Plant Piping | Chemical fertilizer delivery lines and process fluid transport within petrochemical facilities |
| Building Construction | Deep foundation bored piles and retaining wall support structures for high-rise projects |
Why Wall-Thickness Tolerance Decides Whether Your Pipeline Passes Hydrostatic Testing
A ±1% tolerance on a 24.5 mm wall sounds tight — until the thinnest point in a 3000 mm OD pipe fails pressure acceptance at the commissioning stage.
Global EPC buyers sourcing Q345B SSAW spiral welded steel pipe for pressurized fluid or gas transmission frequently discover that dimensional inconsistency across a single length creates weak spots. When wall thickness drifts beyond the ±1% band at the weld seam or the 6 o’clock position, hydrostatic test failures follow — and replacing a buried 12-meter section of large-diameter pipe costs far more than the original material. [NEED_CITE: API 5L hydrostatic test requirements for spiral welded pipe]
Compounding this, many suppliers ship without original mill test certificates tied to heat numbers, leaving project engineers unable to verify whether the Q345 or L320 grade actually matches the purchase specification. Certification gaps at destination ports then trigger customs holds that delay the entire construction schedule.
Matching Large-Diameter SSAW Pipe to Pipeline and Piling Requirements
The 219–3000 mm outer diameter range of this Q345B SSAW spiral welded steel pipe covers everything from municipal water mains to offshore piling foundations. For pressurized oil and gas transmission, API 5L grades L245 through L320 provide the weld integrity and tensile consistency that buried pipelines demand over decades of service. In bridge and port construction, the same large-diameter SSAW format serves as bored piles driven through soft soil to bearing strata — where the spiral weld seam must withstand driving stresses without cracking. We produce each order to the specific standard your project engineer specifies, whether that is GB/T 9711 for domestic pipeline codes or SY/T 5040 for structural piling applications.
Engineering Compliance and Certification for Cross-Border Delivery
Large-diameter spiral welded pipe destined for European, African, or Middle Eastern infrastructure projects must carry documentation that satisfies both the importing country’s customs authority and the project’s quality assurance framework. CE certification under EN 10210 and EN 10219 is mandatory for structural hollow sections entering the EU, while API 5L documentation accompanies oil and gas pipeline shipments globally. [NEED_CITE: EN 10219 cold-formed welded structural hollow sections compliance] Our ISO 9001:2015 quality management system governs production from coil unrolling through final dimensional inspection, and every heat number traces back to its chemical composition report. For projects requiring independent verification, we arrange SGS or BV third-party inspection at the mill before container loading — a step that prevents the certification-gap delays that plague shipments arriving without proper paperwork. Beveled or plain ends are supplied per your welding procedure specification, and standard 12-meter lengths align with typical site joint spacing for pipeline welding crews.
Understanding Q345B and API 5L Grade Selection for Spiral Welded Pipe
The Q-series steel grades (Q235, Q345) follow the Chinese GB standard system where the number indicates minimum yield strength in MPa — Q345B delivers higher load-bearing capacity than Q235B, making it the default choice for pressurized pipelines and structural piling where wall thickness optimization matters. The API 5L grade designations (L175, L210, L245, L320) serve the same function within the international pipeline specification framework, with L320 offering the highest yield point among the grades we stock for SSAW production. [NEED_CITE: steel grade equivalence between GB Q345 and API 5L standards] Spiral submerged arc welding (SSAW) allows continuous production of large-diameter pipe from coiled plate — a process that delivers cost advantages over seamless pipe at diameters above 500 mm while maintaining weld seam quality through dual-sided submerged arc deposition. The hot-rolled, non-oiled surface condition we supply is standard for pipeline applications where field coating (3PE, FBE, or coal tar enamel) will be applied after welding — the mill scale provides temporary corrosion protection during storage and transit without interfering with coating adhesion.
The Hidden Cost of Accepting Unverified Spiral Welded Pipe
Purchasing Q345B SSAW spiral welded steel pipe without original mill test certificates or third-party inspection creates a chain of downstream risks that materialize only after the pipe reaches the job site. A heat number that cannot be traced to a chemical composition report means the project QA team must either reject the shipment or accept unverified material — neither option protects the construction schedule. [NEED_CITE: material traceability requirements in API 5L pipeline specifications] Wall thickness that falls below the specified tolerance at the weld seam leads to hydrostatic test failures during commissioning, forcing excavation and replacement of buried sections at multiples of the original pipe cost. Missing CE or API documentation at destination ports triggers customs holds that idle construction crews and equipment while paperwork is resolved — delays measured in weeks, not days.
Why Bulk Buyers Source Q345B SSAW Pipe from Xin Jiyuan
We operate three dedicated SSAW production lines in Jinan capable of manufacturing spiral welded pipe from 219 mm to 3000 mm outer diameter, giving you factory-direct pricing without trading company margins layered onto the tonnage. Our in-house metallurgical laboratory issues original mill test certificates for every heat, documenting chemical composition and mechanical properties against the specified standard — whether that is GB/T 9711, API 5L, or SY/T 5037. With over 2,800 specifications maintained in ready stock across our full product range, standard-size Q345B SSAW pipe ships within typical production lead times while custom non-standard diameters or wall thicknesses are produced to order. We hold Lloyd’s CE certification under EN 10210 and EN 10219 for European market compliance, ISO 9001:2015 for quality management, and we facilitate SGS or BV third-party inspection at the mill for projects requiring independent verification. Our export team handles professional container loading optimization for large-diameter pipe — a capability that matters when improper stowage causes pipe-end deformation during ocean transit to African or Southeast Asian ports.
Documentation & Compliance
- Mill test certificate documenting Q345B chemical composition (C, Si, Mn, P, S) and mechanical properties per GB/T 9711 or API 5L as specified
- CE certificate under EN 10210 / EN 10219 for structural spiral welded pipe entering European Union markets
- ISO 9001:2015 quality management system certificate covering SSAW production processes and dimensional inspection
- SGS or BV third-party inspection report available upon request, conducted at our mill before shipment
- Full material traceability by heat number linking each pipe section to its original coil and test results
- Complete customs documentation package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Q345B SSAW spiral welded pipes bundled with steel strips and edge protectors to prevent coating damage and maintain bundle integrity during ocean freight
- Hot-rolled non-oiled surface condition preserved through covered storage and waterproof wrapping for transit humidity protection
- Professional loading plans optimized for 20ft and 40ft containers based on the 219–3000 mm diameter range and 6 m / 12 m standard lengths
- Custom cut lengths available per project specification, with 6.4 m lengths optimized for specific container configurations
- Each pipe marked with heat number, steel grade (Q345B / L245 / L320), outer diameter, wall thickness, and standard designation
- FOB, CIF, and DDP shipping terms supported with professional export documentation handling for ports worldwide
Initiating Your SSAW Pipe Procurement
Submit your project specifications — outer diameter, wall thickness, steel grade, quantity, and destination port — via email or WhatsApp to receive a competitive bulk quotation with volume pricing, mill test certificate confirmation, and estimated production lead time. We will confirm whether your required dimensions are available from ready stock or require custom production, and we can arrange SGS or BV third-party inspection if your project QA framework demands independent verification.
Request Your Q345B SSAW Pipe Quotation
Send your specifications to admin@sdxinjiyuan.com or contact us via WhatsApp at +86 188 5315 7756 to receive pricing, mill test certificate samples, and delivery confirmation for your bulk pipeline order.
Frequently Asked Questions
Q: What steel grades are available for Q345B SSAW spiral welded steel pipe?
A: We produce spiral welded pipe in Q235, Q345, and API 5L grades including L175, L210, L245, and L320. The grade you select depends on your project specification — Q345B is standard for Chinese GB-specification pipelines and structural piling, while API 5L grades serve international oil and gas transmission projects.
Q: Can you provide mill test certificates and third-party inspection for SSAW pipe orders?
A: Yes. Every batch of Q345B SSAW spiral welded steel pipe ships with original mill test certificates documenting chemical composition and mechanical properties by heat number. We also arrange SGS or BV third-party inspection at our mill before loading for projects requiring independent quality verification.
Q: What is the minimum order quantity for large-diameter spiral welded pipe?
A: The MOQ for SSAW spiral welded steel pipe is 5 tons. We support both trial orders for project evaluation and full-container bulk procurement for ongoing pipeline construction programs.
Q: What standards does your SSAW pipe production comply with?
A: Our spiral welded pipe is manufactured to GB/T 9711.1, GB/T 9711.2, SY/T 5037, SY/T 5040, and API 5L standards. We also hold CE certification under EN 10210 and EN 10219 for structural applications in European markets, plus ISO 9001:2015 quality management certification.
Q: How do you handle container loading for large-diameter SSAW pipe?
A: Our export team prepares professional loading plans based on your specific outer diameter, wall thickness, and length requirements to maximize container utilization while preventing pipe-end deformation during ocean transit. We have extensive experience shipping large-diameter spiral welded pipe to ports across Africa, Southeast Asia, the Middle East, and South America.
Secure Factory-Direct Pricing for Your SSAW Pipeline Project
Submit your diameter, wall thickness, grade, and quantity requirements to admin@sdxinjiyuan.com or WhatsApp +86 188 5315 7756 — we respond within 12 hours with bulk pricing, mill test certificate confirmation, and delivery scheduling.
