Description
Factory-Direct SSAW Pipe Supply — Q235 and Q345 spirally submerged arc welded pipes produced on dedicated lines with original mill test certificates for every heat, shipped FOB or CIF to project sites worldwide.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 Q345 SSAW Steel Pipe |
| Product Type | SSAW Spirally Submerged Arc Welding Steel Pipe |
| Steel Grade | Q235, Q345 |
| Standard | GB |
| Section Shape | Round |
| Size Range | OD 10–2620 mm |
| Wall Thickness | 0.5–80 mm |
| Length | 6 m / 12 m (or custom) |
| Technique | SSAW (Spirally Submerged Arc Welding) |
| Surface Treatment | 3PE / 3LPE coating; thread / groove / beveled ends |
| Tolerance | ±1% |
| Ends | Plain / Beveled / Threaded / Grooved |
| Application | Oil & gas transport / Structural support / Fluid pipeline / Chemical fertilizer pipeline |
| MOQ | 25 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Onshore and offshore transmission pipelines, gathering lines, distribution networks |
| Infrastructure & Civil Engineering | Bridge piling, port foundation structures, retaining wall supports |
| Industrial Fluid Transport | Chemical fertilizer pipelines, cooling water systems, process fluid conveyance |
| Structural Support | Heavy-duty column supports, equipment frames, load-bearing foundations |
Why 3PE Coating Thickness Determines Pipeline Lifespan on SSAW Projects
Coating adhesion and thickness consistency decide whether a buried SSAW pipeline lasts 20 years or fails within 5.
I have seen entire container loads of SSAW pipes rejected at destination ports because 3PE coating measured below specification after SGS stripping tests. The root cause is always the same — factories that quote thin coatings to cut costs, then cannot prove adhesion or thickness uniformity along the pipe body. For Q235 Q345 SSAW steel pipe orders destined for oil and gas transmission or underground structural piling, coating integrity is not an optional upgrade. It is the primary barrier against soil corrosion, cathodic disbondment, and premature wall loss. [NEED_CITE: 3PE coating adhesion and thickness requirements per DIN 30670]
Matching Large-Diameter SSAW Pipe to Oil, Gas, and Piling Applications
Spirally submerged arc welding enables outer diameters reaching 2620 mm and wall thicknesses up to 80 mm — dimensions that ERW lines simply cannot produce. This makes Q235 Q345 SSAW steel pipe the practical choice for large-bore oil and gas transmission lines where internal pressure and external soil loads demand thick-wall round sections. The 3PE or 3LPE coating system provides three-layer protection: epoxy primer for adhesion, copolymer adhesive for bonding, and polyethylene outer layer for mechanical and moisture resistance. Beveled or grooved ends allow field welding or mechanical coupling without secondary machining at the job site.
Engineering Compliance and Certification Requirements for SSAW Pipeline Projects
Pipeline projects governed by GB standards require full chemical composition and mechanical property documentation for every heat number. When Q235 Q345 SSAW steel pipe is specified for structural piling or fluid transport, the supplying mill must provide traceable mill test certificates covering yield behavior, tensile performance, and elongation per the applicable GB grade. For projects requiring third-party verification, SGS or BV inspection can be arranged before shipment to confirm coating thickness, adhesion pull-off values, and dimensional tolerance. [NEED_CITE: GB standard requirements for SSAW pipe chemical and mechanical testing] End preparation — plain, beveled, threaded, or grooved — must match the project connection specification to avoid field rework and welding procedure qualification delays.
Understanding Q235 vs Q345 Steel Grades and SSAW Welding Process
Q235 and Q345 represent two tiers of carbon structural steel in the GB system. Q235 offers adequate strength for general structural support, fluid conveyance, and low-pressure pipeline applications where formability and weldability matter more than ultimate load capacity. Q345 provides higher yield strength, making it suitable for pressure-containing pipelines, heavy structural piling, and applications where wall thickness can be reduced while maintaining load-bearing performance. The SSAW process forms the pipe by helically winding steel coil and submerged arc welding both inner and outer seams, producing continuous lengths with uniform wall distribution around the circumference. This spiral seam geometry distributes stress more evenly than a single straight seam under external soil loading, which is why SSAW is preferred for large-diameter buried pipelines. The 3PE coating applied externally adds corrosion resistance without affecting the structural weld integrity, provided coating temperature during application does not exceed the steel substrate tolerance.
Hidden Costs of Specifying the Wrong Coating or Grade on SSAW Pipe Orders
Ordering Q235 when the project structural calculation requires Q345 means the pipe may pass visual inspection but fail load testing — leading to full replacement at the contractor’s expense. Similarly, specifying 3PE coating at a nominal thickness without requiring adhesion test reports risks cathodic disbondment in wet soil conditions, forcing excavation and recoating years before design life. Missing or incomplete mill test certificates cause customs holds at destination ports, delaying project timelines and incurring demurrage charges. [NEED_CITE: consequences of incomplete mill certification on steel pipe customs clearance] Dimensional tolerance beyond ±1% creates fit-up problems during field welding, requiring costly re-beveling or acceptance of compromised joint integrity.
Why Project Buyers Source Q235 Q345 SSAW Steel Pipe From Our Mill
Every batch of Q235 Q345 SSAW steel pipe leaves our facility with original mill test certificates documenting chemical composition and mechanical properties per heat number. Our in-house laboratory conducts three-stage inspection covering dimensional checks, weld seam integrity, and coating thickness measurement before any pipe is released for shipment. We maintain ready stock across standard diameter and wall thickness combinations, enabling urgent dispatch without waiting for full production runs. For projects requiring third-party verification, we coordinate SGS or BV inspection at our facility before container loading. Our export team handles complete documentation packages including packing lists, bills of lading, and certificates of origin, reducing customs clearance friction at destination. We optimize container loading plans for heavy-wall large-diameter pipes to maximize payload per shipment, lowering per-ton freight costs for bulk buyers.
Documentation & Compliance
- Mill test certificate documenting Q235 or Q345 chemical composition and mechanical properties per GB standard, issued per heat number
- 3PE coating thickness and adhesion test report confirming compliance with project specification requirements
- ISO 9001:2015 quality management certificate covering SSAW pipe production and coating application processes
- SGS or BV third-party inspection report available upon request, covering dimensional tolerance, weld quality, and coating integrity
- Material traceability documentation linking each pipe to its heat number, production date, and test results
- Complete customs documentation package including packing list, bill of lading, and certificate of origin for destination port clearance
Packaging, Loading & Delivery
- Q235 Q345 SSAW steel pipe bundled with steel strips and edge protectors to prevent 3PE coating damage during ocean transit
- 3PE coated surfaces wrapped with protective film at pipe ends to maintain coating integrity during handling and storage
- Container loading plans optimized for 6 m and 12 m lengths with diameter-based nesting to maximize payload per shipment
- Custom cut lengths available per project specification, with cut ends protected against corrosion before packing
- Heat number and steel grade marked on each pipe with weather-resistant paint for site identification and traceability
- FOB, CIF, and DDP shipping terms supported with professional export documentation and real-time shipment tracking
Getting Your SSAW Pipe Quote With Full Certification
Submit your project specifications including outer diameter, wall thickness, steel grade, 3PE coating requirements, quantity, and destination port. We respond within 12 hours with competitive bulk pricing, available mill test certificate samples, and confirmed production or stock availability. For non-standard dimensions or custom coating thickness, we provide technical review and lead time confirmation before contract signing.
Frequently Asked Questions
Q: What is the difference between SSAW, LSAW, and ERW pipes for large-diameter pipeline projects?
A: SSAW pipe is formed by helically winding steel coil and welding with submerged arc, enabling outer diameters up to 2620 mm and wall thicknesses up to 80 mm. LSAW uses plate pressed and welded along a straight longitudinal seam, typically for moderate diameters. ERW is limited to smaller diameters and thinner walls. For large-bore oil, gas, and piling applications requiring thick walls, SSAW offers the most practical size range and cost efficiency.
Q: Can 3PE coating thickness be customized per project specification?
A: Yes. We apply 3PE or 3LPE coating per project requirements, with thickness and adhesion tested against applicable standards. Coating test reports are provided with each shipment, and third-party inspection can be arranged to verify compliance before dispatch.
Q: What mill test certificates and third-party inspections are provided with SSAW pipe orders?
A: Every batch ships with original mill test certificates documenting chemical composition and mechanical properties per heat number. SGS or BV third-party inspection is available on request, covering dimensional checks, weld integrity, and coating quality before shipment.
Q: What is the MOQ and can you support mixed-container loading for SSAW pipe?
A: The minimum order quantity is 25 tons. We support mixed-container loading combining different diameters, wall thicknesses, or lengths in a single shipment, with optimized loading plans to maximize container payload.
Q: How do you handle export documentation and container loading for heavy large-diameter pipes?
A: Our export team prepares complete documentation including packing lists, bills of lading, certificates of origin, and mill test certificates. Container loading plans are engineered for heavy-wall large-diameter SSAW pipe to maximize weight utilization while protecting 3PE coating during transit.
Get Your Q235 Q345 SSAW Pipe Quote With Mill Certificates
Send your specifications — diameter, wall thickness, steel grade, coating requirement, quantity, and destination — to receive bulk pricing and certification confirmation within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxinjiyuan.com
Email: admin@sdxinjiyuan.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
