Description
Factory-direct SSAW supply — Q235 and Q345 spiral welded pipes produced on our own lines with full mill test traceability and third-party inspection support for pipeline and structural projects.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 Q345 SSAW Steel Pipe |
| Product Type | SSAW Steel Pipe / Spiral Submerged Arc Welded Steel Pipe |
| Steel Grade | Q235, Q345 |
| Standard | GB 5310-1995; API referenced |
| Section Shape | Round |
| Size Range (OD) | 10–2620 mm |
| Wall Thickness | 0.5–80 mm |
| Length | 6 m / 12 m (custom available) |
| Technique | SSAW (Spirally Submerged Arc Welded) |
| Surface Treatment | Hot Rolled / Oiled / Non-oiled; optional thread, groove, beveled ends |
| Tolerance | ±1% |
| Ends | Plain / Beveled / Threaded / Grooved |
| Application | Structural use / Construction frames / Engineering support / Mechanical processing / Bridge / Mining / Fluid transport |
| MOQ | 25 Tons |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, bridge piling, industrial platform supports, scaffolding structures |
| Pipeline & Fluid Transport | Water transmission mains, gas distribution lines, low-pressure media conveyance |
| Mining & Engineering | Mine ventilation shafts, slurry transport, equipment base supports, conveyor structures |
| Steel Structure Fabrication | Column members, truss chords, purlin systems, heavy-duty load-bearing frames |
What Diameter Range Gaps Cost on Large-Scale Pipeline Orders
Sourcing SSAW pipe beyond 1200mm OD from traders often means specification compromises or months of waiting.
When project engineers specify large-diameter Q235 Q345 SSAW steel pipe for water mains or piling applications, most stockholders can only cover up to 800mm or 1000mm OD. Beyond that, buyers face either switching to more expensive seamless alternatives or accepting long lead times from mills that do not specialize in spiral welding. Wall thickness availability above 25mm becomes another bottleneck — many suppliers quote thinner walls that cannot meet structural load requirements for deep-burial or high-pressure conditions. [NEED_CITE: large-diameter SSAW pipe manufacturing capabilities and OD/Wall thickness ranges]
How OD 10–2620mm Coverage Matches Structural and Pipeline Engineering
Large-diameter SSAW pipe in Q235 and Q345 grades serves two distinct engineering demands simultaneously. For structural piling and bridge substructures, wall thickness up to 80mm provides the section modulus needed for heavy axial loads, while the spiral weld seam distributes stress more evenly than longitudinal seams under bending moments. For fluid transport applications, the same Q235 Q345 SSAW steel pipe in thinner walls (6–16mm) offers cost-effective coverage for water and low-pressure gas lines where corrosion protection can be applied externally. Our production lines cover the full 10–2620mm OD range without requiring buyers to split orders across multiple suppliers.
Engineering Compliance and Certification for SSAW Pipe in Regulated Markets
Structural applications in Europe and North America require compliance with dimensional tolerances and material traceability that go beyond basic mill certificates. The ±1% tolerance on OD and wall thickness ensures that Q235 Q345 SSAW steel pipe meets fit-up requirements for welded connections and flange assemblies. For projects requiring CE marking under EN 10210 or EN 10219, our factory holds Lloyd’s CE certification and can provide Factory Production Control documentation specific to spiral welded products. Third-party inspection by SGS or BV before shipment verifies chemical composition, mechanical properties, and weld seam integrity against purchase order specifications. [NEED_CITE: EN 10210 hot-formed structural hollow section requirements for spiral welded alternatives]
Understanding Q235 and Q345 Grades in the SSAW Manufacturing Context
Q235 and Q345 represent the two most widely specified carbon structural steel grades in Chinese standards, with Q345 offering higher yield strength for load-bearing applications. In the SSAW process, steel coil is formed into a spiral configuration and submerged arc welded along both inner and outer seams — this method allows production of large diameters (up to 2620mm) that would be impossible with seamless or ERW processes. The spiral weld pattern also provides inherent advantages for certain applications: the helical seam distributes residual stresses more uniformly, and the double-sided welding ensures full penetration for pressure-containing service. Surface treatment options include oiled (for temporary corrosion protection during transit), hot-rolled (mill scale retained for painted applications), or non-oiled (for immediate galvanizing or coating). End finishing — plain, beveled, threaded, or grooved — is selected based on the connection method specified in the project design.
Hidden Costs of Incorrect Grade Selection and Missing Documentation
Ordering Q235 when the structural calculation requires Q345 may seem like a cost saving at the purchase stage, but it creates downstream failures: rejected inspection reports, re-engineering delays, or in worst cases, structural under-performance under load. Conversely, specifying Q345 for non-critical applications wastes budget on unnecessary strength. Missing or incomplete mill test certificates — particularly those lacking heat number traceability or third-party verification — can block customs clearance in regulated markets and delay project timelines by weeks. [NEED_CITE: steel grade equivalence between GB Q235/Q345 and international standards]
Why Procurement Teams Choose Our SSAW Line for Large-Diameter Projects
Our factory operates dedicated SSAW production lines covering the full 10–2620mm OD and 0.5–80mm wall thickness range in Q235 and Q345 grades, eliminating the need to source from traders who cannot verify mill origin. Every Q235 Q345 SSAW steel pipe order is supported by in-house physical and chemical laboratory testing, with mill test certificates issued per heat number showing actual chemical composition and mechanical test results. We hold ISO 9001:2015, Lloyd’s CE (EN 10210/10219), and Singapore FPC certifications, and arrange SGS or BV third-party inspection on request. Custom lengths, end finishing, and non-standard dimensions are available with low MOQ flexibility. For export shipments, our loading team uses purpose-built support frames for large-diameter pipe to prevent ovalization and surface damage during ocean transit — a lesson learned from years of serving Latin American and Middle Eastern infrastructure projects.
Documentation & Compliance
- Mill test certificate documenting Q235 or Q345 chemical composition (C, Mn, Si, S, P) and mechanical properties (yield strength, tensile strength, elongation) per heat number
- CE certificate under EN 10210/EN 10219 for structural hollow sections, with Factory Production Control documentation for spiral welded pipe
- ISO 9001:2015 quality management system certificate covering SSAW pipe production, inspection, and testing processes
- SGS or BV third-party inspection report verifying dimensional accuracy, weld seam quality, and material compliance before shipment
- Material traceability report linking each pipe to its heat number, coil origin, and production date for project audit requirements
- Export customs documentation including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Q235 Q345 SSAW steel pipe bundled with steel strips and edge protectors, with bundle weight optimized for 20ft or 40ft container loading based on OD and wall thickness
- Oiled surface treatment applied before bundling to prevent rust during ocean transit, with plastic wrapping available for additional moisture protection
- Large-diameter pipe (OD above 1200mm) loaded with dedicated steel cradles and wooden chocks to prevent ovalization and rolling damage during container stuffing
- Custom cutting to project-specified lengths (6m, 12m, or non-standard) with beveled, threaded, or grooved ends prepared per drawing requirements
- Heat number and steel grade stenciled on each pipe end, with bundle tags showing PO number, specification, and gross/net weight for site identification
- FOB, CIF, and DDP shipping terms available, with professional container loading plans provided before shipment to maximize payload and minimize freight cost
Start Your SSAW Pipe Inquiry with Specification Details
Submit your required OD, wall thickness, length, steel grade (Q235 or Q345), quantity, and destination port to receive a detailed quotation including unit price, production lead time, and shipping terms. We will provide mill test certificate samples and third-party inspection options for your review before contract confirmation. For non-standard dimensions or custom end finishing, our technical team will confirm feasibility and tooling requirements within one working day.
Frequently Asked Questions
Q: Can Q235 and Q345 SSAW pipe be supplied with ASTM or EN equivalent grade certification?
A: Yes. We provide grade equivalence documentation mapping Q235 to ASTM A252 Grade 2 or EN 10219 S235JR, and Q345 to ASTM A252 Grade 3 or EN 10219 S355JR. Mill test certificates can be issued to the international standard specified in your purchase order.
Q: What is the maximum wall thickness available for large-diameter SSAW pipe?
A: Our SSAW lines produce wall thickness up to 80mm for OD up to 2620mm. For heavy-wall structural piling or high-pressure pipeline applications, we recommend confirming the specific OD/Wall combination with our technical team to verify production feasibility.
Q: Can third-party inspection be arranged before shipment?
A: Yes. SGS and BV inspection services are available on request. The inspection covers dimensional verification, visual weld seam examination, and witness testing for mechanical properties and chemical composition. Inspection reports are issued before container loading.
Q: How are large-diameter SSAW pipes protected during ocean shipping?
A: Pipe above 1200mm OD is loaded with steel cradle supports and wooden chocks inside the container to prevent ovalization. Oiled surface treatment and plastic wrapping provide corrosion protection. Loading plans are shared with the buyer before stuffing to confirm the arrangement.
Q: What end finishing options are available for SSAW pipe?
A: Plain ends (for field welding), beveled ends (for butt-welded connections per API or ASME standards), threaded ends (for mechanical coupling), and grooved ends (for Victaulic-type couplings) are all available. Surface treatment can be combined with any end finish.
Request Your Q235 Q345 SSAW Steel Pipe Quotation Today
Send your specification sheet — OD, wall thickness, length, grade, quantity, and destination — to receive pricing, mill test certificate samples, and production lead time confirmation.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjypipe.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
