Description
Full-Range ERW Pipe from 6mm to 1820mm OD — Every heat number traceable through original mill test certificates covering Q235, S355, and A53 grades.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 S355 ERW Welded Round Steel Pipe |
| Product Type | ERW Welded Round Steel Pipe |
| Steel Grade | Q195, Q235, Q355, 10#, 20#, 45#, 16Mn, A53, A36, ST35, ST52, S355 |
| Standard | API 5L, ASTM A53, ASTM A252, ASTM A671, BS EN10296, BS EN10219, GB/T 3091, GB/T 13793, GB/T 9711 |
| Section Shape | Round |
| Size Range | Outer Diameter 6–1820 mm |
| Wall Thickness | Cold rolled 1–4 mm / Hot rolled 4–20 mm |
| Length | 1–12 m |
| Technique | ERW / Hot Rolled / Cold Rolled / Cold Drawn |
| Surface Treatment | Slightly Oiled |
| Tolerance | ±1% |
| Ends | Plain / Beveled per requirement |
| Application | Fluid transport, Gas pipeline, Oil pipeline, Boiler, Hydraulic systems, Construction, Machinery, Building structures |
| MOQ | 5 Tons |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Fluid transport lines, gas distribution mains, API 5L grade pipeline segments |
| Construction & Infrastructure | Building frames, scaffolding uprights, bridge handrail posts, structural columns |
| Mechanical Engineering | Hydraulic cylinder barrels, conveyor roller tubes, machinery housing frames |
| Energy & Power | Boiler tubes, heat exchanger shells, wind tower base plate anchor bolts |
| Marine & Shipbuilding | Deck drainage pipes, ballast water lines, offshore platform structural members |
Where Thickness Tolerance Decides Whether a Pipeline Order Passes Inspection
A ±1% dimensional tolerance on an ASTM Q235 S355 ERW welded round steel pipe supplier order means the difference between passing third-party inspection and watching a full container sit at the destination port.
Procurement teams sourcing welded round pipe across mixed standards — GB, EN, ASTM — routinely encounter three compounding failures: grade-equivalence confusion where Q235 is shipped against an S275JR specification, missing or non-heat-number-traceable mill test certificates, and wall thickness deviations that exceed negative tolerance limits without disclosure [NEED_CITE: steel grade equivalence mapping between GB, EN, and ASTM systems]. When a bridge contractor in Southeast Asia receives pipe with actual wall thickness 0.8mm below nominal on a 10mm spec, the structural engineer rejects the entire batch — regardless of whether the steel chemistry is correct.
Matching Pipe Dimensions to Structural Load Requirements
An ASTM Q235 S355 ERW welded round steel pipe supplier covering outer diameters from 6mm to 1820mm allows engineers to specify one source for both small-bore hydraulic lines and large-diameter structural columns. The hot-rolled wall thickness range of 4–20mm serves load-bearing structural applications, while the cold-rolled 1–4mm range covers light-gauge framing and conduit work. Processing services including welding, punching, cutting, and bending mean the pipe arrives on-site ready for assembly rather than requiring secondary shop work.
Engineering Compliance and Certification Pathways
Structural projects governed by EN 1993 or AISC specifications require documented proof that the supplied steel grade meets the referenced standard — not merely that it looks similar on paper [NEED_CITE: EN 10219 cold-formed structural hollow section compliance requirements]. For European market entry, CE certification under EN10219 is mandatory; for North American projects, ASTM A53 or A252 compliance with corresponding mill test documentation is the baseline. The slightly oiled surface treatment provides short-term corrosion protection during transit and storage, though long-term exposure in marine or industrial environments requires additional coating specification at the design stage.
Steel Grade Selection and ERW Process Fundamentals
The Q-series (Q195, Q235, Q355) follows the Chinese GB system where the number indicates minimum yield strength in MPa; the S-series (S355) follows EN standards; and the A-series (A53, A36) follows ASTM. An ASTM Q235 S355 ERW welded round steel pipe supplier capable of mapping equivalences across all three systems prevents costly substitution errors. ERW (Electric Resistance Welding) produces a longitudinal weld seam suitable for low-to-medium pressure applications, offering cost advantages over seamless pipe at larger diameters while maintaining consistent wall thickness through the ±1% tolerance band. Hot-rolled pipes in thicker walls (4–20mm) suit structural and pressure applications, while cold-rolled and cold-drawn variants deliver tighter surface finish for precision mechanical uses.
The Hidden Cost of Unverified Pipe Procurement
Pipes supplied without heat-number-traceable mill test certificates may pass visual inspection but fail during hydrostatic testing or structural loading, triggering project delays and re-procurement costs that dwarf the original price difference [NEED_CITE: consequences of missing mill test certificates in international steel procurement]. Negative tolerance abuse — where actual wall thickness falls below the permissible deviation — reduces load capacity and may violate structural engineering codes, exposing the buyer to liability. Customs authorities in the EU and Middle East increasingly reject steel shipments lacking proper CE marking or certificate of origin documentation, stranding cargo at port.
Why Engineering Teams Specify XJY Plate for ERW Pipe
Every ASTM Q235 S355 ERW welded round steel pipe shipment includes an original mill test certificate documenting chemical composition and mechanical properties by heat number — not a template document. The in-house quality lab verifies dimensional compliance before dispatch, issuing inspection reports covering OD, wall thickness, and length against the ±1% tolerance specification. With steel grades spanning Q195 through S355 and 16Mn, and outer diameters from 6mm to 1820mm, a single order covers structural, pressure, and mechanical applications without splitting procurement across multiple suppliers. Professional heavy-cargo logistics experience — including flatbed, open-top container, and break-bulk loading — ensures large-diameter pipes arrive without transit damage or overweight penalties.
Documentation & Compliance
- Mill test certificate documenting Q235, Q355, or S355 chemical composition and mechanical properties per heat number, issued before or with shipment
- CE certificate confirming compliance with EN10219 for structural hollow sections destined for European Union markets
- ISO 9001:2015 quality management system certificate covering the full ERW pipe production and inspection process
- SGS or BV third-party inspection report available upon request for projects requiring independent verification
- Material traceability documentation linking each pipe to its heat number, chemical analysis, and tensile test results
- Export customs documents including packing list, bill of lading, and certificate of origin formatted for destination-country clearance
Packaging, Loading & Delivery
- ERW welded round steel pipes bundled with steel strips and edge protectors, with slightly oiled surface preserved by waterproof wrapping for ocean transit
- Large-diameter pipes (above 600mm OD) loaded on flatbed trailers or open-top containers to avoid crushing deformation during transport
- Cut-to-length pipes between 1–12m prepared per order specification, with bundle weight optimized for standard 20ft and 40ft container payload limits
- Heat number and steel grade (Q235, S355, A53) stenciled on each pipe end for on-site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional break-bulk coordination for project cargo exceeding container capacity
Requesting a Quotation with Full Technical Documentation
Submit your specification including steel grade (Q235, S355, A53, or equivalent), outer diameter, wall thickness, length, quantity, and destination port to receive a detailed quotation within 12 hours — including material cost, any processing fees for cutting or bending, and shipping terms. For projects requiring grade-equivalence confirmation across GB, EN, and ASTM standards, or non-standard dimensions outside the 6–1820mm OD range, the technical team provides mapping and feasibility assessment before contract commitment.
Frequently Asked Questions
Q: How do Q235, S355, and A36 compare across GB, EN, and ASTM standards?
A: Q235 roughly corresponds to S235JR and A36 in yield strength range; Q355 aligns with S355JR/J2. Exact equivalence depends on chemical composition and mechanical property requirements — we provide grade mapping at the quotation stage to confirm suitability for your project specification.
Q: Can I verify the heat number and chemical composition before shipment?
A: Yes. Original mill test certificates documenting chemical composition, yield strength, tensile strength, and elongation per heat number are provided before or with every shipment. Third-party inspection by SGS or BV is available for additional verification.
Q: What is the minimum order for cut-to-length pipe, and can you weld or bend to drawing?
A: The minimum order is 5 Tons. Processing services include welding, punching, cutting, and bending per your drawing specifications. Confirm dimensional requirements at inquiry stage for accurate processing cost inclusion.
Q: Do you charge by theoretical or actual weight, and what is the negative tolerance policy?
A: Weight calculation follows the ±1% tolerance specification stated in our technical parameters. We provide dimensional inspection reports before dispatch so you can verify actual measurements against nominal values.
Q: How are large-diameter pipes loaded for international shipment?
A: Pipes above 600mm outer diameter are loaded on flatbed trailers or open-top containers to prevent deformation. Break-bulk shipping is arranged for project cargo exceeding container capacity, with professional heavy-cargo logistics coordination.
Get Your ASTM Q235 S355 ERW Welded Round Steel Pipe Quote with Mill Test Certificates
Send your specification — steel grade, OD, wall thickness, length, quantity, and destination — to receive pricing and original mill test certificate samples within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjyplate.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
