Description
Factory-direct ERW welded round pipes — Produced on 3 dedicated lines with in-house physical and chemical laboratories, covering 10–1000 mm OD and wall thickness up to 120 mm without specification gaps.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ERW Welded Round Steel Pipe |
| Product Type | ERW / Welded Steel Pipe (Round) |
| Steel Grade | Q195, Q235A-B, Q345A-E, 20#, 10#, 16Mn, ASTM A36, ASTM A500, ASTM A53, ASTM A106, SS400, St37, St52, S235JR, S355JR, S355TRH, L245, L290, L360, L390, L415, X42, X52, X60, X70 |
| Standard | GB/T 3091, GB/T 13912, BS 1387, ASTM F1083, ASTM A53, ASTM A106, ASTM A500, API 5L, API 5CT, EN 10219, EN 10210, JIS G3452, JIS G3454, DIN 2448, DIN 2391, GOST 8732 |
| Section Shape | Round |
| Outer Diameter | 10–1000 mm |
| Wall Thickness | 1–120 mm |
| Length | 1–12 m (or customized) |
| Technique | Hot Rolled / ERW Welded |
| Surface Treatment | Black Painting / Oiled / Galvanized / Anti-corrosive Oil / Varnished (or as required) |
| Tolerance | ±1% |
| Ends | Plain / Beveled / Threaded / Socket (or as required) |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Application | Fluid transport / Construction pipeline / Structural pipeline / Curtain wall / Machinery parts / Mining industry drainage / Civil engineering drainage |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Civil Engineering | Underground drainage networks, stormwater culverts, foundation piling sleeves |
| Mining Industry | Dewatering pipelines, slurry transport lines, ventilation shaft casings |
| Construction | Greenhouse frames, guardrail posts, curtain wall mullions, scaffolding tubes |
| Infrastructure | Water distribution mains, gas transmission lines, pump well casings |
| Machinery Manufacturing | Hydraulic cylinder barrels, conveyor roller tubes, structural machined parts |
What Wall-Thickness Tolerance Costs on a Large Diameter ERW Welded Round Steel Pipe Order
A ±1% tolerance on 120 mm wall thickness means every meter carries the load it was engineered for — not a theoretical number on a spreadsheet.
When procurement teams source Large Diameter ERW Welded Round Steel Pipe for drainage and structural projects from fragmented suppliers, the risk is not just delayed shipments. Inconsistent wall thickness across batches forces site engineers to over-order as a buffer, inflating material costs. Missing or incomplete mill test certificates trigger customs holds at destination ports, leaving full containers demurrage-accruing on the dock. And when steel grade traceability breaks down between heat number and physical delivery, third-party re-inspection rejects entire batches — the kind of rejection that sends pipes sitting in port heat for weeks. [NEED_CITE: EN 10219 dimensional tolerance requirements for welded hollow sections]
Matching Drainage and Structural Loads with OD-to-Wall Ratio
Large Diameter ERW Welded Round Steel Pipe in the 500–1000 mm OD range with wall thickness from 10 mm to 120 mm handles the hydrostatic pressure of underground drainage mains and the axial load of structural piling sleeves. For mining dewatering lines where abrasive slurry demands thicker walls, the ERW welding process delivers consistent seam integrity across the full length. Our in-house laboratory tests every heat against the specified grade — whether Q345E for low-temperature toughness or API 5L X60 for high-pressure fluid transport — before the pipe leaves the mill floor.
Engineering Compliance Across International Standards
Civil engineering drainage projects in the EU require Large Diameter ERW Welded Round Steel Pipe conforming to EN 10219 or EN 10210, with CE marking validated by a notified body. North American infrastructure specs call for ASTM A53 or ASTM A500 Grade B/C, while Middle East EPC contractors often specify API 5L for oil-field drainage and process piping. Each standard defines different chemical composition limits, tensile requirements, and dimensional tolerances — sourcing from a single mill that produces to all three frameworks eliminates the risk of receiving ASTM-stamped pipe on an EN-spec drawing. [NEED_CITE: steel grade equivalence mapping between EN 10219 and ASTM A500]
Steel Grade Selection and ERW Welding Process
The ERW welding process forms the pipe from hot-rolled coil through continuous forming and high-frequency electric resistance welding, producing a longitudinal seam without filler metal. This makes it cost-effective for large diameter ranges from 10 mm to 1000 mm OD, while maintaining dimensional accuracy that supports structural applications. Steel grades from Q195 and S235JR serve light structural frames and fencing, while Q345 and S355JR provide higher yield strength for load-bearing drainage headers and machinery components. For high-pressure fluid transport, API 5L grades from L245 to X70 deliver the tensile and impact properties required by pipeline operators. Surface treatment selection — galvanized for atmospheric corrosion resistance, black painted with anti-corrosive oil for underground burial, or varnished for indoor structural use — depends on the installation environment and design life of the project.
The Hidden Cost of Unverified Wall Thickness and Missing Certificates
Ordering Large Diameter ERW Welded Round Steel Pipe without verified mill test certificates means the receiving engineer cannot confirm whether the delivered chemistry matches the specified grade. A pipe stamped S355JR that tests below the minimum yield strength at re-inspection fails EN 10219 compliance — and the entire lot must be rejected or downgraded, delaying the project timeline and triggering contractual penalties. Negative tolerance exceeding the allowed ±1% range reduces the actual load-bearing cross-section, creating a structural safety gap that only surfaces during third-party audit or, worse, under service load. [NEED_CITE: consequences of dimensional non-compliance in structural steel hollow sections]
Procurement Confidence from Mill to Port
Every Large Diameter ERW Welded Round Steel Pipe we produce runs through our in-house physical and chemical laboratory for incoming raw material verification, in-process weld seam inspection, and final dimensional checks before bundling. We hold CE certification under EN 10210 and EN 10219, ISO 9001:2015 quality management, and Singapore FPC — documents that clear customs across the EU, Southeast Asia, and Middle East without supplementary testing. With 3 dedicated production lines covering over 2,800 specifications and wall thickness up to 120 mm, we fulfill non-standard OD and WT combinations that typical catalogs leave as “contact for availability.” Our professional loading team optimizes container stowage for large diameter pipes, reducing freight cost per meter and preventing transit damage to surface treatment coatings.
Documentation & Compliance
- Mill Test Certificate documenting Q345B or S355JR chemical composition and mechanical properties per EN 10219, traceable to heat number
- CE Certificate issued under EN 10210 / EN 10219 for structural hollow section compliance in EU markets
- ISO 9001:2015 quality management system certificate covering the full ERW welded pipe production process
- SGS or BV third-party inspection report available upon request before container loading
- Material traceability report linking each pipe bundle to its heat number, chemical analysis, and tensile test results
- Full customs documentation package including packing list, bill of lading, and certificate of origin for destination clearance
Packaging, Loading & Delivery
- Large diameter ERW welded round pipes bundled with galvanized steel strips and edge protectors to preserve black painted or galvanized surface treatment during ocean transit
- Anti-corrosive oil applied to bare ends and inner surface before bundling, preventing rust formation on Q235B and Q345B grades during extended container shipping
- Container loading plan optimized for 10–12 m pipe lengths across 20ft and 40ft units, maximizing weight utilization for thick-wall 500–1000 mm OD pipes
- Custom cutting to project-specific lengths available before bundling, reducing on-site welding and secondary processing for civil engineering drainage installations
- Each bundle marked with heat number, steel grade, outer diameter, wall thickness, and production date for site-level traceability
- FOB, CIF, and DDP shipping options to 50+ countries with real-time container tracking from Jinan port to destination
Getting Your Quotation with Full Technical Documentation
Submit your specification sheet — including outer diameter, wall thickness, steel grade, total tonnage, and destination port — and we respond within 12 hours with unit pricing, production lead time, and the applicable mill test certificate format. For non-standard OD/WT combinations outside the catalog range, our engineering team provides a feasibility assessment and custom production timeline. Confirm your certification requirements (CE, SGS, BV) and surface treatment preference before contract signing to ensure documentation matches destination customs regulations.
Frequently Asked Questions
Q: How do I specify the correct steel grade when my drawing calls for EN 10219 but my local market uses ASTM?
A: We produce Large Diameter ERW Welded Round Steel Pipe to EN 10219, EN 10210, ASTM A53, ASTM A500, API 5L, and GB/T standards on the same production lines. Provide the specification standard from your engineering drawing, and we supply the matching grade with full chemical and mechanical test data — S235JR, S355JR, ASTM A500 Grade B, or Q345B as required.
Q: What documents are included with each shipment for customs and project compliance?
A: Every shipment includes the original Mill Test Certificate traceable to heat number, packing list, bill of lading, and certificate of origin. CE certificates under EN 10210/EN 10219 are provided for EU destinations. Third-party inspection reports from SGS or BV can be arranged before loading upon request.
Q: Can you produce non-standard outer diameter and wall thickness combinations below the 5-ton MOQ?
A: Yes. Our 3 dedicated production lines cover over 2,800 specifications with wall thickness up to 120 mm. For custom OD/WT combinations outside standard ranges, we evaluate feasibility based on tooling availability and provide a tailored production plan with adjusted minimum quantities.
Q: Which surface treatment is appropriate for underground drainage versus above-ground structural use?
A: For underground civil engineering drainage, black painted pipe with anti-corrosive oil or hot-dip galvanized coating provides long-term corrosion resistance in soil environments. For above-ground structural applications such as guardrails and curtain wall mullions, galvanized or varnished finishes maintain appearance and protect against atmospheric exposure. We apply the specified treatment before bundling and loading.
Q: How are large diameter pipes loaded into containers to minimize freight cost?
A: Our loading team designs stowage plans for 20ft and 40ft containers based on the specific OD, wall thickness, and length of your order. Large diameter thick-wall pipes are nested and secured with steel strip bundles and wooden chocks to prevent transit movement and protect surface treatment coatings.
Send Your Specification for Factory-Direct Pricing and Mill Test Certificates
Provide your outer diameter, wall thickness, steel grade, quantity, and destination port — we return a detailed quotation with applicable certifications within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
