Description
Factory-Direct ERW Round Steel Pipe — Every Q235 ERW round steel pipe rolls off our own production lines in Jinan, shipped with original mill test certificates and no trading markup.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 ERW Round Steel Pipe |
| Product Type | Round Steel Pipe (ERW Welded) |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR |
| Standard | JIS, API, CE, ISO 9001 |
| Section Shape | Round |
| Outer Diameter | Customization |
| Wall Thickness | Customization |
| Length | 1–12 m (standard 6 m / 6.4 m / 12 m) |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Cold Rolled / Black Painted |
| Tolerance | ±1% |
| Ends | Plain (default) |
| Oiled or Non-oiled | Non-oiled |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Invoicing | By Theoretical Weight |
| Package | Seaworthy Standard Package |
| Sample | Free |
| MOQ | 20 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas Transmission | Low-pressure fluid pipelines, gas distribution lines, chemical fertilizer transport |
| Construction & Infrastructure | Structural columns, scaffolding uprights, piling casings |
| Mechanical Fabrication | Hydraulic cylinder bodies, conveyor roller shells, drill pipe casings |
| Boiler & Pressure Systems | Boiler tube shells, heat exchanger supports |
| Industrial Structures | Warehouse frames, equipment support stands, guardrail posts |
Where Weld Seam Integrity Decides Whether a Container Gets Rejected
A failed bend test on an ERW weld seam can return an entire shipment.
I watched a 38 mm stainless pipe get rejected at SGS复检 in Lagos because the ERW weld hadn’t fused properly — the seam split open during a routine bend test, and the whole container came back at our cost. That kind of failure doesn’t show up in visual inspection. It hides inside the weld line, and it only surfaces when the pipe gets bent, cut, or pressurized on site. For buyers sourcing an ERW round steel pipe supplier, the real risk isn’t the price per ton — it’s the hidden cost of a weld that fails under field conditions. Inconsistent weld quality, unverified steel grade chemistry, and missing mill certificates turn a routine procurement into a customs hold or a structural rework. [NEED_CITE: ERW weld quality inspection methods for structural pipe]
How Q235 and S-Series Grades Match Structural and Fluid Applications
Our Q195–Q345 and S235JR–S355JR ERW round steel pipe covers both Chinese GB and European EN grade systems, letting procurement teams match local engineering specifications without redesign. Q235 remains the default for general structural frames and fluid transport in West African and Southeast Asian markets, while S355JR serves projects requiring higher yield strength under EN 10219 cold-formed hollow section standards. The ±1% dimensional tolerance on outer diameter and wall thickness ensures that cut-to-length pieces fit directly into prefabricated connections without on-site reaming.
Engineering Compliance and Certification Requirements
Structural projects targeting EU markets require CE certification under EN 10210 (hot-finished) or EN 10219 (cold-formed welded hollow sections) — without it, customs clearance fails regardless of price competitiveness. [NEED_CITE: CE marking requirements for structural hollow sections under EN 10219] Our production lines hold both EN 10210 and EN 10219 FPC certification, meaning every Q235 or S355JR batch ships with traceable mill test certificates documenting chemical composition and mechanical properties per heat number. For projects in North America or the Middle East, API and JIS standards apply, and our in-house lab tests every batch against the relevant specification before release.
Understanding ERW Welding and Grade Selection for Round Pipe
ERW (Electric Resistance Welded) pipe forms by passing current through the edges of a steel strip and fusing them under pressure — no filler metal, no flux. This makes ERW the most cost-effective method for round pipe in the 20–600 mm diameter range, with weld seam quality now matching seamless pipe in most structural applications when properly controlled. The Q-series grades (Q195, Q235, Q345) follow China’s GB/T 700 standard, where the number indicates minimum yield strength in MPa; S235JR through S355JR follow EN 10025, with the JR suffix denoting room-temperature impact testing. Cold-rolled surface finish provides a smooth, paint-ready base, while black painted coating offers short-term rust protection during ocean transit. Wall thickness tolerance at ±1% keeps theoretical weight invoicing aligned with actual delivered weight — a detail that matters when a 5% negative tolerance deviation turns a 20-ton order into 19 tons of usable steel. [NEED_CITE: comparison of ERW vs seamless vs SSAW pipe manufacturing processes]
The Hidden Cost of Unverified Material and Missing Certificates
Paying $50 less per ton on unverified pipe becomes expensive fast when the material fails third-party inspection at destination port. A missing mill test certificate means customs holds the container; a wrong steel grade means the structural engineer rejects the entire batch; a weld seam that cracks during bending means re-procurement at double the original lead time. [NEED_CITE: consequences of non-compliant steel imports on project timelines] These costs don’t appear in the quotation — they appear in delay penalties, rework invoices, and lost project milestones.
Why Procurement Teams Choose Xin Jiyuan for ERW Round Pipe
Our Jinan factory runs three simultaneous production lines with monthly capacity exceeding 20,000 tons, meaning your Q235 or S355JR order ships from our own inventory — no trading company markup, no intermediary stock uncertainty. Every batch carries original mill test certificates with heat number traceability, and our in-house metallurgical lab conducts three-stage inspection before release. We hold 2,800+ specifications in ready stock, so standard sizes ship within days while custom lengths and wall thicknesses follow typical production lead times. SGS and BV third-party inspection is available on request, and our export team handles container loading optimization, customs documentation, and port coordination for FOB, CIF, and DDP shipments to 50+ countries.
Documentation & Compliance
- Mill test certificate documenting Q235 chemical composition and mechanical properties per GB/T 700, with heat number traceability for every pipe
- CE certificate covering EN 10219 cold-formed welded hollow sections for EU market structural compliance
- ISO 9001:2015 quality management certificate covering full production and inspection workflow
- SGS or BV third-party inspection report available on request, covering dimensional tolerance, weld seam quality, and surface finish
- Material traceability by heat number linking each pipe to its original slab and rolling batch
- Complete customs documentation package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Q235 and S-series ERW round pipes bundled with steel strips in seaworthy packaging, sized to match 6 m / 6.4 m / 12 m standard lengths for efficient container loading
- Black painted surface protected by end caps and interleaving to prevent coating damage during ocean transit
- Container loading optimized by our export team, combining mixed diameters and wall thicknesses to maximize payload per 20ft or 40ft container
- Cut-to-length service available for 1–12 m custom pieces, with each bundle labeled by heat number, steel grade, and dimensional specification
- Heat number and steel grade stenciled on each pipe end for on-site traceability and inspection verification
- FOB Jinan/Qingdao, CIF destination port, or DDP door-to-door delivery with real-time shipment tracking
Start Your ERW Round Pipe Procurement
Submit your specification list — outer diameter, wall thickness, length, steel grade, quantity, and destination port — and receive a factory-direct quotation with volume pricing, mill test certificate samples, and estimated delivery timeline within 12 hours.
Request Factory-Direct Pricing and Mill Test Certificates
Send your ERW round steel pipe specifications to admin@sdxinjiyuan.com or WhatsApp +86 188 5315 7756 for a detailed quotation with volume discounts and certification documentation.
Frequently Asked Questions
Q: What steel grades are available for ERW round pipes?
A: We supply Q195, Q235, Q345 following Chinese GB standards, and S235JR, S275JR, S355JR following European EN standards. The Q-series and S-series cover overlapping applications, with S-series grades typically specified for EU market projects requiring EN 10219 compliance.
Q: Can you provide mill test certificates and third-party inspection reports?
A: Every batch ships with original mill test certificates documenting chemical composition and mechanical properties by heat number. SGS and BV third-party inspection is available on request for dimensional verification, weld seam testing, and surface finish inspection.
Q: What is the MOQ and can I order custom lengths or wall thicknesses?
A: The MOQ is 20 tons. We offer cut-to-length service for 1–12 m custom lengths and can produce custom outer diameters and wall thicknesses beyond our ready stock range, with typical production lead times for non-standard specifications.
Q: How do you handle surface treatment options?
A: Our standard ERW round pipes come in cold-rolled finish for a smooth, paint-ready surface, or black painted for short-term rust protection during transit. Both options suit structural and fluid transport applications; galvanized coating is available on request for corrosion-prone environments.
Q: What certifications do you hold for EU and international market compliance?
A: We hold CE certification under EN 10210 and EN 10219 for structural hollow sections, ISO 9001:2015 for quality management, and API/JIS compliance for oil, gas, and industrial applications. All certifications are backed by original documentation for customs clearance.
Get Your ERW Round Steel Pipe Quote Today
Email your specifications to admin@sdxinjiyuan.com or message +86 188 5315 7756 on WhatsApp to receive factory-direct pricing, free samples, and mill test certificates within 12 hours.
