Description
Factory-Direct ERW Pipe Supply — Own steel mill producing Q235 and Q345 grades feeds directly into our ERW welded round steel pipe production line, eliminating third-party material sourcing risks.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235/Q345 ERW Welded Round Steel Pipe |
| Product Type | ERW Welded Steel Pipe |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR, SS400, St37, St52, ASTM A36, ASTM A500, ASTM A53, ASTM A106 |
| Standard | GB/T 3091-2001, GB/T 13912-2002, BS 1387, ASTM F1083, ASTM A53, ASTM A106, ASTM A500 |
| Section Shape | Round |
| Outer Diameter | 10–1000 mm |
| Wall Thickness | 1–80 mm |
| Length | 1–12 m (6 m / 6.4 m / 12 m / customized) |
| Technique | ERW / Hot Rolled |
| Surface Treatment | Hot Rolled / Oiled / Non-oiled / Consumer’s Requirement |
| Tolerance | ±1% |
| Ends | Plain / Beveled (as required) |
| Application | Fluid delivery, construction, structural, curtain wall, machinery, chemical fertilizer, oil, hydraulic, drill pipe, boiler pipe |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Structural columns, scaffolding tubes, curtain wall support frames, fence posts |
| Industrial & Energy | Water and gas fluid transport, boiler tubes, hydraulic systems, oil pipeline components |
| Agricultural & Commercial | Greenhouse structure frames, machinery parts, pump well casing |
Where Material Traceability Gaps Cause Customs Rejection on ERW Welded Round Steel Pipe Orders
A missing heat number on a mill certificate can hold an entire container at the destination port.
When procurement teams source welded round steel pipes from overseas fabricators who buy raw material from third-party mills, the certification chain breaks at the weakest link. I once watched a shipment of spiral pipes get held at Jebel Ali because the mill cert showed compliant chemistry, but a third-party re-inspection at the destination found manganese content below the specified grade threshold. The entire container sat in port for weeks. For ERW welded round steel pipe projects requiring EN 10204 3.1 or 3.2 certificates, this traceability gap between raw material supplier and fabricator is the single most common cause of customs delays and project schedule overruns. [NEED_CITE: EN 10204 inspection document types for steel products]
How OD 10–1000 mm Range Matches Structural and Fluid Transport Engineering
An ERW welded round steel pipe spanning 10 mm to 1000 mm outer diameter covers everything from greenhouse framing and fence posts to large-bore fluid transport and structural columns. The ±1% dimensional tolerance ensures that connection details — whether bolted flanges, welded joints, or sleeve connections — fit without on-site rework. For EPC projects sourcing Q235 or Q345 grade pipes, having the full diameter range from a single production source means consistent welding procedures, uniform surface treatment, and one quality system across every pipe size on the bill of materials.
Engineering Compliance Requirements for Round ERW Pipe in Global Projects
Structural applications demand compliance with EN 1090, AISC, or local building codes depending on the destination market. Fluid transport pipes carrying water, gas, or oil must meet pressure-rated standards such as ASTM A53 or ASTM A106, where wall thickness tolerance directly affects pressure containment calculations. For European projects, CE marking under EN 10219 requires full factory production control documentation and traceable material certificates. [NEED_CITE: EN 10219 cold-formed welded structural hollow sections requirements] Surface treatment selection — oiled for temporary corrosion protection during transit, hot rolled for industrial environments, or customized coatings for aggressive chemical exposure — must align with the end-use environment and project specification.
Understanding Steel Grade Selection and ERW Process for Round Pipe
The Q-series grades (Q195, Q235, Q345) follow the Chinese GB standard system where the number indicates minimum yield strength in MPa. Their European equivalents S235JR, S275JR, and S355JR follow EN standards, while ASTM A36, A53, and A500 serve the North American market. [NEED_CITE: steel grade equivalence between GB, EN, and ASTM standards] ERW (Electric Resistance Welding) process creates a longitudinal weld seam by passing high-frequency current through the steel strip edges, producing a pipe with consistent wall thickness and smooth internal surface — making it suitable for both structural applications and fluid transport. Hot rolled ERW pipes offer tighter dimensional control compared to cold-formed alternatives, while the oiled surface treatment provides short-term rust prevention during ocean freight without affecting subsequent painting or coating adhesion.
Hidden Costs of Procuring ERW Welded Round Steel Pipe Without Verified Certification
Choosing the lowest unit price on an ERW welded round steel pipe order often means accepting material from unverified third-party mills. When the mill test certificate cannot be traced back to a specific heat number, or when wall thickness falls outside the ±1% tolerance, the consequences extend far beyond the invoice. Engineering inspectors may reject the entire batch during structural acceptance testing. Customs authorities in the EU and Middle East routinely hold shipments lacking proper EN 10204 3.1 documentation. [NEED_CITE: customs clearance requirements for structural steel imports] Re-work, replacement shipping, and project delays cost multiples of the original price difference between verified and unverified suppliers.
Why Project Teams Source ERW Welded Round Steel Pipe From Our Integrated Facility
Our production model starts with our own steel mill producing Q235, Q345, and international equivalent grades, then feeds directly into the ERW pipe welding line. This vertical integration means every heat of steel is traceable from raw slab to finished pipe — no third-party material sourcing, no certification gaps. Our in-house理化 laboratory performs chemical composition analysis and mechanical testing before any pipe leaves the facility. We maintain over 2,800 specifications in inventory, covering the full OD 10–1000 mm and WT 1–80 mm range, so project teams sourcing multiple pipe sizes receive consistent quality from one production system. Certified welding procedures (WPS/PQR) and qualified welders per AWS and EN standards ensure every weld seam meets international code requirements. We accept third-party inspection from SGS, BV, and TUV for pre-shipment verification, and provide complete quality documentation packages including dimensional inspection reports, coating reports, and material traceability records.
Documentation & Compliance
- Mill Test Certificate documenting Q235 and Q345 chemical composition and mechanical properties per GB/T 3091-2001 and EN 10204 3.1 format
- CE certificate confirming EN 10219 compliance for structural hollow sections exported to European Union markets
- ISO 9001 quality management system certificate covering the full production process from steelmaking to ERW pipe fabrication
- SGS or BV third-party inspection report available for pre-shipment verification of wall thickness, outer diameter, and weld seam quality
- Complete material traceability by heat number from our own steel mill through to finished ERW welded round steel pipe
- Full customs documentation package including packing list, bill of lading, and certificate of origin for destination port clearance
Packaging, Loading & Delivery
- ERW welded round steel pipes bundled with steel strips and edge protectors to prevent surface damage to oiled or hot rolled finishes during ocean transit
- Oiled surface treatment pipes wrapped with waterproof paper and plastic film to preserve corrosion protection through humid shipping conditions
- Container loading optimized for 6 m and 12 m standard lengths, with nested smaller diameter pipes (10–200 mm OD) inside larger pipes to maximize container utilization
- Custom cut-to-length service available for 1–12 m requirements, with cut ends deburred and protected against rust
- Each bundle marked with heat number, steel grade (Q235/Q345/S355JR), outer diameter, wall thickness, and production date for site identification
- FOB Qingdao, Tianjin, or Shanghai port with CIF and DDP delivery options available for project sites across the Middle East, Southeast Asia, Europe, and Africa
How to Request a Quotation for Your ERW Welded Round Steel Pipe Requirement
Submit your project drawings or specification sheet indicating steel grade, outer diameter, wall thickness, length, surface treatment, and destination port. We respond within 24 hours with a detailed quotation including material cost, fabrication, surface treatment, packing, and shipping terms, along with the mill test certificate format and production schedule. For non-standard dimensions or large-volume project orders, our engineering team provides shop drawing review and material optimization recommendations before contract signing.
Request Your ERW Welded Round Steel Pipe Quote with Mill Test Certificate
Send your specification sheet including steel grade, OD, WT, length, and destination port to receive a detailed quotation and sample mill test certificate within 24 hours.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
