Description
Factory-direct ERW pipe mill — Q195 to S355JR grades produced and fabricated under one roof, eliminating third-party material gaps.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235/Q345/S355JR ERW Round Steel Pipe |
| Product Type | ERW Welded Steel Pipe (Round) |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR |
| Standard | API, JIS, ISO 9001, CE |
| Section Shape | Round |
| Size Range | 9 Inch (approx. 219.1 mm) |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Cold Rolled / Black Painted |
| Length | 1–12 m |
| Tolerance | ±1% |
| Ends | Plain / Customizable |
| Application | Fluid transport, Oil & Gas pipelines, Boiler systems, Hydraulic systems, Chemical fertilizer pipelines, Structural frameworks, EMT conduit systems |
| MOQ | 20 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Fluid transport pipelines, chemical fertilizer distribution lines |
| Industrial Manufacturing | Boiler systems, hydraulic cylinder bodies, EMT conduit systems |
| EPC & Infrastructure | Structural frameworks for warehouse frames, platform supports, conveyor structures |
| Construction | Column bracing, scaffolding uprights, building frame members |
What Material Traceability Gaps Cost on an ERW Welded Round Steel Pipe Order
When the mill test certificate cannot be traced back to a specific heat number, customs clearance stalls and structural inspectors reject the batch.
Overseas EPC buyers sourcing ERW welded round steel pipe from fragmented traders often discover — only at site inspection — that the chemical composition report does not match the heat number stamped on the pipe. The trader sourced from three different mills to fill one container. No single MTC covers the full shipment. [NEED_CITE: material traceability requirements for structural steel in EN 10219]
Worse, when welding procedures reference a specific grade equivalence — say S355JR to ASTM A500 Grade B — the absence of a unified certification chain forces the project engineer to halt fit-up and request re-testing. Schedule delays follow.
How 9 Inch ERW Round Pipe Matches Structural and Pressure Applications
The 219.1 mm outer diameter sits at the intersection of structural framing and medium-pressure fluid transport. Cold rolled surface finish delivers dimensional consistency for precision fit-up in EPC structural frameworks, while the ±1% OD tolerance ensures welding prep alignment on boiler and hydraulic system connections. As an ERW welded round steel pipe supplier, we produce this size range across Q235, Q345, and S355JR grades — covering both Chinese domestic projects specifying Q-series and international EPC contracts requiring S-series compliance.
Engineering Compliance and Grade Selection for Round ERW Pipe
Structural frameworks designed to EN 1993 require documented yield strength and impact toughness at specified test temperatures — S355JR provides 27J impact energy at +20°C, making it suitable for indoor and moderate-climate structural members. For Oil & Gas fluid transport, API certification confirms the ERW welded round steel pipe meets pressure containment requirements. Cold rolled finish offers superior surface smoothness for coating adhesion in corrosive environments, while black painted surfaces serve as a cost-effective baseline for non-exposed structural applications. Custom end treatment — plain or beveled — aligns with site welding procedures specified in the project WPS. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerances]
Understanding ERW Process and Steel Grade Equivalence Across Standards
ERW (Electric Resistance Welded) pipe forms the round section by passing steel strip through forming rolls and welding the seam through electrical resistance — no filler metal added. This process suits diameters from 219.1 mm upward with consistent wall thickness and competitive cost versus seamless alternatives at this size range. The Q-series (Q195, Q235, Q345) follows Chinese GB/T standards with yield strength designations, while S-series (S235JR, S275JR, S355JR) follows EN 10025 with equivalent mechanical hierarchy. Specifying S355JR on a project originally designed to ASTM A53 Grade B requires verified grade equivalence documentation — not assumption. Cold rolled surface treatment further refines the as-welded condition, removing mill scale and providing a uniform profile for downstream painting or galvanizing. [NEED_CITE: steel grade equivalence between EN 10025 and GB/T 700 standards]
The Hidden Cost of Sourcing ERW Welded Round Steel Pipe Without Verified Certification
Pipes delivered without heat-level traceability face rejection at third-party inspection — SGS or BV will flag mismatched chemical reports. Negative tolerance exceeding the ±1% specification reduces actual wall thickness below design calculations, triggering structural safety concerns on load-bearing frames. Non-compliant end treatment — plain ends delivered where beveled was specified — forces on-site re-cutting, adding labor cost and delaying welding schedules. [NEED_CITE: dimensional tolerance requirements for structural hollow sections per EN 10219]
Why Project Procurement Teams Source ERW Welded Round Steel Pipe From Our Mill
Our vertically integrated facility operates both the steel production line and the pipe fabrication workshop — meaning the Q235, Q345, and S355JR coils used to form your 9 inch ERW welded round steel pipe originate from our own mill. Every heat number on the MTC traces directly to our production records. We maintain 2,800+ specifications in stock, so standard lengths and custom cut-to-size orders ship from a single quality system. Our certified welding procedures (WPS/PQR) and qualified welders hold AWS and EN certifications, validated through complete documentation packages including weld maps and dimensional inspection reports. Professional loading teams secure oversized 219.1 mm OD pipes with steel banding and timber wedges — I personally oversee every container after learning the hard way that unsecured pipe ends deform during ocean transit.
Documentation & Compliance
- Mill Test Certificate documenting Q235/Q345/S355JR chemical composition and mechanical properties per GB/T and EN standards, with heat number traceability
- CE certificate confirming EN 10219 compliance for structural hollow sections exported to EU markets
- ISO 9001 quality management certificate covering the full production chain from coil to finished ERW welded round steel pipe
- SGS or BV third-party inspection report available upon request, covering dimensional checks, visual weld inspection, and coating thickness
- Material traceability report linking each pipe bundle to its originating heat number and production batch
- Export customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Cold rolled ERW welded round steel pipe bundled with steel strips at intervals preventing bundle separation during crane handling
- Black painted surface protected by edge guards and interleaving separators to prevent coating damage during ocean transit
- 9 inch OD pipes loaded in nested layers with timber wedges and steel band anchoring to prevent end deformation in 20ft and 40ft containers
- Custom length cutting available from 1 m to 12 m per project specification, with cut ends deburred and marked
- Heat number and steel grade stenciled on each pipe end for site identification and inspection traceability
- FOB, CIF, and DDP shipping terms available with full container tracking until site delivery
How to Request a Quotation for Your ERW Welded Round Steel Pipe Project
Submit your project drawings or specification sheet indicating steel grade (Q235, Q345, or S355JR), quantity, length requirements, end treatment preference, and destination port. We respond within 24 hours with a detailed quotation covering material, fabrication, coating, packing, and freight — including shop drawing timeline and production schedule. For projects requiring API or CE certification, confirm the standard at inquiry stage so we attach the correct mill test documentation package.
Start Your ERW Welded Round Steel Pipe Order With Verified Mill Documentation
Share your project specifications, steel grade, and quantity to receive a detailed quotation with full mill test certificate package 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
