Description
Factory-Direct ERW Round Pipe Supply — XJY Structure operates its own steel mill with 3 production lines, delivering Carbon Steel ERW Round Pipe directly from slab to finished product without trading intermediaries.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Carbon Steel ERW Round Steel Pipe |
| Product Type | ERW Welded Steel Pipe (Round) |
| Steel Grade | Q195, Q235, Q345 (Q355), 10#, 20#, 45#, 16Mn, A53, A106, ST35, ST52 |
| Standard | API 5L, ASTM A53, ASTM A106, ASTM A252, ASTM A671, ASME B36.10M, BS EN10219, BS EN10296, BS 1387, BS 6323, BS 6363, GB/T 3091, GB/T 9711, GB/T 8163 |
| Section Shape | Round |
| Size Range | Outer Diameter 10–700 mm |
| Wall Thickness | Cold rolled 1–4.0 mm / Hot rolled 4–20 mm |
| Length | 1–12 m |
| Technique | ERW / Hot Rolled / Cold Rolled / Cold Drawn |
| Surface Treatment | Oiled / Non-oiled / Black |
| Tolerance | ±1% |
| Ends | Plain / Beveled (per standard) |
| Application | Fluid transport / Structural support / Construction / Scaffolding / Machinery / Industrial piping |
| MOQ | 28 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Structural columns, scaffolding systems, piling supports, building frames |
| Industrial Piping | Water supply networks, gas distribution, oil transport pipelines |
| EPC Projects | Certified material supply for turnkey plant construction, modular fabrication |
| Machinery Manufacturing | Hydraulic cylinders, conveyor rollers, equipment frames |
| General Contracting | Warehouse structures, commercial building frameworks, bridge supports |
Where Wall-Thickness Tolerance Decides Structural Acceptance
A ±1% tolerance on Carbon Steel ERW Round Pipe means the difference between passing third-party inspection and facing full-batch rejection at destination port.
Overseas buyers sourcing ERW pipes from trading companies frequently encounter material certification gaps and inconsistent welding quality. When wall thickness deviates beyond acceptable limits, the entire shipment faces rejection — triggering re-shipping costs, project delays, and structural safety concerns. XJY Structure addresses this through vertically integrated production: our own steel mill produces raw material, our fabrication workshop welds and finishes the pipe, and our quality team documents every heat number from slab to finished product. This eliminates the traceability gap that occurs when fabricators source steel from third-party suppliers. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
Matching Carbon Steel ERW Round Pipe to Structural and Fluid Transport Applications
Carbon Steel ERW Round Pipe in OD 10–700 mm covers both thin-wall cold-rolled sections (1–4.0 mm) for scaffolding and machinery frames, and thick-wall hot-rolled pipes (4–20 mm) for pressure-containing fluid transport and structural columns. The ERW welding process, when executed with certified WPS/PQR procedures and in-process NDT testing, produces weld seams suitable for structural loading and moderate-pressure fluid conveyance. Steel grades Q195 and Q235 serve general construction and scaffolding, while Q345/Q355 and pipeline-grade API 5L materials meet higher strength requirements for industrial piping and EPC projects. Our integrated mill-to-pipe production ensures that every Carbon Steel ERW Round Pipe carries full material traceability, supporting customs clearance and engineering approval across EU, Middle East, and Southeast Asian markets.
Engineering Compliance and Certification Requirements for ERW Round Pipe
Structural applications require compliance with EN 10219 (cold-formed welded structural hollow sections) or ASTM A500/A53 (North American structural and standard pipe), while fluid transport systems demand API 5L or ASTM A106 certification for pressure-containing service. The choice between Q235 (Chinese standard), S235JR (EN standard), and A36 (ASTM) depends on destination market regulations and engineering specifications — these grades are chemically and mechanically equivalent but require proper documentation for customs acceptance. [NEED_CITE: steel grade equivalence between EN 10025 and ASTM A36 standards] Surface treatment selection — oiled for temporary corrosion protection during transit, black for indoor structural use, or galvanized/3PE coated for outdoor or buried applications — must align with the project’s corrosion environment and design life. Custom length cutting (1–12 m) and end preparation (plain or beveled per project specification) reduce on-site secondary processing and welding preparation time.
Understanding Steel Grade Selection and ERW Welding Process for Round Pipe
The Q-series (Q195, Q235, Q345) represents Chinese standard carbon steel grades where the number indicates minimum yield strength in MPa — Q235 provides general structural capacity, while Q345/Q355 offers higher strength for load-bearing columns and industrial frameworks. The S-series (S235JR, S275JR, S355JR) follows EN 10025 European standards with equivalent mechanical properties but different chemical composition limits and impact testing requirements for low-temperature service. ASTM A53 and A106 cover standard and seamless carbon steel pipe for high-temperature service, while API 5L specifies line pipe for oil and gas transmission with stringent weld seam quality requirements. The ERW (Electric Resistance Welding) process forms round pipe from steel coil by cold-forming and welding the longitudinal seam using electrical resistance heat — this method produces consistent wall thickness and smooth internal surfaces suitable for fluid transport, with production efficiency superior to seamless pipe for diameters below 610 mm. [NEED_CITE: ERW vs seamless steel pipe manufacturing process comparison] Wall thickness tolerance of ±1% ensures dimensional consistency across the production batch, preventing the negative tolerance issues that cause theoretical weight discrepancies and structural capacity shortfalls.
Hidden Costs of Incorrect Steel Grade or Missing Certification on ERW Pipe Orders
Ordering Carbon Steel ERW Round Pipe without verified material certification creates cascading project risks: customs authorities in EU markets demand EN 10219 compliance documentation, while Middle East and Southeast Asian EPC projects require third-party inspection reports (SGS, BV, TÜV) confirming chemical composition and mechanical properties. When steel grade documentation is incomplete or material traceability cannot be verified by heat number, the entire shipment faces rejection at destination port — triggering re-shipping costs, project schedule delays, and potential structural safety liabilities if non-conforming material enters service. [NEED_CITE: EN 10204 inspection certificate types 3.1 and 3.2 requirements] Negative tolerance exceeding acceptable limits reduces actual wall thickness below design specifications, compromising structural load capacity and creating safety hazards in load-bearing applications.
Why Project Procurement Teams Source Carbon Steel ERW Round Pipe from XJY Structure
XJY Structure operates as a vertically integrated manufacturer: our own steel mill produces raw steel coil and plate across 3 production lines with 2,800+ material specifications, while our fabrication workshop performs ERW welding, cutting, and finishing — this eliminates the quality gap between material supplier and pipe producer that occurs when fabricators source steel from third parties. Every Carbon Steel ERW Round Pipe undergoes in-process dimensional inspection, NDT testing of weld seams per certified WPS/PQR procedures, and surface treatment verification before shipment. Our engineering team provides shop drawing review and material optimization support, ensuring that steel grade selection and wall thickness specifications align with project structural requirements and international standards (EN 10219, ASTM A53, API 5L). Complete quality documentation packages — including Mill Test Certificates with heat-to-piece traceability, weld maps, dimensional inspection reports, and coating certificates — support customs clearance and engineering approval across EU, Middle East, Southeast Asia, and African markets. Professional loading and shipping planning handles oversized cargo and ensures proper lashing for ocean transit, reducing damage risk during international delivery.
Documentation & Compliance
- Mill Test Certificate (EN 10204 3.1/3.2) documenting Q235/Q345 chemical composition and mechanical properties per GB/T 9711 or EN 10219
- CE certificate confirming EN 10219 compliance for structural hollow sections exported to European Union markets
- ISO 9001 quality management system certification covering the entire production process from raw material procurement to finished pipe delivery
- SGS or BV third-party inspection report verifying dimensional accuracy, weld seam quality, and surface treatment for EPC project requirements
- Full material traceability by heat number linking each Carbon Steel ERW Round Pipe to its original steel coil or plate certification
- Complete export documentation package including packing list, bill of lading, certificate of origin, and customs clearance support
Packaging, Loading & Delivery
- Carbon Steel ERW Round Pipe bundled with steel strips and edge protectors to prevent surface damage during ocean transit, with bundle weight optimized for container or bulk vessel loading
- Oiled surface treatment applied to non-galvanized pipes to prevent rust formation during storage and international shipping
- Custom length cutting (1–12 m) performed per project specification to reduce on-site waste and secondary processing
- Heat number and steel grade marked on each pipe end for material traceability verification at destination
- Professional loading plans developed for oversized diameter pipes (400–700 mm OD) to maximize container utilization and ensure proper lashing
- FOB, CIF, and DDP shipping terms available with door-to-door logistics coordination for project sites across Middle East, Southeast Asia, and Africa
Initiating Your Carbon Steel ERW Round Pipe Procurement
Submit your project specifications — including outer diameter, wall thickness, steel grade, quantity, and destination port — to receive a detailed quotation with production schedule and Mill Test Certificate documentation. Our engineering team will review your requirements and confirm compliance with applicable standards (EN 10219, ASTM A53, API 5L) before production begins. For custom length cutting or special surface treatment requirements, we provide technical consultation to optimize material selection and reduce project costs.
Request Quotation and Material Certification for Carbon Steel ERW Round Pipe
Contact our technical sales team with your project drawings and specifications to receive a comprehensive quotation including material cost, fabrication charges, surface treatment, and international shipping. We respond within 24 hours with preliminary assessment and production timeline.
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
