Description
Factory-Direct ERW Pipe — Every Q235/Q345 ERW welded round steel pipe rolls off our own lines with in-house lab verification, eliminating middleman markups and quality gaps.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235/Q345 ERW Welded Round Steel Pipe |
| Product Type | ERW Welded Round Steel Pipe |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR, SS400, St37, St52, ASTM A36, ASTM A53, ASTM A106, ASTM A500, 20#, 10#, 16Mn |
| Standard | GB/T 3091-2001, GB/T 13912-2002, BS 1387, ASTM F1083, ASTM A53, ASTM A106, ASTM A500, JIS G3466 |
| Section Shape | Round |
| Size Range | OD 10–1000 mm |
| Wall Thickness | 1–80 mm |
| Length | 1–12 m (6 m, 6.4 m, 12 m available; customized acceptable) |
| Technique | ERW / Hot Rolled |
| Surface Treatment | Hot Rolled / Oiled / Non-oiled / Consumer’s Requirement |
| Tolerance | ±1% |
| Ends | Plain / Beveled / Threaded |
| Application | Fluid transport, construction, structural, machinery, boiler, hydraulic |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors & Construction | Structural frames, curtain wall supports, scaffolding uprights, pile driving casings |
| Machinery Manufacturers | Hydraulic cylinders, drill pipe casings, conveyor roller tubes, precision machined shafts |
| Infrastructure & Utilities | Water and gas distribution mains, pump well casings, irrigation networks |
| Industrial & Agricultural | Greenhouse arches, fence posts, chemical fertilizer transport lines, boiler feed tubes |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
A ±1% tolerance on an ERW welded round steel pipe means the difference between passing third-party inspection and an entire container held at port.
Global buyers repeatedly face mill certificates that look clean on paper but fail ultrasonic re-check at destination. When wall thickness drifts beyond allowable negative tolerance, structural load calculations collapse, customs officers flag missing EN or ASTM compliance, and project timelines slip. Fragmented sourcing across multiple vendors compounds the problem — pipes arrive with mismatched heat numbers, inconsistent surface treatment, and no unified traceability chain. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed welded hollow sections]
Matching OD and Wall Thickness to Structural Load Paths
An ERW welded round steel pipe with OD up to 1000 mm and WT up to 80 mm covers load-bearing columns, fluid mains, and machinery casings in a single procurement cycle. The ERW process produces a longitudinal weld seam suitable for moderate-pressure fluid conveyance and structural framing where seamless alternatives would add unnecessary cost. For EPC contractors coordinating multi-discipline projects, sourcing Q235 through S355JR grades from one production base eliminates cross-vendor specification gaps and simplifies on-site welding procedure qualifications.
Engineering Compliance and Certification Requirements
Structural applications demand compliance with EN 1993 for steel structures or AISC specifications for North American projects, which in turn require verified mill test certificates and recognized quality management systems. Our CE certification under EN 10210 and EN 10219 covers hot-finished and cold-formed welded hollow sections for EU market entry, while ASTM A53 and A500 grades satisfy North American structural and mechanical requirements. [NEED_CITE: steel grade equivalence mapping between GB, EN, and ASTM standards] Custom cut-to-length services reduce on-site welding and secondary machining, while beveled or threaded ends accelerate field connections for pipeline and piling operations.
Steel Grade Selection and ERW Process Fundamentals
The Q-series (Q195, Q235, Q345) follows the Chinese GB standard system where the number indicates minimum yield strength in MPa, directly mapping to S-series grades (S235JR, S275JR, S355JR) under EN standards and ASTM A36/A500 under US specifications. ERW welding forms the pipe by rolling steel strip into a cylindrical shape and applying high-frequency electric current to fuse the seam, producing a cost-effective alternative to seamless pipe for non-critical pressure applications. Hot-rolled surface treatment removes mill scale and provides a clean base for downstream coating, while oiled finishes protect against transit corrosion without affecting weldability. Wall thickness tolerance of ±1% ensures that theoretical weight calculations align with actual delivered mass, preventing disputes over invoicing by actual weight.
Hidden Costs of Incorrect Grade or Missing Certification
Procuring Q345 pipe that fails to meet the specified yield strength range forces redesign or replacement after delivery, multiplying logistics costs and delaying project handover. Missing CE or ASTM certification triggers customs holds at destination ports, generating demurrage charges that often exceed the pipe value itself. [NEED_CITE: customs clearance requirements for structural steel products in EU and North American markets] Third-party inspection rejection due to inconsistent wall thickness or undocumented heat numbers means the entire shipment may require re-export or scrapping, with no recovery path for time-sensitive construction schedules.
Procurement Confidence Through Vertical Integration
Every ERW welded round steel pipe undergoes incoming raw material inspection, in-process weld seam monitoring, and final dimensional verification in our physical and chemical laboratories before release. Mill test certificates document chemical composition and mechanical properties per heat number, providing full traceability from coil to finished pipe. Our three dedicated production lines cover over 2800 specifications including non-standard OD and WT combinations, while 41 patented technologies address specialized requirements such as sharp-corner rectangular tubes for architectural applications. CE, ISO 9001, Lloyd’s Register, Singapore FPC, and SGS/BV third-party verification ensure compliance across EU, North American, Middle Eastern, and Asian markets. Professional container loading plans optimize weight distribution for 12 m lengths, and door-to-door logistics coordination handles FOB, CIF, and DDP terms across 50+ countries.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and mechanical properties per GB/T 3091 or equivalent EN/ASTM standard, issued per heat number
- CE certificate covering EN 10210 hot-finished and EN 10219 cold-formed welded hollow sections for EU structural compliance
- ISO 9001:2015 quality management system certificate validating production process controls and inspection protocols
- SGS or BV third-party inspection report available upon request for destination-port re-verification
- Material traceability report linking each pipe to coil heat number, production date, and test results
- Customs documentation package including packing list, bill of lading, and certificate of origin for destination clearance
Packaging, Loading & Delivery
- ERW welded round steel pipes bundled with steel strips and edge protectors to prevent surface damage during ocean transit, with bundle weight optimized for container payload limits
- Oiled surface treatment applied to non-galvanized pipes to inhibit rust formation during extended shipping periods to Southeast Asia, Middle East, and South America
- Custom cut-to-length service available for 6 m, 6.4 m, and 12 m standard lengths, with non-standard lengths produced to reduce on-site cutting waste for EPC projects
- Heat number and steel grade stenciled on each pipe end for on-site identification and traceability verification during installation
- Container loading plans optimized by our logistics team to maximize payload for OD 10–1000 mm pipes, with wooden cradles preventing deformation during transit
- FOB, CIF, and DDP shipping terms available with real-time tracking and door-to-door coordination for 50+ destination countries
Start Your ERW Pipe Procurement
Submit your specification sheet including OD, wall thickness, steel grade, quantity, and destination port to receive a detailed quotation with mill test certificate preview and production lead time. Our technical team responds within 12 hours with pricing, certification availability, and container loading recommendations tailored to your project timeline.
Request Your ERW Welded Round Steel Pipe Quotation
Send specifications via email or WhatsApp to receive factory-direct pricing, mill test certificates, and global shipping coordination 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
Frequently Asked Questions
Q: How do Q235 and Q345 Chinese grades map to EN and ASTM equivalents?
A: Q235 corresponds to S235JR under EN standards and ASTM A36 under US specifications, while Q345 maps to S355JR and ASTM A572 Grade 50 respectively. We provide cross-reference documentation with each shipment to support customs clearance and engineering approval across multiple regulatory frameworks.
Q: Can you provide mill test certificates and accept third-party inspection before shipment?
A: Yes, every batch of ERW welded round steel pipe ships with an original mill test certificate documenting chemical composition and mechanical properties per heat number. We welcome SGS, BV, or other internationally recognized third-party inspectors to verify dimensions, wall thickness, and material properties at our facility before container sealing.
Q: What is the minimum order quantity for custom OD and wall thickness?
A: The standard MOQ is 1 Ton for catalog specifications. Custom non-standard OD and wall thickness combinations are available subject to production feasibility review, with typical lead times confirmed during quotation based on current mill scheduling and raw material availability.
Q: Which surface treatment option suits corrosive or outdoor environments?
A: Hot-rolled surface provides a clean mill-scale-free base suitable for downstream painting or coating. Oiled finish offers short-term corrosion protection during transit. For long-term outdoor or chemical exposure, we coordinate galvanized or 3PE coating services as value-added processing before shipment.
Q: Do your CE and ISO certificates cover EN 10210 and EN 10219 compliance for EU projects?
A: Yes, our Lloyd’s Register EU CE certification covers both EN 10210 hot-finished structural hollow sections and EN 10219 cold-formed welded hollow sections, ensuring compliance for structural applications across European Union member states and markets recognizing CE marking.
