Description
Factory-Direct ERW Round Pipe — OD 14–1200mm and WT up to 50mm produced in-house with ±1% dimensional tolerance and full mill test certification.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Carbon Steel ERW Round Pipe |
| Product Type | Round Steel Pipe / ERW Pipe |
| Steel Grade | Q195, Q235, Q235B, Q345, Q345B, SS400, ASTM A53 (A/B), ASTM A106 (B/C), ASTM A269, API 5L (Gr.A, Gr.B, X42, X52, X60, X70), S235JR, S275JR, S355J2 |
| Standard | ASTM A53, ASTM A106, ASTM A213, ASTM A269, API 5L, EN 10217-1, DIN EN 10217-1, JIS, GB |
| Section Shape | Round |
| Size Range | Outer Diameter 14–1200 mm |
| Wall Thickness | 1–50 mm |
| Length | 6000 mm, 12000 mm (customizable) |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Black Painted, Varnished, Galvanized (Hot-Dip/Electro), 3LPE/3LPP Coated, Oiled, Cold Rolled |
| Tolerance | ±1% |
| Ends | Plain / Beveled / Threaded |
| Application | Fluid transport, Gas pipeline, Oil pipeline, Structural frameworks, Scaffolding, Drilling, Petrochemical industry, Boiler, Marine piping, Offshore platforms, Automotive exhaust systems, Hydraulic and pneumatic systems |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Pipeline transmission, drilling casings, offshore platform piping |
| Construction & Infrastructure | Structural frameworks, scaffolding systems, marine piping |
| Industrial Machinery | Hydraulic cylinders, pneumatic lines, automotive exhaust components |
| Petrochemical | Boiler tubes, heat exchanger piping, process fluid transport |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
A ±1% tolerance on an ERW round pipe means the difference between passing inspection and an entire container being rejected at the port.
I once watched a 6-meter shipment of ERW round pipes get turned away at a Southeast Asian job site because the wall thickness sat right at the edge of the negative tolerance limit. The client pulled out a caliper, measured a dozen pieces, and refused the lot — citing load-bearing non-compliance. That single batch cost weeks of delay and a full return shipment. Since then, every order we ship goes through in-house dimensional and mechanical testing before it leaves the factory floor. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
When buyers source Carbon Steel ERW Round Pipe from multiple suppliers without verified tolerance control, the risk is not just one bad batch — it is inconsistent weld quality, unpredictable weight-per-meter calculations, and structural members that do not match engineering drawings. Grade confusion across GB, ASTM, and EN standards compounds the problem, leading to material mismatches that only surface during third-party inspection or customs clearance.
How ERW Round Pipe Matches Structural and Fluid-Conveyance Engineering
Carbon Steel ERW Round Pipe in OD 14–1200mm covers the full spectrum from small-bore hydraulic lines to large-diameter structural columns. The ERW process produces a continuous longitudinal weld with consistent wall thickness, making it suitable for both pressure-rated fluid transport and load-bearing structural frameworks. For projects requiring ASTM A53 or API 5L compliance, the weld seam undergoes ultrasonic inspection to meet standard requirements. Our 2,800+ specification range means contractors can source scaffolding tubes, pipeline sections, and structural members from a single purchase order — eliminating the coordination overhead of multi-supplier procurement.
Engineering Compliance and Certification Requirements
Structural applications demand compliance with EN 10219 for cold-formed welded structural hollow sections or ASTM A500/A53 for North American projects. Fluid transport in oil and gas requires API 5L certification with specific chemical composition limits for sour service environments. For EU market entry, CE marking per EN 10210/EN 10219 is mandatory — missing documentation blocks customs clearance regardless of product quality. [NEED_CITE: steel grade equivalence between EN 10219 and ASTM A53 standards] Our in-house physical and chemical laboratory tests every heat for dimensional accuracy, mechanical properties, and composition before issuing mill test certificates.
Steel Grade Selection and ERW Process Fundamentals
The Q-series (Q195–Q345) follows Chinese GB standards, with yield strength increasing from 195 MPa to 345 MPa grade — suitable for general structural and low-pressure fluid applications. The S-series (S235JR–S355J2) aligns with European EN standards, where the JR designation indicates room-temperature impact testing and J2 specifies -20°C impact requirements for cold-climate installations. API 5L grades from Gr.B to X70 address pipeline transmission, with higher X-grades providing enhanced yield strength for high-pressure gas and oil transport. The ERW process uses electric resistance to forge the weld seam without filler metal, producing a clean internal profile ideal for fluid flow and a consistent external surface for galvanizing or 3LPE coating application. [NEED_CITE: ERW vs seamless steel pipe manufacturing process comparison]
Hidden Costs of Incorrect Grade or Missing Certification
Specifying Q235 when the engineering drawing calls for S355J2 creates a yield strength gap that compromises structural safety — but the mismatch may not surface until on-site inspection or load testing. Shipping Carbon Steel ERW Round Pipe to the EU without CE marking or EN 10219 compliance documentation results in customs holds, demurrage charges, and potential return shipments. Negative tolerance abuse — where actual wall thickness falls below the specified minimum — reduces load capacity and triggers rejection by third-party inspectors. [NEED_CITE: consequences of steel grade non-compliance in structural engineering]
Why Source Carbon Steel ERW Round Pipe from SD XJY Pipe
We operate three dedicated ERW production lines covering 2,800+ specifications, allowing single-order procurement of OD 14–1200mm pipes across multiple steel grades and surface treatments. Our in-house physical and chemical laboratory performs dimensional, mechanical, and compositional testing on every heat, with mill test certificates issued before shipment. Full international certifications — ISO 9001:2015, Lloyd’s CE (EN 10210/EN 10219), Singapore FPC, and SGS/BV third-party verification — ensure customs clearance across 50+ export markets. Custom non-standard sizes, cutting, and end preparation are available with low MOQ, supporting project-specific requirements without premium pricing. Professional container loading with anti-damage measures prevents bending and surface defects during ocean transit.
Documentation & Compliance
- Mill test certificate documenting Q235B/Q345B chemical composition and yield strength per GB/T 13793 or ASTM A53
- CE certificate per EN 10210/EN 10219 for S235JR–S355J2 grades exported to EU markets
- ISO 9001:2015 quality management certificate covering full production and inspection process
- SGS or BV third-party inspection report available upon request for API 5L and ASTM A106 grades
- Material traceability by heat number linking each pipe to its mill test certificate
- Customs documents including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Black painted or oiled ERW round pipes bundled with steel strips and edge protectors to prevent surface damage during ocean transit
- Galvanized pipes packed with plastic end caps and separated layers to preserve zinc coating integrity
- 3LPE/3LPP coated pipes wrapped with protective film and loaded on wooden cradles to prevent coating abrasion
- 6m and 12m standard lengths optimized for 20ft and 40ft container loading with professional lashing
- Heat number and steel grade stenciled on each pipe for site identification and traceability
- FOB, CIF, and DDP shipping terms available with full export documentation
How to Request a Quotation for Carbon Steel ERW Round Pipe
Submit your specification sheet including outer diameter, wall thickness, steel grade, surface treatment, quantity, and destination port. We respond within 12 hours with unit pricing, mill test certificate samples, and production lead time. For non-standard sizes or custom lengths, our technical team provides feasibility confirmation and tooling requirements.
Get Your Carbon Steel ERW Round Pipe Quote Today
Send your inquiry with specifications and quantity to receive pricing, mill test certificates, and delivery schedule within 12 hours.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjypipe.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: How do Q235, ASTM A53, and S235JR steel grades compare for structural applications?
A: Q235 (GB standard), ASTM A53 Gr.B (US standard), and S235JR (EN standard) are broadly equivalent for general structural use, with yield strength around 235 MPa. The key difference lies in impact testing requirements — S235JR specifies room-temperature Charpy impact values, while Q235 and ASTM A53 focus primarily on tensile and yield properties. For cold-climate projects, S355J2 with -20°C impact testing is preferred.
Q: Do you provide CE marks and EN 10217 compliance for EU imports?
A: Yes. Our Carbon Steel ERW Round Pipe in S235JR–S355J2 grades carries Lloyd’s CE certification per EN 10210 (seamless) and EN 10219 (welded hollow sections). Mill test certificates conform to EN 10168 format, and third-party inspection by SGS or BV is available for customs clearance documentation.
Q: Can you produce non-standard OD and wall thickness with low minimum order?
A: We cover 2,800+ specifications from OD 14–1200mm and wall thickness 1–50mm. Custom non-standard sizes are available with flexible MOQ — send your drawing or specification for feasibility confirmation and pricing.
Q: When should I choose galvanized vs. 3LPE vs. black painted surface treatment?
A: Hot-dip galvanizing provides corrosion protection for outdoor structural and scaffolding applications. 3LPE/3LPP coating is specified for buried oil and gas pipelines requiring long-term soil corrosion resistance. Black painted or oiled finish suits indoor structural use or pipes that will be field-coated after welding.
Q: What is the production lead time and how do you ensure damage-free container loading?
A: Standard sizes ship from stock; custom sizes require typical production lead times of 15–25 days. Professional loading with steel cradles, edge protectors, and anti-damage lashing prevents bending and surface defects during ocean transit. Loading photos are provided before shipment for buyer confirmation.
