Description
Factory-Direct ERW Pipe Supply — Every heat number traceable to original mill certificates, shipped with full dimensional reports and third-party inspection options.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Carbon Steel ERW Round Pipe |
| Product Type | ERW Round Steel Pipe |
| Steel Grade | Q235, Q235B, Q345, Q345B, SS400, ASTM A53 (A/B), A106 (B/C), A269, S235JR, S275JR, S355J2, API 5L (Gr.A, Gr.B, X42, X52, X60, X70), Q195 |
| Standard | ASTM A53, ASTM A106, ASTM A213, API 5L, EN 10217-1, DIN, JIS, GB |
| Section Shape | Round |
| Size Range | OD 14–1200 mm |
| Wall Thickness | 1–50 mm |
| Length | 6 m, 12 m, or customized |
| Technique | ERW / Hot Rolled / Cold Rolled |
| Surface Treatment | Black painted, varnished, galvanized (hot-dip/electro), 3LPE/3LPP coated, oiled |
| Tolerance | ±1% |
| Ends | Plain / Beveled / Threaded |
| Application | Fluid transport, gas pipeline, oil pipeline, boiler, construction structural frameworks, scaffolding, shipbuilding marine piping, offshore platforms |
| MOQ | Flexible, cut-to-size accepted |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Transmission pipelines, drilling casings, flow lines using API 5L X42–X70 grades |
| Construction & Infrastructure | Building frames, scaffolding tubes, structural columns in Q235/Q345/S355J2 |
| Shipbuilding & Offshore | Marine piping systems, platform structural members with marine-grade traceability |
| Petrochemical & Power | Boiler tubes, heat exchanger lines, high-temperature fluid transport per ASTM A106/A213 |
| Machinery & Automotive | Hydraulic and pneumatic system lines, exhaust systems, chassis structural members |
Hidden Negative Tolerance: The Real Cost Behind a Cheap Pipe Quote
A ±1% tolerance claim means nothing without a dimensional inspection report per heat.
Procurement teams across Southeast Asia and the Middle East keep running into the same trap: a unit price that looks attractive on paper, but pipes arriving at site with wall thickness deviations that fail third-party inspection. The result is not just a rejected batch — it is weeks of delay, re-fabrication costs, and sometimes structural redesign. For ERW round pipes used in pressure applications or load-bearing frames, even a 0.3 mm shortfall on a 5 mm nominal wall can push the component below the minimum required by EN 10217-1 or API 5L. [NEED_CITE: EN 10217-1 dimensional tolerance requirements for welded steel tubes]
What makes this worse is grade confusion. A buyer specifying S275JR under EN standards may receive Q235B without realizing the yield strength gap, because the supplier treated them as “equivalent.” Without original mill test certificates tied to heat numbers, there is no way to verify chemical composition or mechanical properties before the pipes are cut and welded into a structure.
Matching ERW Round Pipe Grades to Structural and Pressure Applications
When an EPC contractor sources Carbon Steel ERW Round Pipe for a combined project — say, structural columns in S355J2 and process lines in API 5L X52 — the grade selection directly determines whether the pipes meet both load-bearing codes and pressure containment standards. ERW welding produces a consistent longitudinal seam that, when properly controlled, delivers uniform wall thickness across the full OD range from 14 mm to 1200 mm. For scaffolding and building frames, Q235 and Q345 grades provide adequate yield strength at competitive cost. For offshore and marine piping, the same ERW process with 3LPE coating and full MTC traceability ensures the pipes survive salt-spray exposure and pass classification society audits.
Engineering Compliance: From EN 10217-1 to API 5L Across Markets
Structural applications in Europe require compliance with EN 10217-1 or EN 10219, which govern dimensional tolerances, weld seam integrity, and Charpy impact testing at specified temperatures. North American projects typically call for ASTM A53 or A106, where the focus shifts to hydrostatic testing and chemical composition limits for carbon and manganese. API 5L covers line pipe for oil and gas transmission, with PSL1 and PSL2 levels dictating different degrees of non-destructive testing. [NEED_CITE: API 5L PSL1 vs PSL2 requirements for ERW line pipe] Surface treatment selection — black painted for indoor structural use, hot-dip galvanized for outdoor exposure, 3LPE/3LPP for buried or submerged pipelines — must align with the project’s corrosion protection specification. Custom lengths up to 12 m reduce on-site welding joints, while beveled or threaded ends prepare the pipes for direct installation.
Understanding ERW Process, Grade Systems, and Surface Protection
The ERW (Electric Resistance Welding) process forms round pipe from steel coil by passing it through forming rollers and welding the seam using electrical resistance heat — no filler metal required. This makes ERW pipe cost-effective for large-diameter, thin-to-medium wall applications compared to seamless alternatives. The weld seam, when properly normalized, achieves mechanical properties comparable to the parent material. [NEED_CITE: ERW weld seam normalization and mechanical property equivalence]
Steel grade systems map differently across regions: Q235/Q345 (GB, China) roughly correspond to S235JR/S355J2 (EN, Europe) in yield strength tiers, while ASTM A53 Grade B sits in a similar range. API 5L grades from X42 to X70 indicate minimum yield strength in ksi multiples, designed specifically for pressure containment in transmission pipelines. Surface protection choices depend on the service environment: oiled or black painted pipes suit indoor or temporary applications; hot-dip galvanizing provides sacrificial zinc protection for outdoor structural work; 3LPE/3LPP multi-layer coatings offer long-term corrosion resistance for buried oil and gas lines.
What Wrong Grade Selection Actually Costs on Site
Ordering Q235B when the engineering drawing specifies S275JR may seem like a minor substitution — until the structural engineer rejects the batch because the yield strength does not meet the EN 10219 calculation assumptions. Similarly, supplying ASTM A53 Grade A for an A53 Grade B specification creates a gap in minimum tensile strength that fails hydrostatic test requirements. [NEED_CITE: steel grade equivalence between GB, EN, and ASTM standards] Pipes with undocumented negative tolerance may pass visual inspection but fail ultrasonic wall-thickness measurement, triggering full-batch rejection at the port. The real cost is never the pipe price — it is the crane time, the re-welding, the delayed commissioning, and the liability exposure when traceability gaps surface during final inspection.
Direct Mill Supply with Full Traceability and Processing Capability
As a dedicated plate and coil division under Shandong Xin Jiyuan Special Steel Tube Co., Ltd, we supply Carbon Steel ERW Round Pipe directly from mill stock — no trading middlemen, no blended batches. Every order ships with original mill test certificates showing heat number, chemical composition, and mechanical properties. Our facility handles custom cutting, beveling, threading, and bending to reduce your on-site fabrication workload. We maintain ready stock across common OD and wall thickness combinations in Q235, Q345, S235JR–S355J2, ASTM A53/A106, and API 5L grades. ISO 9001:2015 and Lloyd’s CE certifications are in place, with SGS or BV third-party inspection available before shipment. Our logistics team specializes in heavy cargo loading — flatbed, open-top container, and break-bulk — with complete export documentation for FOB, CIF, or DDP delivery to ports worldwide.
Documentation & Compliance
- Mill Test Certificate documenting chemical composition and mechanical properties per heat number for Q235/Q345/S355J2/A53/API 5L grades
- CE certificate covering EN 10217-1 welded steel tube requirements for European market delivery
- ISO 9001:2015 quality management certificate covering the full ERW pipe production and inspection process
- SGS or BV third-party inspection report available upon request, covering dimensional check, visual inspection, and coating thickness measurement
- Full material traceability from coil to finished pipe, with heat number marked on each piece
- Export documentation package including packing list, bill of lading, and certificate of origin for customs clearance
Packaging, Loading & Delivery
- ERW round pipes bundled with steel strips and edge protectors, sized to match OD range and wall thickness to prevent deformation during transit
- Black painted or oiled surfaces wrapped with waterproof paper; galvanized pipes separated by rubber spacers to preserve the zinc coating
- Custom cut-to-length pipes (6 m or 12 m) loaded with optimized container stowage plans to maximize weight utilization within shipping limits
- Heat number and steel grade stenciled on each pipe end for on-site identification and traceability verification
- Professional heavy cargo loading for large-diameter pipes (OD above 600 mm) via open-top container or break-bulk vessel, with flatbed truck delivery available at destination port
- FOB, CIF, and DDP shipping terms supported with full export documentation and real-time tracking
Start Your Procurement with Verified Specifications
Send us your required steel grade, outer diameter, wall thickness, length, quantity, and destination port — we respond within 12 hours with a detailed quotation including material cost, any processing fees, and shipping terms. We will provide original mill test certificates for your review before shipment, and can arrange SGS/BV third-party inspection if your project requires it. For non-standard dimensions or custom cutting and end-preparation work, share your drawing or specification and we will confirm feasibility and lead time.
Request a Quote with Mill Test Certificate
Submit your Carbon Steel ERW Round Pipe specifications — grade, OD, wall thickness, length, and destination — to receive pricing and original mill test certificates within 12 hours.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjyplate.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
