Description
Factory-Direct ERW Round Pipe Supply — Every batch of Carbon Steel ERW Round Pipe ships with original mill test certificates and factory pricing, eliminating middleman markups across Q235, Q345, A53, A106, and API 5L grades.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Carbon Steel ERW Round Steel Pipe |
| Product Type | ERW Round Steel Pipe |
| Steel Grade | Q235, Q235B, Q345, Q345B, SS400, A53 (A/B), A106 (B/C), A269, A53-A369, S235JR, S275JR, S355J2, API 5L (Gr.A, Gr.B, X42, X52, X60, X70) |
| Standard | ASTM A53, ASTM A106, ASTM A213, API 5L, EN 10217-1, DIN EN 10217-1, JIS G3466, GB/T |
| Section Shape | Round |
| Outer Diameter | 10mm – 1200mm |
| Wall Thickness | 1mm – 50mm |
| Length | 6m, 12m, 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 |
| Tensile Strength | 350 – 850 MPa |
| Yield Strength | 205 – 700 MPa |
| Elongation | 10% – 35% |
| Hardness | ≤ 200 HB |
| Application | Fluid transport, Gas pipeline, Oil pipeline, Construction structural frameworks, Scaffolding, Machinery, Shipbuilding, Automotive |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Pipeline transmission, drilling operations, gas distribution networks using API 5L grades |
| Construction & Infrastructure | Structural frameworks, scaffolding systems, building columns per ASTM A53 and EN S355J2 |
| Machinery & Industrial Equipment | Hydraulic and pneumatic systems, fluid conveyance lines, machine frames |
| Shipbuilding & Marine | Marine piping, offshore platform structures, deck support members |
| Automotive | Exhaust systems, chassis components, structural reinforcements |
What Negative Wall Tolerance Really Costs on a Pipeline Order
A 12% negative tolerance on a 6-meter ERW round pipe can shift an entire container’s weight by nearly two tons — and fail third-party inspection at the discharge port.
I watched a full container of ERW round pipes get stranded at Jebel Ali because the wall thickness ran well below the ordered specification. The buyer’s third-party inspector flagged it immediately. The steel grade on the mill certificate looked correct, but the actual product didn’t match. Re-sorting, re-inspecting, and arranging replacement stock added weeks of delay and thousands in demurrage. That kind of quality gap doesn’t show up in a catalog — it shows up when your project timeline and budget are already under pressure. [NEED_CITE: impact of wall thickness tolerance on structural load capacity]
Matching ERW Round Pipe to Structural and Pressure Applications
Carbon Steel ERW Round Pipe in OD 10–1200mm covers everything from small-bore hydraulic lines to large-diameter pipeline transmission. For structural frameworks and scaffolding, Q235 and S235JR provide adequate yield strength at lower cost, while Q345 and S355J2 serve heavier load-bearing columns and beams. In oil and gas applications, API 5L grades from Gr.B through X70 meet pressure containment requirements across onshore and offshore installations. Our ERW process with ±1% tolerance control ensures the wall thickness you specify is what arrives on-site — verified by original mill test certificates on every heat number.
Engineering Compliance and Certification Requirements
Structural projects in Europe require CE marking under EN 10210 or EN 10219, and our Carbon Steel ERW Round Pipe carries Lloyd’s CE certification covering these standards. North American buyers sourcing to ASTM A53 or A106 need mill test certificates documenting chemical composition and mechanical properties per heat number. API 5L grades demand PSL-level documentation for pipeline use. For corrosion-prone environments — coastal construction, offshore platforms, underground fluid transport — surface treatment selection between hot-dip galvanizing, 3LPE coating, or black painting directly affects service life. [NEED_CITE: EN 10219 cold-formed hollow section compliance requirements] Custom cut lengths from 6m to 12m reduce on-site welding and secondary processing, which matters when your erection crew is billing by the hour.
Steel Grade Selection and ERW Process Fundamentals
The Q-series (Q235, Q345) follows the Chinese GB system where the number indicates minimum yield strength in MPa. The S-series (S235JR, S275JR, S355J2) follows the European EN system with similar yield-based naming. ASTM A53 and A106 serve the American market, with A53 covering general structural and low-pressure fluid use while A106 targets high-temperature service. API 5L grades from Gr.A to X70 are purpose-built for pipeline pressure containment, with higher X-numbers indicating greater yield strength for deep-water or long-distance transmission.
ERW (Electric Resistance Welded) pipe forms steel strip into a round cross-section and welds the seam through electrical resistance heating — no filler metal added. This process delivers tight dimensional tolerance and smooth surface finish at lower cost than seamless pipe, making it the standard choice for structural applications and medium-pressure fluid transport. For corrosion protection, hot-dip galvanizing provides a zinc coating suitable for outdoor and marine exposure, while 3LPE/3LPP multi-layer coatings serve buried or submerged pipeline applications requiring long-term cathodic disbondment resistance.
Wall thickness tolerance directly affects both weight and load capacity. A ±1% tolerance means the actual wall stays within 1% of the nominal value — critical when structural calculations depend on precise section modulus. [NEED_CITE: steel grade equivalence between GB, EN, and ASTM standards]
Hidden Costs of Buying the Wrong Grade or Unverified Stock
Ordering Q235 when the structural engineer specified S355J2 means the pipe yields under design load — a failure that doesn’t surface until the frame is erected and loaded. Shipping material without proper mill test certificates triggers customs holds at the destination port, especially in EU markets requiring CE documentation. Accepting pipes with excessive negative tolerance reduces the actual cross-section below what your structural calculations assumed, creating safety margins that exist only on paper. Replacing rejected material after arrival costs multiples of the original pipe price when you factor in return freight, project delays, and re-inspection fees. [NEED_CITE: consequences of material certification gaps in international steel trade]
Why Project Buyers Source Carbon Steel ERW Round Pipe From Us
We operate three production lines running simultaneously, producing over 20,000 tons monthly — capacity that supports urgent bulk orders without pulling stock from other customers. Our inventory covers 2,800+ specifications across round pipes, square and rectangular tubes, plates, coils, and section steel, meaning you can consolidate a multi-category project order into a single shipment rather than coordinating with five different suppliers. Every batch leaves our facility with original mill test certificates, and we welcome SGS or BV third-party inspection at any stage. Factory-direct pricing with no trading company markup applies to orders from 1 ton trial quantities through full-container bulk purchases. Our export team handles container loading optimization — critical for round pipes where nesting efficiency determines whether you ship 18 tons or 26 tons per 40-foot container.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345/A53/A106/API 5L chemical composition and mechanical properties per heat number
- Lloyd’s CE certificate covering EN 10210 and EN 10219 for European market structural compliance
- ISO 9001:2015 quality management system certificate covering full production and inspection process
- SGS or BV third-party inspection report available upon request for independent quality verification
- Material traceability by heat number linking each pipe to its original slab chemistry and rolling record
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- ERW round pipes bundled with steel strips and edge protectors, sized to match the 6m or 12m standard length for stable ocean transit
- Black painted and oiled surfaces wrapped with waterproof paper to prevent moisture damage during container shipping
- Galvanized Carbon Steel ERW Round Pipe loaded with wooden separators to preserve the zinc coating from abrasion
- Container loading plans optimized for round pipe nesting, maximizing payload per 20ft or 40ft container based on OD and wall thickness
- Heat number and steel grade stenciled on each pipe end for on-site identification and traceability verification
- FOB, CIF, and DDP terms available with professional export documentation and real-time shipment tracking
Start Your Carbon Steel ERW Round Pipe Inquiry
Submit your specifications — outer diameter, wall thickness, steel grade, quantity, and destination port — and receive a detailed quotation within 12 hours including volume pricing, delivery schedule, and available mill test certificate documentation. For non-standard dimensions or custom cut lengths, our team will confirm feasibility and lead time based on current production capacity.
Request Factory-Direct Pricing and Mill Test Certificates
Send your Carbon Steel ERW Round Pipe requirements via email at admin@sdxinjiyuan.com or contact us on WhatsApp at +86 188 5315 7756 to receive bulk pricing and certification documentation.
Frequently Asked Questions
Q: How do Q235/Q345 grades compare to A53 and S235JR/S355J2?
A: Q235 and S235JR offer similar yield strength levels suitable for general structural applications, while Q345 and S355J2 provide higher yield strength for heavier load-bearing requirements. ASTM A53 covers comparable structural and low-pressure fluid applications in the North American market. We supply all three standard systems and can provide cross-reference guidance based on your project specifications.
Q: What certifications are provided, and will they pass EU and US customs?
A: Every shipment includes original mill test certificates documenting chemical composition and mechanical properties. For European markets, our Lloyd’s CE certification under EN 10210 and EN 10219 ensures customs compliance. For North American projects, ASTM A53 and A106 documentation meets standard import requirements. Third-party inspection reports from SGS or BV are available upon request.
Q: Can you produce non-standard outer diameters or wall thicknesses?
A: Yes. Our standard range covers OD 10–1200mm and wall thickness 1–50mm. For dimensions outside standard catalog sizes, we can arrange custom production with typical lead times confirmed at inquiry stage. The minimum order quantity for custom specifications starts from 1 ton.
Q: When should I choose galvanized versus black painted versus 3LPE coating?
A: Hot-dip galvanizing suits outdoor structural applications and moderate corrosion environments where the zinc coating provides sacrificial protection. Black painting with oil serves indoor or temporary protection needs during construction. 3LPE/3LPP multi-layer coatings are specified for buried pipelines, offshore structures, or applications requiring long-term resistance to soil stress and cathodic disbondment.
Q: How is container loading optimized for round pipes?
A: Round pipes can be nested to improve container utilization compared to square or rectangular sections. Our loading team calculates the optimal arrangement based on your specific OD, wall thickness, and length to maximize payload per container. This reduces per-ton freight cost and minimizes the number of containers needed for your project.
