Description
Factory-Direct ERW Pipe Supply — 3 dedicated production lines covering 6–1820 mm OD with in-house physical and chemical laboratory testing for every heat.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 S355 20# 16Mn ERW Welded Round Steel Pipe |
| Product Type | ERW Welded Round Steel Pipe |
| Steel Grade | Q235, S355, 20#, 45#, 16Mn, A36, Q195, Q355, 10#, ST35–ST52, A53–A369 |
| Standard | ASTM A53, ASTM A671, ASTM A252, ASTM A450, ASTM A523, API 5L, ASME B36.10M, BS 1387, BS EN 10296, BS 6323, BS 6363, BS EN 10219, GB/T 3091, GB/T 13793, GB/T 9711 |
| Section Shape | Round |
| Size Range | 6–1820 mm OD |
| Wall Thickness | Hot rolled 4–20 mm; Cold rolled 1–4.0 mm |
| Length | 1–12 m |
| Technique | ERW / Hot Rolled Based / Cold Rolled |
| Surface Treatment | Hot Rolled, Slightly Oiled |
| Tolerance | ±1% |
| Ends | Plain (default) |
| Processing Service | Welding, Punching, Cutting, Bending |
| Application | Fluid transport, Boiler, Drill pipe, Hydraulic pipe, Gas pipe, Oil pipe, Chemical fertilizer pipe, Building industry, Machinery |
| MOQ | 5 Tons |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas Pipeline | Fluid transport, gas pipeline, oil pipeline, drill pipe |
| Industrial Machinery | Hydraulic pipe, boiler piping, machinery structural frames |
| Construction & Infrastructure | Building industry structural supports, scaffold tubing, pile casing |
| Chemical Processing | Chemical fertilizer pipe, process piping, corrosion-resistant conveyance |
What Wall-Thickness Tolerance Costs on a Large-Diameter ERW Round Pipe Order
±1% OD and wall tolerance on every ASTM Q235 S355 ERW welded round steel pipe prevents weight disputes and structural miscalculations at site.
Procuring large-diameter ERW round pipes across mixed standards — ASTM, EN, GB — routinely surfaces grade equivalence confusion. A Q235 order shipped without verified MTC alignment to S235JR or A36 triggers third-party rejection at destination ports. Wall thickness drifting beyond tolerance inflates theoretical weight invoicing while reducing actual load-bearing capacity. [NEED_CITE: steel grade equivalence between EN and ASTM standards]
Matching Large-Diameter ERW Pipe to Structural and Conveyance Engineering
Large-diameter ERW welded round steel pipes from 6 mm to 1820 mm OD serve both pressure conveyance and structural framing. The slightly oiled hot-rolled surface protects against transit corrosion without interfering with field welding or coating application. Wall thickness from 1 mm cold-rolled to 20 mm hot-rolled covers hydraulic systems through pile casing, while ±1% tolerance ensures dimensional predictability for CNC cutting and orbital welding on site.
Engineering Compliance and Certification Requirements
Structural applications demand compliance with EN 1993 or AISC frameworks, where ASTM Q235 S355 ERW welded round steel pipe certified to BS EN 10219 or ASTM A53 provides traceable mechanical properties. EU customs require Lloyd’s CE marking per EN 10210/EN 10219; North American projects reference ASTM A53 or API 5L. [NEED_CITE: EN 10219 cold-formed hollow section requirements] In-house physical and chemical laboratories verify each heat against standard requirements before MTC issuance. Custom lengths from 1–12 m reduce field cutting waste, while plain ends accept site welding or mechanical coupling.
Steel Grade Selection and ERW Process Fundamentals
Q235 and S355 represent Chinese GB and European EN structural grades respectively, with 20# and 16Mn covering seamless-equivalent carbon and manganese specifications for pressure service. The ERW welding process forms round pipe from coil through continuous forming and high-frequency resistance welding, producing a longitudinal seam suitable for low-to-medium pressure conveyance and structural use. Hot-rolled wall thickness from 4–20 mm serves heavy structural and pile applications, while cold-rolled 1–4.0 mm meets precision machinery and hydraulic requirements. Slightly oiled surface treatment provides short-term corrosion protection during ocean transit without compromising subsequent galvanizing or 3PE coating adhesion. [NEED_CITE: ERW versus seamless steel pipe manufacturing differences]
Hidden Costs of Incorrect Grade or Tolerance Procurement
Ordering ASTM Q235 S355 ERW welded round steel pipe without verified grade equivalence risks customs rejection in regulated markets — CE-marked EN 10219 pipe cannot substitute for ASTM A53 without documentation alignment. Wall thickness beyond negative tolerance reduces load capacity and triggers structural engineer rejection. Missing MTC or incorrect heat number traceability blocks project handover and payment release. [NEED_CITE: consequences of non-compliant steel pipe documentation in construction projects]
Why Source Large-Diameter ERW Pipe from SD XJY Pipe
Factory-direct pricing eliminates trader margins on every ASTM Q235 S355 ERW welded round steel pipe, with 3 dedicated production lines covering 2,800+ specifications across round, square, and rectangular profiles. In-house physical and chemical laboratories perform dimensional, mechanical, and chemical testing per heat, issuing MTC aligned with ASTM, EN, and GB grade equivalents. Full international certifications — ISO 9001:2015, Lloyd’s CE (EN 10210/EN 10219), Singapore FPC, SGS/BV verified — clear customs in EU, North America, and regulated markets. Professional container loading with anti-damage measures prevents bending and surface scoring during ocean transit to 50+ countries. Custom non-standard sizes, cutting, marking, and professional loading available with low MOQ.
Documentation & Compliance
- Mill test certificate documenting Q235, S355, 20#, or 16Mn chemical composition and mechanical properties per ASTM A53, BS EN 10219, or GB/T 3091
- Lloyd’s CE certificate per EN 10210/EN 10219 for EU structural and conveyance applications
- ISO 9001:2015 quality management certificate covering ERW welding and dimensional inspection
- SGS or BV third-party inspection report available upon request for pre-shipment verification
- Material traceability by heat number linking each pipe to laboratory test results
- Customs documents including packing list, bill of lading, and certificate of origin for FOB, CIF, or DDP shipments
Packaging, Loading & Delivery
- Large-diameter ERW welded round steel pipes bundled with steel strips and edge protectors to preserve slightly oiled surface during ocean transit
- Hot-rolled pipes (4–20 mm wall) packed in seaworthy bundles; cold-rolled precision pipes (1–4.0 mm) individually wrapped to prevent surface contact damage
- Container loading optimized for 1–12 m lengths with anti-bending supports for 1820 mm OD pipes, maximizing 20ft and 40ft GP utilization
- Heat number and steel grade stenciled on each pipe end for site traceability and MTC cross-reference
- FOB Jinan/Qingdao, CIF destination port, or DDP door-to-door delivery with full export documentation and tracking
Initiating Your Large-Diameter ERW Pipe Inquiry
Submit outer diameter, wall thickness, steel grade, length, quantity, and destination port to receive detailed quotation with unit pricing, typical production lead times, and mill test certificate sample. Non-standard sizes and custom processing — cutting, punching, bending — quoted separately with engineering drawing review. Certification and customs documentation confirmed before contract signing to prevent clearance delays.
Frequently Asked Questions
Q: How do Q235, S355, 20#, and 16Mn map across ASTM, EN, and GB standards?
A: Q235 approximates A36 and S235JR for structural use; S355 aligns with ASTM A572 Gr.50 for higher yield strength; 20# and 16Mn serve pressure and seamless-equivalent applications per GB/T 3091 and GB/T 9711. Mill test certificates document chemical composition and mechanical properties per the ordered standard.
Q: Can I request third-party inspection before shipment?
A: Yes, SGS or BV inspection is arranged on request. In-house physical and chemical laboratories perform dimensional, mechanical, and chemical testing per heat, with full inspection report and photos provided before shipment.
Q: What is the MOQ for custom OD, wall thickness, or length?
A: Standard MOQ is 5 tons. Custom non-standard sizes enter production with typical lead times of 15–25 days depending on specification complexity and quantity.
Q: What surface treatment options are available beyond slightly oiled?
A: Hot-rolled slightly oiled is standard for transit protection. Galvanized, 3PE coating, and painted finishes available upon request for corrosion-resistant applications.
Q: How are large-diameter pipes loaded to prevent damage?
A: Professional container loading with anti-bending supports and edge protectors prevents surface scoring and deformation during ocean transit. Loading方案 reviewed and approved before dispatch.
Secure Your ASTM Q235 S355 ERW Welded Round Steel Pipe Supply
Submit specifications — OD, wall thickness, grade, length, quantity, destination — to receive quotation with mill test certificate and certification confirmation within 12 hours.
Contact: 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
