Description
Factory-Direct ERW Square Steel Pipe Supply — S355JR welded square tubes produced under ASTM A500 and EN10219, shipped with full mill test certificates to 50+ countries without broker markups.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355JR ERW Square Steel Pipe |
| Product Type | Welded Square Steel Pipe (ERW) |
| Steel Grade | S235JR, A36, S355, SS400, Q235B |
| Standard | ASTM A500, EN10219, EN10210, JIS G3466, GB/T 6728 |
| Section Shape | Square |
| Size Range | Customized per drawing |
| Wall Thickness | Up to 40mm |
| Length | Customized |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Cold Rolled / Galvanized (optional) |
| Tolerance | ±1% |
| Ends | Plain / Beveled |
| Application | Building structures, machinery manufacturing, infrastructure, vehicle frames, furniture |
| MOQ | Flexible for trial orders |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Steel Structure Contractors | Building frames, trusses, column supports, portal frames |
| Machinery Manufacturers | Equipment bases, automation frames, conveyor structures |
| Infrastructure Projects | Bridge supports, greenhouse skeletons, solar mounting structures |
| Vehicle Manufacturing | Trailer chassis, RV frames, heavy-duty platform frames |
| Architectural Facades | Exposed steel frameworks, handrails, curtain wall supports |
Why S355JR ERW Square Steel Pipe Certification Determines Whether Your Container Clears Customs
Missing or incorrect EN/ASTM references on mill certificates block EU and North American imports at the port.
Procurement teams often discover too late that their supplier’s mill test certificate references the wrong standard version or omits the CE mark required under EN10219. When customs authorities flag the documentation, the entire shipment sits in bond — accruing storage fees while the mill scrambles to reissue papers. For S355JR ERW square steel pipe destined for European projects, the certificate must explicitly state compliance with EN10219 dimensional tolerances and EN10210 structural requirements. [NEED_CITE: EN 10219 cold-formed hollow section dimensional and tolerance requirements]
How S355JR ERW Square Steel Pipe Fits Exposed Structural Frameworks in Commercial Buildings
Architectural facades demand square tubes with tight angular geometry and consistent surface quality — standard rectangular tubes with rounded corners leave visible gaps at welded joints and compromise the clean lines designers specify. Our S355JR ERW square steel pipe maintains ±1% dimensional tolerance across the full length, ensuring that mitered corners align precisely when fabricators assemble curtain wall supports or exposed column grids. The ERW welding process produces a uniform seam that accepts galvanized or painted finishes without visible weld lines, critical for projects where the steel structure remains visible to building occupants.
Structural Compliance and Corrosion Protection for S355JR ERW Square Steel Pipe
Engineering specifications for commercial and industrial buildings typically reference EN 1993 (Eurocode 3) or AISC 360 for structural steel design, both of which recognize S355JR as a valid grade for welded hollow sections when produced under EN10219. [NEED_CITE: EN 1993 design rules for cold-formed hollow sections] For outdoor installations or humid environments, the optional galvanized surface treatment provides corrosion resistance without requiring field-applied coatings that add labor cost and delay project timelines. The S355JR grade offers higher yield strength than S235JR, allowing engineers to specify thinner wall sections while maintaining load-bearing capacity — reducing both material weight and shipping cost per meter.
Understanding S355JR Grade and ERW Welding Process for Square Tubes
The S-series steel grades (S235JR, S275JR, S355JR) follow the European EN standard system where the number indicates minimum yield strength in MPa — S355JR delivers higher structural capacity than S235JR, making it suitable for heavier load applications like crane runways or multi-story building frames. The ERW (Electric Resistance Welded) process forms the square profile from steel coil by cold-forming and welding the seam through electrical resistance heating, producing a consistent weld without filler material. This method suits square and rectangular hollow sections in the 20×20mm to 400×400mm range with wall thicknesses up to 40mm, offering better dimensional accuracy than SSAW for smaller profiles. [NEED_CITE: ERW welding process advantages for structural hollow sections] The optional galvanized coating applies a zinc layer that sacrificially protects the base steel from atmospheric corrosion, extending service life in outdoor or industrial environments where painted finishes would require maintenance.
The Hidden Cost of Ordering S355JR ERW Square Steel Pipe Without Verified Mill Certificates
Purchasing square tubes based on price alone, without confirmed mill test certificates and third-party inspection, exposes projects to material substitution risk — suppliers may ship lower-grade steel (Q235B labeled as S355JR) that fails structural load tests during engineering inspection. [NEED_CITE: steel grade equivalence verification between EN and ASTM standards] When the engineer’s site inspector requests chemical composition reports and finds discrepancies, the entire batch faces rejection, forcing the contractor to source replacement material at premium spot-market prices while the project schedule slips. Certification gaps also trigger customs holds in regulated markets, where import authorities require CE marks and EN standard references before releasing structural steel for construction use.
Why Project Procurement Teams Source S355JR ERW Square Steel Pipe Directly from Our Mill
We operate three dedicated production lines covering 2,800+ specifications, allowing us to supply S355JR ERW square steel pipe in both standard and non-standard sizes without subcontracting to other mills. Our in-house physical and chemical laboratory performs dimensional, mechanical, and compositional testing on every heat, generating mill test certificates that document exact chemical composition and yield strength per EN10219 requirements. We hold CE certification under EN10219 and EN10210, Singapore FPC approval, and ISO 9001:2015 registration — documents that satisfy customs and engineering inspectors across EU, Middle East, and Southeast Asian markets. For projects requiring custom lengths, cutting, punching, or bending, our processing services eliminate the need for secondary fabrication at the job site. Every export container receives a custom loading plan designed to prevent coating damage and dimensional distortion during ocean transit — a protocol developed after early shipments to West African ports revealed how improper bracing scrapes galvanized coatings and bends square profiles.
Documentation & Compliance
- Mill test certificate documenting S355JR chemical composition and yield strength per EN10219, issued per heat number
- CE certificate confirming compliance with EN10219 (cold-formed welded hollow sections) and EN10210 (structural hollow sections)
- ISO 9001:2015 quality management system certificate covering production and inspection processes
- SGS or BV third-party inspection report available upon request, verifying dimensional tolerance and surface quality before shipment
- Material traceability by heat number linking each bundle to its mill test certificate and production batch
- Complete customs documentation package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- S355JR ERW square steel pipe bundled with steel strips and edge protectors to maintain ±1% dimensional tolerance during handling
- Galvanized surfaces wrapped with moisture-barrier film to prevent white rust formation during ocean transit to tropical ports
- Custom container loading plans optimized for 6m and 12m lengths, maximizing payload while preventing bundle shift and coating damage
- Cutting and beveling services available to project-specified lengths, reducing on-site fabrication time for steel structure contractors
- Heat number and steel grade marked on each tube end for site identification and traceability during installation
- FOB, CIF, and DDP shipping terms available, with professional loading supervision at Shandong port facilities
How to Request a Quotation for S355JR ERW Square Steel Pipe
Submit your project specifications — including outer dimension, wall thickness, length, steel grade, surface treatment, and destination port — and our technical team responds within 12 hours with unit pricing, production lead time, and available mill test certificate samples. For non-standard sizes or custom processing requirements, we provide detailed fabrication drawings and confirm compliance with your project’s engineering standard before production begins.
Frequently Asked Questions
Q: Can you supply S355JR ERW square steel pipe with CE certification for EU construction projects?
A: Yes, our S355JR ERW square steel pipe carries CE certification under EN10219 and EN10210, with mill test certificates documenting chemical composition and mechanical properties per European standard requirements. We also hold Singapore FPC approval and can arrange SGS or BV third-party inspection before shipment.
Q: What is the minimum order quantity for custom-sized S355JR ERW square steel pipe?
A: We offer flexible MOQ for trial orders and project-specific requirements. Our 2,800+ specification range covers standard and non-standard sizes, and we produce custom dimensions on dedicated production lines without subcontracting.
Q: Can you provide cutting, punching, or bending services for S355JR ERW square steel pipe?
A: Yes, our processing services include cutting to project-specified lengths, punching for bolt connections, and bending for curved structural elements. These services reduce on-site fabrication time and ensure dimensional accuracy for steel structure assembly.
Q: How do you ensure the galvanized coating remains intact during ocean shipping?
A: We bundle galvanized S355JR ERW square steel pipe with edge protectors and wrap bundles in moisture-barrier film. Every export container follows a custom loading plan that prevents bundle movement and coating contact during transit, developed from experience with shipments to ports in Africa, Southeast Asia, and the Middle East.
Q: What steel grade equivalents do you offer if S355JR is not available in my market?
A: We supply equivalent grades across multiple standards: ASTM A500 Grade B/C for North American projects, Q235B/Q345B for Chinese standard specifications, and SS400 for JIS applications. Our technical team provides grade equivalence documentation to support your engineering approval process.
Request Your S355JR ERW Square Steel Pipe Quotation Today
Send your project specifications to receive pricing, mill test certificate samples, and production lead time confirmation within 12 hours.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
