Description
Factory-Direct ERW Square Pipe Pricing — Shandong Xin Jiyuan manufactures S355JR ERW welded square steel pipe on dedicated lines, eliminating trading margins for project buyers.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355JR ERW Welded Square Steel Pipe |
| Product Type | Welded Square Steel Pipe (ERW) |
| Steel Grade | S235JR, A36, S355, SS400, Q235B |
| Standard | ASTM A500, EN 10219, EN 10210, JIS G3466, GB/T 6728 |
| Section Shape | Square |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Cold Rolled / Galvanized (optional) |
| Tolerance | ±1% |
| Length | Customized |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Invoicing | By Theoretical Weight |
| Oiled or Non-oiled | Non-oiled |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Building Structures | Trusses, beams, and columns for factories, stadiums, commercial centers |
| Machinery Manufacturing | Machine tool frames, conveyor support structures, automation equipment bases |
| Infrastructure Construction | Bridge auxiliary structures, stage trusses, greenhouse frames |
| Vehicle Manufacturing | Trailer chassis, RV structural frames |
| Home Decor & Furniture | Stair handrails, security window frames, furniture support frames |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
±1% tolerance on High Quality ERW Welded Square Steel Pipe Factory Price orders prevents field rework and inspection rejection.
I once watched a 50×50 square tube shipment get rejected on a Philippine high-rise site — the specified 3.0mm wall measured 2.5mm on calipers. The negative tolerance was so aggressive that the supervising engineer refused sign-off. Air-freighting replacement tubes cost more than the original cargo. Since then, I verify wall thickness against lab data before every container leaves the mill. When procurement teams source High Quality ERW Welded Square Steel Pipe Factory Price from multiple vendors without consistent tolerance control, they face dimensional mismatches at connection joints, weld gaps that exceed code limits, and structural members that fail load calculations under actual conditions [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements].
How S355JR ERW Square Tube Matches Structural Frame Demands
S355JR grade delivers the yield strength range that structural engineers specify for moment-resisting frames and braced systems in commercial buildings. The ERW welding process produces a clean, continuous weld seam that maintains uniform mechanical properties across the cross-section — critical when these tubes serve as primary columns or truss chords. Our production lines hold the High Quality ERW Welded Square Steel Pipe Factory Price advantage while maintaining ±1% dimensional control that matches EN 10219 and ASTM A500 requirements. For projects in corrosive environments, optional galvanized coating extends service life without field-applied painting delays.
Engineering Compliance and Certification Pathways
Structural steel procurement for EU projects requires CE marking under EN 10210 or EN 10219 — missing this documentation triggers customs holds and site inspection failures. North American projects reference ASTM A500 Grade B or C, requiring mill test certificates that trace chemical composition to heat numbers. Our in-house laboratory issues original MTCs for every heat, and we coordinate SGS or BV third-party inspections when project specifications demand independent verification. Custom cut-to-length service eliminates field cutting waste, while punch and bend processing reduces secondary fabrication costs at the erection site [NEED_CITE: steel grade equivalence between EN 10219 and ASTM A500 standards].
Steel Grade Selection and ERW Process Fundamentals
S235JR, S355, and Q235B represent different yield strength tiers across European and Chinese standard systems — S355JR provides higher load capacity for heavy-duty structural applications, while S235JR suits lighter framing where weight optimization matters. SS400 and A36 serve Japanese and American specification requirements respectively, allowing single-source procurement for multi-standard projects. The ERW process uses electric resistance to fuse the formed strip edges without filler metal, producing a narrow heat-affected zone that maintains base metal ductility. This makes ERW square tube cost-effective for structural applications where seamless pipe’s pressure ratings are unnecessary, but dimensional accuracy and surface finish remain critical.
Hidden Costs of Incorrect Steel Grade Procurement
Specifying S235JR when the structural calculation requires S355JR creates a safety margin deficit that only surfaces during load testing or under extreme conditions. Conversely, over-specifying high-strength grades inflates material costs without engineering justification. Material substitution without proper documentation voids insurance coverage and creates liability exposure if structural performance falls short. Certification gaps — missing CE marks for EU shipments or incomplete MTCs for North American projects — result in customs delays that cascade into construction schedule overruns and liquidated damages [NEED_CITE: structural steel certification requirements for international construction projects].
Why Project Buyers Source High Quality ERW Welded Square Steel Pipe Factory Price from Xin Jiyuan
We operate three dedicated production lines covering 2,800+ specifications, allowing single-source procurement for projects requiring multiple square tube sizes and steel grades. Our in-house physical and chemical laboratory tests every heat before release, ensuring that the High Quality ERW Welded Square Steel Pipe Factory Price you receive comes with verified mechanical properties and dimensional data. CE certification under EN 10210/EN 10219, ISO 9001:2015 registration, and SGS/BV inspection capability satisfy the documentation requirements for EU, North American, and Middle Eastern projects. Custom non-standard sizes and cut-to-length service reduce field waste, while professional loading plans optimize container utilization for overseas shipments to 50+ countries.
Documentation & Compliance
- Mill test certificate documenting S355JR chemical composition and mechanical properties per EN 10219, traceable to heat number
- CE certificate confirming compliance with EN 10210/EN 10219 for structural hollow sections exported to European markets
- ISO 9001:2015 quality management system certificate covering the full production and inspection process
- SGS or BV third-party inspection report available for projects requiring independent verification before shipment
- Material traceability documentation linking each bundle to its heat number and production batch
- Customs clearance package including packing list, bill of lading, and certificate of origin for destination port requirements
Packaging, Loading & Delivery
- S355JR ERW square tubes bundled with steel strips and edge protectors to preserve surface finish during ocean transit
- Galvanized option tubes packed with separation materials to prevent zinc coating damage from friction
- Custom length tubes cut to project specifications, reducing field cutting waste and handling costs
- Container loading plans optimized for square tube geometry, maximizing payload per shipment for cost efficiency
- Heat number and steel grade markings stenciled on each bundle for site identification and traceability
- FOB, CIF, and DDP shipping options with door-to-door logistics coordination to project sites across 50+ countries
How to Request a Quote for Your Structural Steel Requirements
Submit your specification sheet including square tube dimensions, wall thickness, steel grade (S235JR/S355/Q235B), quantity, and destination port. We respond within 12 hours with unit pricing, delivery timeline, and applicable certification documentation. For non-standard sizes or custom processing requirements, our technical team provides fabrication drawings and lead time confirmation before production begins.
Get Your High Quality ERW Welded Square Steel Pipe Factory Price Quote Today
Send your inquiry with specifications, steel grade, and quantity to receive pricing and mill test certificate samples.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: How do I select between S235JR, S355, and Q235B for my structural project?
A: S355JR provides higher yield strength for heavy-duty structural frames and moment-resisting systems. S235JR suits lighter construction where weight optimization matters. Q235B meets Chinese GB standards and is equivalent in performance to S235JR for most building applications. We provide grade equivalence charts and technical support to match your engineering specifications.
Q: Can you provide third-party inspection before shipment?
A: Yes, we coordinate SGS or BV inspections at our facility. The inspection covers dimensional verification, visual surface check, and witness of mechanical testing. Inspection reports are issued directly to your project team alongside our original mill test certificates.
Q: What is your policy on custom non-standard sizes?
A: We produce custom square tube sizes beyond standard catalogs, with minimum order quantities depending on specification complexity. Our 2,800+ specification range covers most standard requirements, and our technical team reviews non-standard requests within 24 hours with feasibility confirmation and pricing.
Q: Do you offer galvanized surface treatment for corrosion protection?
A: Yes, hot-dip galvanized coating is available as an optional surface treatment. Galvanized High Quality ERW Welded Square Steel Pipe Factory Price includes the coating process and is suitable for outdoor structural applications, infrastructure projects, and environments where field painting is impractical.
Q: How do you calculate invoicing weight — theoretical or actual?
A: We invoice by theoretical weight based on standard density calculations for the specified dimensions and steel grade. This provides predictable costing for project budgets. Actual weight verification is available through third-party inspection if your procurement policy requires it.
