Description
Factory-Direct ERW Square Tube Supply — Every S275JR ERW square steel tube rolls off our own production lines with original mill test certificates, eliminating trader markups and middleman delays.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S275JR ERW Square Steel Tube |
| Product Type | Square and Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | S235JR, S275JR, S355JR, S355J2H, S355J0, Q460, A36, SS400, ASTM A53 GR.B |
| Standard | EN 10210, EN 10219, ASTM A53 |
| Section Shape | Square / Rectangular |
| Size Range | 10×10 mm – 1200×1200 mm |
| Wall Thickness | 0.5 mm – 50 mm |
| Length | 5.8 m – 14 m (or custom) |
| Technique | ERW (Electric Resistance Welded) / Hot Rolled |
| Surface Treatment | Bare / Oiled / Painted / Varnish / Galvanized / 3PE / Coating |
| Tolerance | ±1% |
| Ends | Plain / Cutting / Threading / Beveled / Flange |
| Application | Urban & civil construction, machine structure, agriculture equipment, water & gas pipeline, greenhouse, scaffolding, building materials, furniture, low-pressure fluid transport, oil pipeline |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Civil & Commercial Construction | Structural frames, scaffolding systems, load-bearing columns, building material supports |
| Machinery & Equipment Manufacturing | Machine structure frames, agricultural equipment chassis, conveyor supports |
| Infrastructure & Pipeline | Water and gas pipeline networks, low-pressure fluid transport lines, oil transport pipelines |
| Agriculture & Greenhouse | Greenhouse structural frameworks, irrigation support structures |
| Furniture & Interior | Steel furniture frames, display rack structures, decorative structural elements |
Where Missing Mill Certificates Block Customs and Delay Structural Acceptance
A perfect-looking certificate means nothing if the heat number does not trace back to an independent lab report.
I watched a 20-ton shipment of S275JR SHS get rejected on-site after SGS testing pulled yield strength straight down into S235 territory. The mill certs looked flawless — printed on proper letterhead, stamped, the works. Three weeks of project downtime followed, and the buyer had no leverage because the supplier had vanished behind a trading company shell. When sourcing a S275JR ERW square steel tube for structural applications, the gap between paper compliance and actual material performance is where projects bleed money. Buyers across Southeast Asia and the Middle East routinely face fragmented sourcing — pipes from one vendor, plates from another, certificates that do not match the heat numbers on the bundled tubes [NEED_CITE: EN 10219 cold-formed hollow section dimensional and mechanical requirements].
Matching S275JR ERW Square Tube to Structural Load and Corrosion Environments
The S275JR grade sits at a practical midpoint for most structural frame applications — higher yield capacity than S235JR without the premium cost of S355JR, making it a default choice for warehouse frames, scaffolding uprights, and machinery bases. When the structure faces outdoor exposure or coastal humidity, selecting the right surface treatment — galvanized, 3PE coating, or painted — determines whether the S275JR ERW square steel tube holds its dimensional integrity over the design life or corrodes at the weld seam first. Our production lines run dedicated ERW tooling for square sections from 15×15 mm up to 1000×1000 mm, with wall thickness from 0.5 mm to 50 mm, so procurement teams can consolidate structural tubes, machinery frames, and pipeline sections in a single container load rather than splitting orders across three suppliers.
Engineering Compliance: EN 10210, EN 10219, and CE Marking for European and Gulf Markets
Structural hollow sections destined for European Union markets or Gulf Cooperation Council project sites require CE certification under EN 10210 (hot-finished) or EN 10219 (cold-formed ERW) — without it, customs authorities in Rotterdam, Hamburg, or Dubai will hold the container regardless of how competitive the unit price is [NEED_CITE: CE marking requirements for structural steel products under EU Construction Products Regulation]. The S275JR grade conforms to EN 10025-2 for non-alloy structural steel, and when produced as ERW square tube under EN 10219, it must pass hydrostatic testing, nondestructive weld inspection, and dimensional tolerance checks within ±1%. For projects designed to Eurocode 3 (EN 1993) or AISC 360, the specified steel grade, wall thickness, and tolerance class must all appear on the mill test certificate — any mismatch triggers re-inspection at the buyer’s cost. Custom cut-to-length service down to site-specific dimensions reduces on-site cutting waste and accelerates erection schedules, particularly for repetitive framing patterns in warehouse and greenhouse construction.
Steel Grade Selection and ERW Process: What S275JR Actually Delivers
The S-series steel grade system (S235JR, S275JR, S355JR, S355J2H) designates minimum yield strength at increasing levels — S275JR offers a meaningful step up in load-bearing capacity over S235JR for column and beam applications, while S355JR and S355J2H serve heavier structural demands where deflection limits are tighter. The “JR” suffix indicates impact testing at room temperature; “J0” and “J2H” extend impact requirements to sub-zero conditions, critical for projects in northern climates or refrigerated facilities. The ERW (Electric Resistance Welded) process forms the square cross-section from hot-rolled coil through progressive roll forming and resistance welding along the seam — this produces a consistent weld zone with mechanical properties comparable to the parent metal when properly controlled, at a cost advantage over seamless alternatives for non-high-pressure applications [NEED_CITE: comparison of ERW versus seamless steel tube manufacturing processes and pressure ratings]. Surface treatment choice directly affects service life: bare or oiled tubes suit indoor or temporary structures; hot-dip galvanized coating provides sacrificial zinc protection for outdoor and humid environments; 3PE coating delivers the highest corrosion resistance for buried or submerged pipeline applications. Wall thickness tolerance of ±1% means the actual weight per meter stays within predictable range — critical when structural engineers calculate dead loads and when procurement teams compare quoted prices on a per-ton basis rather than per-piece.
The Hidden Cost of Buying S275JR That Tests as S235
When a supplier delivers S275JR ERW square steel tube that fails independent verification — yielding S235-range mechanical properties despite carrying S275JR markings — the consequences cascade far beyond the material cost difference. Structural engineers must recalculate load capacity, potentially redesigning connections and foundations; project inspectors reject the batch and halt erection; customs authorities flag inconsistent documentation across future shipments from the same origin [NEED_CITE: consequences of steel grade misdeclaration in structural construction projects]. Missing or non-traceable mill test certificates create the same downstream risk: even if the material is physically correct, the absence of heat-number traceability means the structure cannot be certified for occupancy in most regulated markets. Negative tolerance abuse — where wall thickness consistently sits at the lower boundary — reduces actual load capacity and accelerates corrosion perforation, shortening design life without visible warning until failure.
Why Procurement Teams Consolidate ERW Square Tube Orders Through Our Production Lines
Our factory operates three dedicated ERW production lines running simultaneously, producing monthly capacity exceeding 20,000 tons across the full range of square and rectangular hollow sections — this means a single purchase order covering S275JR structural tubes, S355JR machinery frames, and galvanized pipeline sections ships in one consolidated container rather than three separate LCL bookings. Factory-direct pricing removes trading company margins, and volume discount programs activate for repeat procurement partners committing to annual purchasing above standard thresholds. Every batch rolls with original mill test certificates traceable to heat number, and third-party inspection through SGS or BV is available on request before container sealing — the same inspection protocol that caught the S235 substitution on that Riyadh warehouse project years ago. Our inventory covers 2,800+ standard specifications for immediate dispatch, while custom orders for non-standard dimensions or specific steel grades complete within typical production lead times. Professional export documentation handling covers CE certificates for European customs, certificates of origin for preferential tariff markets, and optimized container loading plans that maximize weight utilization for heavy-wall sections.
Documentation & Compliance
- Mill test certificate documenting S275JR chemical composition and mechanical properties per EN 10025-2, traceable to heat number
- CE certificate confirming EN 10219 compliance for cold-formed ERW structural hollow sections, required for European Union customs clearance
- ISO 9001:2015 quality management certificate covering production process control and inspection procedures
- SGS or BV third-party inspection report verifying dimensional accuracy, weld integrity, and mechanical test results before shipment
- Material traceability documentation linking each bundled tube to its heat number, production date, and test batch
- Complete customs document package including packing list, bill of lading, and certificate of origin for destination-country tariff claims
Packaging, Loading & Delivery
- ERW square tubes bundled with steel strips and edge protectors, sized to match wall thickness and outer dimension to prevent deformation during ocean transit
- Galvanized S275JR tubes packed with separation layers and moisture barriers to preserve zinc coating integrity throughout container shipping
- Container loading plans optimized by our export team for square section geometry, maximizing weight utilization for heavy-wall 50 mm tubes while respecting port crane limits
- Custom cut-to-length service available across the 5.8 m to 14 m range, with cut ends protected against corrosion for scaffolding and construction applications
- Heat number and steel grade stenciled on each bundle with weather-resistant marking, supporting on-site verification against mill test certificates
- FOB, CIF, and DDP shipping terms available with real-time tracking, serving steel traders and project buyers across 50+ countries
Requesting a Quote for S275JR ERW Square Tube
Submit your specification sheet — including outer dimension, wall thickness, total tonnage, steel grade, surface treatment preference, and destination port — and our team returns a detailed quotation within 12 hours, complete with factory-direct pricing, applicable volume discounts, and production lead time. For non-standard dimensions or mixed-container orders combining square tubes with plates, beams, or round pipes, we provide consolidated loading plans and single-point documentation. Confirm your certification requirements — CE EN 10219 for European markets, mill test certificates for project inspection — and we include the complete document package with your proforma invoice.
Frequently Asked Questions
Q: How does S275JR compare to ASTM A500 Grade B and Chinese Q345B in terms of steel grade equivalence?
A: S275JR (EN 10025-2) offers comparable yield strength to ASTM A500 Grade B and sits between Q235B and Q345B in the Chinese GB/T 1591 system. For structural applications, S275JR serves as a direct substitute in many engineering specifications, though formal equivalence requires verification against the specific project design code. Our mill test certificates document actual chemical composition and mechanical properties so your engineer can confirm compliance.
Q: Do you provide CE EN 10210 or EN 10219 certificates for European import clearance?
A: Yes. Our S275JR ERW square steel tubes carry CE certification under EN 10219 for cold-formed welded structural hollow sections. The CE certificate, along with the Declaration of Performance and mill test certificate, is included in the standard export documentation package for European Union destinations, ensuring customs clearance without delay.
Q: Can you produce non-standard square tube dimensions, and what is the MOQ for custom orders?
A: We produce custom square and rectangular tubes across the full range from 10×10 mm to 1200×1200 mm with wall thickness from 0.5 mm to 50 mm. The MOQ for standard specifications starts at 1 ton. Custom non-standard dimensions follow the same 1-ton minimum, with typical production lead times confirmed at quotation stage based on tooling availability.
Q: When should I specify galvanized versus bare or 3PE-coated surface treatment for S275JR square tubes?
A: Galvanized treatment suits outdoor structural applications, scaffolding, and coastal environments where zinc provides sacrificial corrosion protection. Bare or oiled tubes work for indoor machinery frames and temporary structures where surface treatment occurs after fabrication. 3PE coating delivers maximum corrosion resistance for buried pipelines and submerged applications. Our team recommends the appropriate treatment based on your project environment and design life requirements.
Q: How do you optimize container loading for mixed-size square and rectangular tube orders?
A: Our export team designs container loading plans based on the specific outer dimensions, wall thickness, and length of each item in your order. Heavy-wall thick sections are positioned to distribute weight evenly, while nested smaller sections fill void spaces around larger tubes. This optimization maximizes weight utilization per container, reducing per-ton shipping cost for bulk procurement.
Request S275JR ERW Square Steel Tube Pricing with Mill Test Certificates
Send your specification requirements — dimensions, wall thickness, steel grade, quantity, and destination — to receive factory-direct pricing and original mill test certificates within 12 hours.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxinjiyuan.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
