Description
S275JR S355J2H Sharp Corner Square Rectangular Steel Tube EN10210 Manufacturer
Factory-Direct Sharp Corner Tubes — Every S275JR and S355J2H sharp corner square rectangular steel tube rolls off our own ERW lines in Jinan, shipped with original mill test certificates and no broker markup.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S275JR / S355J2H Sharp Corner Square and Rectangular Welded Steel Tube |
| Product Type | Sharp Corner Square and Rectangular Welded Steel Tube |
| Steel Grade | S235JR, S275JR, S355JR, S355J0, S355J2H, ASTM A53 GR.B, Q460, A36, SS400 |
| Standard | EN10210, EN10219 |
| Section Shape | Square / Rectangular |
| Size Range | 15×15 mm – 1000×1000 mm (Square) / 20×30 mm – 600×800 mm (Rectangular) |
| Wall Thickness | 0.5 mm – 50 mm |
| Length | 5.8 m – 14 m or as per order |
| Technique | Hot Rolled Carbon Steel Welded (ERW) |
| Surface Treatment | Galvanized, 3PE, Painting, Coating Oil, Steel Stamp, Bare |
| Ends | Plain ends, Cutting, Threading, Beveled, Flange |
| Tolerance | ±1% |
| Application | Urban/civil construction, Machine structure, Agriculture equipment, Water and gas pipeline, Greenhouse, Scaffolding, Building material, Furniture, Low pressure fluid transport, Oil pipeline |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Civil & Commercial Construction | Building frames, column structures, mezzanine supports, curtain wall skeletons |
| Infrastructure & EPC Projects | Bridge handrails, highway sound barriers, utility pole bases, station canopy frames |
| Industrial & Machinery | Machine frames, conveyor structures, equipment supports, crane booms |
| Agriculture & Greenhouse | Greenhouse skeletons, irrigation frameworks, livestock housing structures |
| Scaffolding & Temporary Works | Scaffolding uprights, cross braces, shoring towers, formwork supports |
What Wall-Thickness Tolerance Costs on a Sharp Corner Frame Order
A ±1% tolerance on a 5 mm S355J2H wall keeps the structural calculation valid — anything wider turns an engineered frame into a liability.
I have watched containers of sharp corner tubes get rejected at Ras Al Khaimah because the actual wall measured 4.2 mm against a 5 mm contract callout. The engineer signed off on S355J2H per EN10219; the mill shipped something closer to a decorative profile. Forty days in Jebel Ali, re-quotation, re-shipment, and a strained client relationship — all because nobody checked the caliper reading before the container doors closed. [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional tolerances] When buyers source a S275JR S355J2H sharp corner square rectangular steel tube manufacturer without verified in-house QC, specification gaps and missing traceability become the norm rather than the exception.
How 90° Sharp Corners Match Structural Connection Requirements
Sharp corner geometry eliminates the radius gap that round-corner tubes leave at moment connections. On a S355J2H building frame, the flat-to-flat contact at each 90° corner allows full-penetration welds or bolted splice plates to seat without filler shims — a detail that matters when an EPC contractor is assembling a station canopy in 40°C heat. Our ERW forming process holds the ±1% tolerance across side lengths up to 1000×1000 mm, so a S275JR S355J2H sharp corner square rectangular steel tube manufacturer delivering 300×300×12 mm columns arrives with corners that actually mate flush on the base plate.
Engineering Compliance Across EN, ASTM, and GB Frameworks
Structural designers working to EN 1993 expect hollow sections certified under EN10210 for hot-finished or EN10219 for cold-formed profiles. North American specs reference ASTM A500 Grade B or C, while Gulf region tenders often accept either framework provided the mill test certificate maps the chemistry and mechanicals correctly. [NEED_CITE: steel grade equivalence between EN and ASTM standards] S355J2H carries the J2 charpy impact requirement at −20°C, making it the default callout for outdoor structures in cold climates — a detail that separates it from S275JR on a spec sheet and from a generic “structural tube” on a purchase order. CE marking under EN10210/EN10219 with FPC certification clears EU customs without re-inspection delays, while SGS or BV third-party reports satisfy Middle East and African port authorities.
Steel Grade Selection and ERW Welding Logic
S235JR, S275JR, and S355JR represent ascending yield strength tiers within the EN non-alloy structural series — each step allows thinner walls for the same load, reducing tonnage per project. S355J0 and S355J2H add impact toughness at 0°C and −20°C respectively, critical for unheated outdoor frames. ASTM A53 GR.B and A36 serve equivalent roles in the US system, while Q460 and SS400 cover Asian procurement specifications. Our ERW welding process fuses the longitudinal seam under controlled heat input, producing a weld zone that matches the parent metal in tensile strength — essential when a S275JR S355J2H sharp corner square rectangular steel tube manufacturer is supplying scaffolding uprights that will see repeated load cycling. [NEED_CITE: ERW welded tube weld zone mechanical properties vs parent metal] Wall thickness from 0.5 mm to 50 mm spans light gauge furniture frames through heavy structural columns, and surface options — bare hot-rolled, galvanized, 3PE, painted, or oiled — match the corrosion environment from indoor greenhouse use to coastal infrastructure.
Hidden Costs When Material Traceability Breaks Down
Ordering a “structural tube” without specifying S355J2H per EN10219 and demanding an original mill test certificate tied to a heat number opens the door to grade substitution. A batch labeled S275JR that actually ships as Q195 will pass visual inspection but fail the structural engineer’s load calculation — and the failure shows up only when the building frame deflects under service load. [NEED_CITE: consequences of steel grade misidentification in structural applications] Missing CE documentation holds containers at EU ports; negative wall tolerance beyond the ±1% callout voids the engineer’s design assumptions. The rework cost — cutting out welded members, re-ordering, re-erecting — dwarfs any per-ton price saving from an unverified source.
Why Procurement Teams Return for Repeat Orders
Our three ERW production lines in Jinan run simultaneously, holding 2,800+ specifications in ready stock so that a trial order of 1 ton or a full-container bulk callout ships on the same timeline. Every S275JR S355J2H sharp corner square rectangular steel tube manufacturer claim we make is backed by our own理化实验室 producing original mill test certificates — not brokered paperwork. CE certification under EN10210/EN10219 with Lloyd’s verification and FPC factory production control means EU-bound containers clear customs with documentation in hand. For buyers needing non-standard sizes outside the 15×15 to 1000×1000 mm range, custom forming runs with typical production lead times and SGS/BV third-party inspection before loading. Professional export teams optimize container loading for mixed-size shipments — 5.8 m and 12 m lengths nested in the same 40ft open-top — reducing freight cost per ton for multi-project buyers across 50+ countries.
Documentation & Compliance
- Original mill test certificate documenting S275JR / S355J2H chemical composition, yield strength, and tensile properties per EN10219, traceable to heat number
- CE certificate confirming EN10210 / EN10219 compliance with FPC factory production control for EU market customs clearance
- ISO 9001:2015 quality management certificate covering the full ERW welding and forming process
- SGS or BV third-party inspection report available on request, covering dimensional checks, weld integrity, and surface coating thickness
- Material traceability by heat number stamped on each tube, matching the mill test certificate
- Full customs document package: packing list, bill of lading, certificate of origin, and commercial invoice
Packaging, Loading & Delivery
- S355J2H sharp corner tubes bundled with galvanized steel strips and edge protectors to preserve the 90° corner geometry during ocean transit
- Galvanized surface tubes wrapped with waterproof film and wooden cradles to prevent zinc coating abrasion inside the container
- Mixed-size container loading optimization: 5.8 m and 12 m lengths nested in 20ft and 40ft containers, maximizing tonnage per shipment for 15×15 mm through 1000×1000 mm ranges
- Cut-to-length service available for 5.8 m – 14 m standard lengths or project-specific dimensions, with beveled or threaded ends as specified
- Heat number and steel grade stenciled on each bundle, matching the mill test certificate for site traceability
- FOB, CIF, and DDP terms with door-to-door logistics coordination for construction sites and warehouse delivery
How to Move from Inquiry to Mill Test Certificate
Submit your specification sheet — section size, wall thickness, steel grade (S275JR / S355J2H or equivalent), quantity, and destination port — and receive a competitive bulk quotation with volume pricing within 12 hours. For non-standard dimensions outside the 15×15 to 1000×1000 mm range, share the drawing and we return a custom forming proposal with lead time. Confirm CE / EN10219 certification requirements and third-party inspection needs before contract signing, so the mill test certificate and SGS/BV report ship with the first container.
Frequently Asked Questions
Q: How do S275JR and S355J2H map to ASTM or GB equivalents for my project specification?
A: S275JR roughly corresponds to ASTM A572 Grade 40 and GB Q275, while S355J2H aligns with ASTM A572 Grade 50 and GB Q355D in yield strength tier. The J2 suffix indicates charpy impact testing at −20°C, which has no direct ASTM A500 equivalent — always confirm with the project engineer and provide the mill test certificate for grade mapping.
Q: What does the mill test certificate include, and can I request third-party re-inspection?
A: Every shipment carries an original mill test certificate documenting chemical composition (C, Mn, Si, P, S, and alloy elements) and mechanical properties (yield strength, tensile strength, elongation) per EN10219, traceable to the heat number. SGS or BV third-party inspection is available on request before container loading, covering dimensional tolerance, weld seam quality, and surface coating thickness.
Q: Can you produce non-standard sizes outside the 15×15 to 1000×1000 mm range?
A: Yes. Our three ERW production lines handle custom forming for sharp corner square and rectangular tubes beyond the standard catalog, with typical production lead times for non-standard dimensions. MOQ for custom runs starts from 1 ton, and we provide sample sections with mill test certificates for approval before full production.
Q: How do I choose between bare, galvanized, 3PE, and painted surface treatment?
A: Bare hot-rolled tubes suit indoor or painted applications where cost is the priority. Galvanized coating provides corrosion resistance for outdoor structures, greenhouses, and coastal environments. 3PE coating offers the highest protection for buried or submerged applications. Painted finishes match architectural color requirements. We advise based on the end-use environment and project specification.
Request Your Quotation with Mill Test Certificate
Send your S275JR / S355J2H sharp corner square rectangular steel tube specification — size, wall thickness, quantity, and destination — to receive factory-direct pricing and documentation confirmation within 12 hours.
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
