Description
Direct Mill Supply for Sharp Corner SHS & RHS — Every S275JR and S355J2H sharp corner square rectangular steel tube ships with original mill test certificates and EN10210 compliance documentation, sourced directly from our rolling lines without broker markups.
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 (SHS / RHS) |
| Steel Grade | S235JR, S275JR, S355JR, S355J0, S355J2H, Q460, ASTM A36, SS400, ASTM A53 GR.B |
| Standard | EN10210, EN10219 |
| Section Shape | Square / Rectangular (Sharp Corner 90°) |
| Size Range | Square: 15×15 mm – 1000×1000 mm; Rectangular: 20×30 mm – 600×800 mm |
| Wall Thickness | 0.5 mm – 50 mm |
| Length | 5.8 m – 14 m (or cut-to-order) |
| Technique | ERW (Electric Resistance Welded), Hot Rolled |
| Surface Treatment | Bare / Oiled / Painted / Varnish / Galvanized / 3PE / Coating |
| Tolerance | ±1% |
| Ends | Plain / Cut / Threaded / Beveled / Flanged |
| Application | Steel structures, construction frames, machinery, scaffolding, furniture, greenhouse, urban and civil construction, agriculture equipment, low pressure fluid transport |
| MOQ | 1 Ton |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Steel Fabricators | Structural welded frames, equipment base plates, column-to-beam connections requiring true 90° corner flush joints |
| Construction Companies | Scaffolding uprights, building material support tubes, urban civil construction profiles |
| Machinery Manufacturers | Conveyor structures, machine frame assemblies, hydraulic support columns |
| Agriculture Equipment | Greenhouse structural frames, irrigation support posts, equipment mounting brackets |
| Infrastructure Projects | Bridge handrail posts, sound barrier supports, low pressure fluid transport lines |
Why Corner Radius Tolerance Determines Weld Joint Integrity on Sharp Corner SHS
A sharp corner tube that fails to hold 90° forces fabricators to grind, fill, and re-weld every connection node.
When structural steel fabricators receive sharp corner square rectangular steel tube with inconsistent corner radii, the flush-fit joints they designed for become gapped misalignments. Welders spend hours compensating for corners that rounded beyond tolerance during forming, and inspectors flag connections that no longer match the engineered drawings. On Middle East infrastructure projects, I have seen entire column-to-beam assemblies rejected because the corner flatness deviation exceeded what the welding procedure specification allowed — not because the steel grade was wrong, but because the geometry was. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
Matching Sharp Corner Geometry to Structural Fabrication Demands
The 90° sharp corner on these SHS and RHS sections eliminates the rounded transition found in standard ERW tubes, allowing fabricators to achieve flush-contact joints without additional machining. For S355J2H grades used in load-bearing frames, this means the full cross-section bears directly at the connection point rather than relying on weld metal to bridge a radius gap. When we supply sharp corner square rectangular steel tube to steel fabricators working on equipment bases and column assemblies, the corner flatness is verified against EN10210 tolerance tables before dispatch, ensuring that cut-to-length sections arrive ready for direct fit-up.
Engineering Compliance and Surface Protection Selection
Structural applications governed by EN 1993 require documented material traceability and verified mechanical properties — the S355J2H grade designation itself indicates Charpy impact testing at −20°C, a specification that matters for outdoor infrastructure in cold climates. For corrosive environments such as agricultural greenhouses or coastal construction, galvanized or 3PE surface treatment extends service life without requiring post-fabrication coating. When sharp corner square rectangular steel tube is specified for pressure-containing or fluid transport roles, the combination of ERW weld integrity and EN10219 compliance provides the certification pathway needed for customs clearance in EU and Middle East markets. [NEED_CITE: steel grade equivalence mapping between EN 10210 and ASTM A500 standards]
Understanding Steel Grade Selection and ERW Forming Process
The S-series grades (S235JR, S275JR, S355JR, S355J0, S355J2H) follow a European designation system where the number indicates minimum yield strength in MPa, and the suffix denotes impact test temperature — JR for room temperature, J0 for 0°C, J2H for −20°C with guaranteed impact energy. The Q460 grade from the Chinese system and ASTM A36 / A53 GR.B from the American system serve equivalent structural roles, allowing procurement teams to source alternatives when project specifications permit cross-standard substitution. The ERW (Electric Resistance Welded) process forms the tube from flat coil by passing it through forming rolls and welding the seam through electrical resistance heating — this method produces sharp corners when followed by dedicated corner-forming stands that press the radius to 90°, unlike standard ERW which retains a natural radius from the forming rolls. Hot-rolled variants offer thicker wall options up to 50 mm for heavy structural applications where cold-formed sections reach their practical limits.
The Hidden Cost of Accepting Negative Tolerance on Structural Tubes
When mills push wall thickness to the lower boundary of permissible negative tolerance, the theoretical weight drops but so does the actual load-bearing capacity — a discrepancy that only surfaces during third-party inspection or structural load testing. Fabricators who discover thickness deviation after cutting face material rejection, project delays, and the cost of replacement shipments that could have been avoided with verified dimensional reports. Certification gaps compound the problem: tubes arriving without heat-number traceability or with questionable mill test certificates cannot pass EU customs under the Construction Products Regulation, leaving containers stranded at port while the procurement team scrambles for documentation. [NEED_CITE: Construction Products Regulation material traceability requirements for structural steel]
Procurement Confidence Through Verified Mill Documentation and Direct Supply
As a dedicated plate and coil division operating under ISO 9001:2015 quality management, we supply sharp corner square rectangular steel tube directly from our rolling partners with every piece backed by original mill test certificates showing chemical composition, mechanical properties, and heat number traceability. Our dimensional inspection reports cover corner radius, flatness, and wall thickness against EN10210 tolerance tables — not just nominal specifications. We hold ready stock across common S275JR and S355J2H specifications in square and rectangular sections, and our processing capability includes plasma cutting, leveling, and cut-to-length services that let fabricators order exact project quantities rather than full-length bundles. For international shipments, our logistics team handles flatbed, open-top container, and break-bulk loading with specific attention to heavy gauge SHS and RHS sections that require proper weight distribution to avoid container overweight penalties. Third-party inspection through SGS or BV is available for projects requiring independent verification before shipment.
Documentation & Compliance
- Mill test certificate documenting S275JR and S355J2H chemical composition, yield strength, and Charpy impact values per EN10219, with heat number traceability
- CE certificate confirming EN10210 and EN10219 compliance for structural hollow sections exported to EU markets
- ISO 9001:2015 quality management system certificate covering the full supply and inspection process
- SGS or BV third-party inspection report available for pre-shipment dimensional and visual verification
- Material traceability documentation linking each piece to its heat number, chemical analysis, and mechanical test results
- Export customs documents including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Sharp corner square rectangular steel tube bundled with steel strips and edge protectors to preserve 90° corner geometry during transit
- Galvanized surface treatment sections wrapped with moisture-resistant paper to prevent white rust formation during ocean shipping
- Cut-to-order lengths between 5.8 m and 14 m loaded into open-top containers with weight distribution plans to avoid overweight penalties on heavy gauge S355J2H sections
- Heat number and steel grade stenciled on each piece for on-site identification and traceability verification
- Bare and oiled surfaces protected with end caps to prevent moisture ingress and corrosion during storage at destination
- FOB, CIF, and DDP shipping terms available with professional heavy cargo logistics handling for break-bulk and flatbed transport
Starting Your Sharp Corner SHS & RHS Procurement
Submit your specification requirements including steel grade, section dimensions, wall thickness, length, quantity, and destination port to receive a detailed quotation with material cost, processing fees, and shipping terms. We provide mill test certificates for review before shipment and can arrange SGS or BV third-party inspection for projects requiring independent verification. Our processing team will confirm cut-to-length dimensions and end preparation details to ensure the sharp corner square rectangular steel tube arrives ready for direct fabrication.
Request Your Sharp Corner SHS & RHS Quotation
Send your specification sheet to receive pricing, mill test certificate samples, and delivery timelines within 12 hours.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjyplate.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: How do S275JR and S355J2H grades map to ASTM and GB standards?
A: S275JR corresponds roughly to ASTM A572 Grade 42 and GB Q345B in yield strength range, while S355J2H aligns with ASTM A572 Grade 50 and GB Q355C/D in both strength and low-temperature impact requirements. We provide detailed grade equivalence documentation for cross-standard procurement.
Q: Can I verify heat numbers and request third-party inspection before shipment?
A: Yes. Every sharp corner square rectangular steel tube ships with original mill test certificates showing heat number, chemical composition, and mechanical properties. SGS or BV third-party inspection can be arranged for pre-shipment dimensional and visual verification at our facility.
Q: What is the actual corner radius on your sharp corner tubes?
A: Our sharp corner forming process achieves 90° corners with radius dimensions controlled within EN10210 tolerance specifications. Dimensional inspection reports covering corner radius and flatness are provided with each shipment for quality verification.
Q: Can I order cut-to-length sharp corner tubes with small lot quantities?
A: Yes. Our minimum order quantity is 1 Ton, and we offer cut-to-length processing for sections between 5.8 m and 14 m. Custom end preparation including plain, beveled, threaded, or flanged ends is available based on your fabrication requirements.
Q: How are heavy gauge sharp corner tubes loaded to avoid damage?
A: Heavy gauge S355J2H sections in large dimensions up to 1000×1000 mm are loaded using open-top containers or flatbed transport with weight distribution plans and edge protectors to preserve corner geometry. Our logistics team has specific experience with heavy cargo loading for structural steel sections.
