Description
Factory-Direct Sharp Corner SHS/RHS — S355JR and S275JR sharp corner square rectangular steel tubes rolled in-house, shipped without trading margins.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355JR / S235JR / S275JR / S355J2 Sharp Corner Square & Rectangular Steel Tube |
| Product Type | Sharp Corner Square & Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | S235JR, S275JR, S355JR, S355J2H, S355J0H, ASTM A53 GR.B, Q460, A36, SS400 |
| Standard | EN10210, EN10219, ASTM A53, ASTM A500 |
| Section Shape | Square / Rectangular |
| Size Range | 15×15 mm – 1000×1000 mm (Square) / 20×30 mm – 600×800 mm (Rectangular) |
| Wall Thickness | 0.5 – 50 mm |
| Length | 5.8 – 14 m or custom |
| Technique | ERW / Hot Rolled |
| Surface Treatment | Galvanized / 3PE / Painted / Coating Oil / Bare / Steel Stamp |
| Ends | Plain / Cutting / Threading / Beveled / Flange |
| Tolerance | ±1% |
| Application | Urban & civil construction / Machine structure / Agriculture equipment / Water & gas pipeline / Greenhouse / Scaffolding / Building material / Furniture / Low pressure fluid transport / Oil pipeline |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors & Construction | Structural frames for high-rise buildings, scaffolding systems, bridge support columns, industrial warehouse frames |
| Machinery Manufacturers | Conveyor frames, equipment bases, hydraulic cylinder housings, crane boom sections |
| Agriculture & Greenhouse | Greenhouse skeleton tubes, irrigation pipeline supports, livestock shelter frames |
| Infrastructure & Pipeline | Low-pressure water distribution, gas pipeline casing, urban drainage structures |
What 90° Corner Tolerance Costs on a Structural Frame Order
A 6 mm radius on a bolted connection means the entire batch gets rejected at the site.
I watched a container of S355J2 sharp corner tubes arrive at a Dutch warehouse project. The R-angle measured over 6 mm instead of the specified sharp profile. Every bolt hole was misaligned. The contractor had three choices: re-drill 1,200 pieces, air-freight replacements, or eat the delay. None of them were cheap. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements] When your EN10210 S355JR sharp corner square rectangular steel tube supplier cannot hold a true 90° corner within ±1% tolerance, the cost never shows up on the invoice — it shows up on the construction schedule. Add to that missing mill test certificates or unverified steel grades, and customs holds turn into weeks of demurrage.
Matching Sharp Corner Profiles to Structural Connection Methods
Sharp corner SHS and RHS sections are specified when flat bearing surfaces matter — bolted end-plate connections, welded moment frames, and modular prefabricated assemblies where rounded corners create gaps that require expensive filler plates. Our EN10210 S355JR sharp corner square rectangular steel tube production uses proprietary forming dies that hold internal R-values below 3 mm even at 50 mm wall thickness, which means the tube sits flush against the gusset plate without additional machining. For EPC contractors assembling steel frames in Southeast Asia or the Middle East, this eliminates on-site grinding and reduces weld preparation time significantly.
Structural Compliance and Corrosion Protection Selection
Engineering specifications for sharp corner rectangular tubes typically reference EN 1993-1-1 for member resistance verification, and the steel grade must conform to EN 10219 for cold-formed welded hollow sections or EN 10210 for hot-formed sections. [NEED_CITE: EN 10219 steel grade equivalence between S355JR and ASTM A500 Grade B] For projects in coastal or industrial corrosion environments, hot-dip galvanized coating or 3PE wrapping extends service life without field painting. S355J2H grade with its 27J impact energy at -20°C is routinely specified for Nordic and Canadian infrastructure where low-temperature toughness is non-negotiable. Custom cut-to-length service at 5.8 m, 6 m, or 12 m reduces on-site welding joints and accelerates erection sequences.
Steel Grade Selection and Forming Process Fundamentals
The S-series structural steels — S235JR, S275JR, S355JR, S355J2H — follow the European EN 10025 designation where the number indicates minimum yield strength in MPa for thickness ≤16 mm. S355JR offers roughly 50% higher yield than S235JR, allowing lighter sections for the same load, which matters when shipping costs are calculated per container. The JR suffix denotes room-temperature impact testing, while J0 and J2 extend impact verification to 0°C and -20°C respectively. ERW (Electric Resistance Welded) forming is the dominant process for sharp corner rectangular tubes because it delivers consistent weld integrity at high production speeds, and our in-house physical and chemical laboratory verifies every heat against the EN10219 EN10210 S355JR sharp corner square rectangular steel tube chemical composition and mechanical property requirements before release.
Hidden Costs of Unverified Steel Grades and Missing Certificates
Purchasing sharp corner tubes from a supplier without verified mill test certificates creates a cascade of downstream failures. Material that fails to meet EN 10219 chemistry requirements will not pass third-party SGS or BV inspection at the destination port, triggering rejection or re-export at the buyer’s expense. [NEED_CITE: steel grade equivalence between EN and ASTM standards] Negative tolerance abuse — where wall thickness drifts below the specified minimum — reduces load-bearing capacity and voids structural engineer sign-off. The invoice looked competitive, but the real cost appears in re-inspection fees, project delays, and potential structural liability.
Why Project Procurement Teams Source From Our Mill
We operate three dedicated production lines for sharp corner rectangular tubes with proprietary forming technology that holds 41 invention patents — this is not a trading company reselling mill overruns. Every EN10210 S355JR sharp corner square rectangular steel tube order runs through our in-house physical and chemical laboratory for incoming raw material verification, in-process dimensional checks, and final mechanical testing before the mill test certificate is issued. Our product range covers 2,800+ specifications across square, rectangular, and round sections with wall thickness up to 50 mm, meaning EPC contractors can consolidate pipe, tube, and structural steel procurement into a single PO rather than managing five different vendors. We hold Lloyd’s Register EU CE certification under EN 10210 and EN 10219, Singapore FPC approval, and ISO 9001:2015 registration — documents that clear customs in EU member states without supplementary testing. For non-standard dimensions or custom lengths beyond the 5.8–14 m range, our mill accepts trial orders from 1 Ton MOQ, and our logistics team handles container optimization for heavy cargo with FOB, CIF, and DDP routing to 50+ countries.
Documentation & Compliance
- Mill test certificate documenting S355JR chemical composition (C, Mn, Si, P, S, CEV) and yield strength per EN 10219-2 for each heat number
- CE certificate under EN 10210 and EN 10219 issued by Lloyd’s Register for structural hollow sections exported to EU markets
- ISO 9001:2015 quality management certificate covering the full production process from raw material receipt to final inspection
- SGS or BV third-party inspection report available upon request for pre-shipment verification of dimensions, surface quality, and mechanical properties
- Full material traceability by heat number linking each tube to its corresponding mill test certificate and production batch record
- Customs documentation package including packing list, bill of lading, and certificate of origin formatted for destination port requirements
Packaging, Loading & Delivery
- Sharp corner S355JR rectangular tubes bundled with high-tensile steel strips and edge protectors to maintain 90° corner geometry during ocean transit
- Galvanized sharp corner SHS/RHS packed with waterproof interleave separators to prevent white rust formation on the zinc coating surface
- Container loading plans optimized for 20ft and 40ft open-top or flat-rack containers based on tube outer dimensions up to 1000×1000 mm and lengths up to 14 m
- Custom cut-to-length service available at 5.8 m, 6 m, 12 m, or project-specific dimensions to reduce on-site cutting waste
- Heat number and steel grade stenciled on each tube bundle with weather-resistant marking paint for site identification and traceability
- FOB Qingdao, CIF destination port, or DDP door-to-door delivery with real-time shipment tracking and full certificate package provided before vessel departure
How to Initiate Your Sharp Corner Tube Procurement
Send your specification sheet — including section dimensions, wall thickness, steel grade, total tonnage, and destination port — and our engineering team responds within 12 hours with a detailed quotation, applicable mill test certificate format, and estimated production lead time. For non-standard sharp corner profiles outside the 15×15 mm to 1000×1000 mm range, we provide custom die drawings and trial order pricing for your approval before full production.
Request Your EN10210 S355JR Sharp Corner Tube Quotation
Submit your project specifications via email or WhatsApp to receive pricing, mill test certificate samples, and container loading plans within one business day.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Frequently Asked Questions
Q: What is the steel grade equivalence between S355JR and ASTM standards?
A: S355JR under EN 10219 roughly corresponds to ASTM A572 Grade 50 in yield strength, though chemical composition limits differ slightly. For projects requiring dual certification, our mill can produce to both EN and ASTM specifications simultaneously, and the mill test certificate will document compliance with the requested standard.
Q: Can you produce non-standard sharp corner rectangular sizes outside your catalog range?
A: Yes. Our 2,800+ specification range covers standard sizes from 15×15 mm to 1000×1000 mm square and 20×30 mm to 600×800 mm rectangular. For dimensions outside these ranges, we offer custom die development with a minimum trial order of 1 Ton. Send your drawing or dimension sheet for feasibility assessment.
Q: How do you verify the sharp corner R-angle tolerance?
A: Every production batch undergoes dimensional inspection in our in-house physical laboratory using calibrated corner radius gauges and coordinate measuring equipment. The mill test certificate and inspection report document the measured R-values, and third-party SGS or BV verification is available for pre-shipment confirmation.
Q: What surface treatment options are available for sharp corner rectangular tubes?
A: We offer hot-dip galvanized coating for corrosion resistance in outdoor and marine environments, 3PE anti-corrosion wrapping for buried pipeline applications, painted or epoxy-coated finishes for architectural exposure, and bare or oiled surfaces for indoor structural use. The choice depends on your project’s corrosion environment and service life requirements.
Q: What documentation do you provide for EU customs clearance?
A: Every shipment to EU member states includes the CE certificate under EN 10210 or EN 10219 issued by Lloyd’s Register, mill test certificates per EN 10204 3.1, packing list, bill of lading, and certificate of origin. Singapore FPC certification is also available for Southeast Asian projects. All documents are provided in English and formatted for destination port requirements.
