Description
Vertically Integrated Sharp Corner SHS & RHS — ERW and hot rolled sharp corner square and rectangular steel tubes produced from our own steel mill, with full heat-number traceability from coil to finished section.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235B / Q345B Sharp Corner Square and Rectangular Steel Tube |
| Product Type | Sharp Corner Square and Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q235B, Q345B |
| Standard | GB (GB/T 6728) |
| Section Shape | Square / Rectangular (Sharp Corner) |
| Size Range | Width 150–625 mm |
| Length | 5–15 m (Standard: 5.8 m / 6 m / 12 m) |
| Technique | ERW (Electric Resistance Welded) / Hot Rolled |
| Surface Treatment | Hot Rolled (Black / Oiled) |
| Tolerance | ±1% dimensional |
| Processing Service | Bending, Cutting, Decoiling, Punching, Welding |
| Invoicing | By Theoretical Weight |
| Application | Construction building, Steel structures, Industrial fabrication |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial & Industrial Construction | Steel frame columns, beams, and trusses for warehouse and factory buildings |
| Architectural Facades | Exposed structural profiles with sharp corner geometry for aesthetic curtain wall systems |
| Machinery & Equipment | Precision frames for modular industrial assemblies and conveyor support structures |
| Infrastructure | Platform structures, stairway supports, and bridge access frameworks |
Sharp Corner Geometry Eliminates the Gaps Standard Tubes Leave at Connections
Tight corner radii from precision ERW forming and hot rolling mean flush bearing surfaces at every bolted or welded joint.
When structural engineers specify sharp corner SHS/RHS for moment-resisting frames or architectural facades, standard rounded-corner tubes create a persistent problem: the gap between the tube face and the connecting plate forces fabricators to shim, grind, or redesign the joint. On a recent Middle East warehouse project, a batch of rounded-corner RHS arrived on site with corner radii exceeding 2.5t — the connection plates simply did not sit flat. The rework cost in cutting, re-fitting, and re-welding ran well into the fabrication schedule. [NEED_CITE: sharp corner hollow section dimensional requirements for structural connections] Sourcing a Sharp Corner Square and Rectangular Steel Tube Supplier who controls the forming process from raw coil eliminates this risk entirely — the corner profile is set at the mill, not guessed at a third-party yard.
How Sharp Corner Profiles Match Structural and Architectural Demands
Sharp corner square and rectangular steel tubes deliver flush contact surfaces that standard rounded-corner sections cannot achieve. For steel frame structures, this means bolted end-plate connections sit squarely without shimming, and welded moment connections achieve full-penetration joints without gap-filling compromises. In architectural facades, the crisp 90-degree corner line reads cleanly against glass and cladding — a detail that rounded tubes simply cannot replicate. As a Sharp Corner Square and Rectangular Steel Tube Supplier operating our own forming lines, we hold corner radii within tight process control, ensuring every section from 150 mm to 625 mm width meets the geometry your connection details demand.
Engineering Compliance and Certification for Global Delivery
Structural frames carrying Q235B and Q345B grades must meet the load-bearing and documentation requirements of the destination market. For EU projects, EN 10219 cold-formed welded structural hollow sections govern dimensional tolerance, weld integrity, and CE marking. [NEED_CITE: EN 10219 cold-formed hollow section requirements] North American specifiers cross-reference ASTM A500 and AISC 360 for equivalent performance. Our sharp corner SHS/RHS is produced under ISO 9001 quality management, with weld procedures qualified to international standards and full mill test certificates issued per batch. Surface treatment — black or oiled hot rolled finish — is selected based on the corrosion environment and the downstream coating system the fabricator will apply. Custom lengths from 5 m to 15 m reduce on-site cutting waste, and our in-house bending, punching, and welding services allow pre-fabricated delivery that accelerates erection sequences.
Steel Grade Selection and ERW Forming Process
Q235B and Q345B represent the two most widely specified structural grades in the Chinese steel system. Q235B serves general construction and non-critical load-bearing applications, while Q345B provides higher yield strength for heavier frame members, long-span trusses, and crane-supporting structures. [NEED_CITE: steel grade equivalence between Chinese GB and international EN/ASTM standards] The ERW (Electric Resistance Welded) process forms the flat strip into the target section shape through a series of precision rolls, then welds the seam under controlled pressure and current — producing a continuous weld line that is trimmed, inspected, and tested inline. For sharp corner profiles, the final forming passes are calibrated to produce near-90-degree corners rather than the generous radii typical of standard SHS/RHS production. Hot rolled surface treatment leaves a mill-scale black finish or oiled surface, both suitable for subsequent primer and topcoat application. Dimensional tolerance of ±1% on key section dimensions is verified through in-process measurement and final inspection reports.
The Hidden Costs of Sourcing Sharp Corner Tubes Without Verified Provenance
When a Sharp Corner Square and Rectangular Steel Tube Supplier cannot provide heat-number traceability back to the original coil, the project carries risks that surface only at inspection. Corner geometry that deviates from specification forces connection redesign. Material certificates that do not match the physical shipment trigger third-party inspector holds. Negative tolerance stacking on wall thickness reduces actual load capacity below the engineer’s calculation — a discrepancy that passes visual inspection but fails ultrasonic or dimensional audit. [NEED_CITE: structural hollow section tolerance compliance and inspection requirements] Each of these failures translates to shipment delays, air-freight rescue costs, or — in the worst case — structural safety concerns that require member replacement on site.
Why Project Teams Source Sharp Corner SHS/RHS From Our Mill
Our production begins with our own steel mill supplying the raw coil — there is no gap between material source and finished tube. This vertical integration means every Sharp Corner Square and Rectangular Steel Tube we deliver carries a mill test certificate traceable to a specific heat number, chemical composition, and mechanical test result. Our fabrication workshop handles CNC cutting, drilling, bending, and welding in-house, so projects receiving pre-fabricated components arrive with the same quality documentation as the raw material. We hold ISO 9001 certification, and our welding procedures and welders are qualified to AWS and EN standards. Third-party inspection by SGS, BV, or TÜV is welcomed at any production stage. For projects spanning multiple steel sections, our range of over 2,800 specifications allows consolidated sourcing from a single point of accountability — one contract, one quality system, one shipment.
Documentation & Compliance
- Mill test certificate documenting Q235B and Q345B chemical composition and mechanical properties per GB/T 6728, issued per heat number
- ISO 9001 quality management system certificate covering the full production chain from coil to finished sharp corner section
- Third-party inspection report from SGS, BV, or TÜV available for dimensional verification, weld seam testing, and surface coating assessment
- Material traceability sheet linking each bundle to its heat number, coil identity, and production date
- Export customs documentation including packing list, bill of lading, and certificate of origin for destination-country clearance
- Welding procedure specifications (WPS) and procedure qualification records (PQR) available for projects requiring certified fabrication
Packaging, Loading & Delivery
- Sharp corner Q235B and Q345B SHS/RHS bundled with steel strips and edge protectors to preserve the oiled black surface during ocean transit
- Standard lengths of 5.8 m, 6 m, and 12 m loaded to optimize 20ft and 40ft container capacity, with oversized sections up to 15 m shipped via open-top or flat-rack containers
- Heat number and steel grade stenciled on each bundle for on-site identification and traceability verification
- Custom cut-to-length service available within the 5–15 m range, with cut ends deburred and re-oiled to prevent edge corrosion
- FOB, CIF, and DDP shipping terms supported, with professional lashing and load-securing plans for heavy and oversized fabricated components
- Complete export documentation package prepared prior to dispatch, including packing lists matched to bundle-level heat numbers
Start Your Sharp Corner SHS/RHS Inquiry
Share your project drawings, section sizes, steel grades, and required quantities to receive a detailed quotation including material, fabrication, coating, packing, and shipping costs. We respond within 24 hours with a preliminary assessment and shop drawing timeline. Confirm your certification requirements — EN 10219, ASTM A500, or GB/T 6728 — and we will include the corresponding mill test certificate format and third-party inspection arrangement in the proposal.
Request a Quote With Full Mill Test Certification
Send your project specifications, required steel grades, and destination port to receive a detailed quotation with material traceability documentation.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
