Description
Factory-direct SHS supply, no trading markup — Own steel mill and fabrication workshop under one roof deliver S235JRH and S355JRH square hollow sections at mill price with full EN 10219 documentation.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S235JRH / S355JRH SHS Hollow Section Black Square Pipe |
| Product Type | Square Hollow Section (SHS) |
| Steel Grade | S235JRH, S355JRH, Q235B, ASTM A500, ASTM A53 Gr.B, S275, STK400 |
| Standard | ASTM A500, ASTM A53, EN 10219, EN 10210, GB/T 3091, DIN BS |
| Section Shape | Square |
| Size Range | 19 mm × 19 mm – 800 mm × 800 mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8 m / 6 m / 11.8 m / 12 m / Random Length |
| Technique | Welded / Seamless |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel structures, construction frames, building structures, curtain walls, support tubes, machinery, industrial platforms |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial Construction | Building columns, roof trusses, portal frames for warehouses and logistics centers |
| Industrial Infrastructure | Equipment support platforms, conveyor structures, mezzanine flooring systems |
| Architectural Facades | Curtain wall mullions, canopy frameworks, decorative structural elements |
| Energy & Utilities | Solar panel support structures, substation frameworks, pipeline support racks |
What Dimensional Tolerance Costs on a Structural Frame Order
A ±1% tolerance on side length and wall thickness prevents costly rework at the bolted connection stage.
When S235JRH S355JRH square hollow sections arrive on site with out-of-tolerance cross-sections, fabricators spend hours grinding weld preps or re-drilling connection plates. On a multi-story steel frame project, cumulative tolerance errors across dozens of beam-to-column joints can push the entire erection schedule back by weeks. Material traceability gaps make it worse — if the mill test certificate does not match the heat number stamped on the pipe, the inspector will reject the entire batch regardless of actual quality. [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional tolerance requirements]
Matching S355JRH SHS to Load-Bearing Frame Applications
For portal frame structures and multi-story building columns, S355JRH provides the higher yield strength needed to reduce member sizes while maintaining load capacity. The 19 mm × 19 mm to 800 mm × 800 mm range covers everything from light-gauge purlin supports to heavy main columns. Wall thickness from 1 mm to 30 mm allows engineers to optimize weight against structural demand. Our own mill produces these S235JRH S355JRH square hollow sections in both welded and seamless processes, so procurement teams can specify the manufacturing route that matches their project code requirements without switching suppliers.
Structural Code Compliance and Surface Protection Selection
Steel frame projects in the EU require EN 10219 compliance with CE marking for structural hollow sections, while North American projects specify ASTM A500 or ASTM A53. The S235JRH S355JRH square hollow section we supply meets EN 10219 for cold-formed welded sections and EN 10210 for seamless, covering most international project specifications. For outdoor or corrosive environments, hot-dip galvanized surface treatment extends service life significantly compared to black painting or bare finish. Plain ends arrive ready for site welding or mechanical connection, and 6 m / 12 m standard lengths minimize field splicing on typical building bay dimensions. [NEED_CITE: steel grade equivalence between EN 10219 and ASTM A500 standards]
Steel Grade Selection and Manufacturing Process Explained
The S-series grades (S235JRH, S275, S355JRH) follow the European EN standard system where the number indicates minimum yield strength in MPa — S355JRH carries roughly 50% higher yield than S235JRH, allowing smaller cross-sections for the same load. Q235B is the Chinese GB/T equivalent commonly specified on Belt & Road projects, while ASTM A500 Gr.B serves North American markets. Welded SHS (ERW process) offers cost efficiency for standard structural applications, while seamless hollow sections provide superior pressure integrity for mechanical and hydraulic uses. Surface treatment choice depends on the installation environment: black painting suits indoor dry conditions, hot-dip galvanizing protects outdoor or coastal structures, and bare finish works when the project applies its own coating system on site. Wall thickness tolerance of ±1% ensures that theoretical weight calculations match actual delivered weight, preventing budget overruns on tonnage-based contracts.
Hidden Costs of Procuring the Wrong Grade or Missing Certification
Specifying S235JRH when the structural design calls for S355JRH means the member will deflect under load — a failure that only surfaces during final inspection or worse, after occupancy. Conversely, over-specifying S355JRH where S235JRH suffices wastes material cost across hundreds of tons. Missing or non-conforming mill test certificates trigger customs holds at destination ports, particularly in the EU where CE marking under EN 10219 is mandatory for structural steel. [NEED_CITE: customs clearance requirements for structural steel imports into EU member states] Negative tolerance abuse — where actual wall thickness falls below the specified minimum — reduces load capacity and voids structural warranties, yet remains invisible until third-party inspection catches it.
Why Project Procurement Teams Source S235JRH S355JRH Square Hollow Section Here
Our vertically integrated operation means the same facility that produces the raw steel plate and coil also forms and welds the finished SHS — eliminating the material traceability gap that occurs when fabricators source pipe from third-party mills. We maintain over 2,800 specifications in stock across the full 19 mm × 19 mm to 800 mm × 800 mm range, so project teams do not need to split orders across multiple suppliers. Every S235JRH S355JRH square hollow section ships with EN 10204 3.1 mill test certificates documenting chemical composition and mechanical properties by heat number. Third-party inspection through SGS, BV, or TÜV is available for projects requiring independent verification. Our loading teams have handled oversized SHS shipments to over 50 countries, with specialized bracing and lashing plans that prevent transit deformation on long ocean voyages.
Documentation & Compliance
- Mill test certificate documenting S235JRH or S355JRH chemical composition and mechanical properties per EN 10219, issued per EN 10204 3.1 with heat number traceability
- CE certificate confirming EN 10219 cold-formed welded hollow section compliance for EU market structural applications
- ISO 9001 quality management system certificate covering the full production process from raw material to finished SHS
- SGS or BV third-party inspection report available upon request for projects requiring independent dimensional and material verification
- Material traceability documentation linking each bundle to its production heat number, welding records, and coating inspection reports
- Complete customs documentation package including packing list, bill of lading, and certificate of origin formatted for destination port requirements
Packaging, Loading & Delivery
- S235JRH S355JRH square hollow sections bundled with steel strips and edge protectors to preserve black painting or galvanized coating during ocean transit
- Small-section SHS (19 mm – 150 mm) packed in hexagonal bundles optimized for 20ft and 40ft container loading; large-section SHS (200 mm – 800 mm) loaded in bulk or flat rack for break-birth shipment
- Galvanized S355JRH SHS wrapped with waterproof paper and separated by rubber spacers to prevent zinc coating abrasion between adjacent tubes
- Standard lengths of 5.8 m and 6 m fit 20ft containers; 11.8 m and 12 m lengths ship in 40ft open-top or flat rack containers with wooden cradle support
- Each bundle tagged with heat number, steel grade (S235JRH / S355JRH), size, and length for site identification and inspection traceability
- FOB, CIF, and DDP terms available with professional loading plans for oversized SHS cargo to Middle East, Southeast Asia, Africa, and Latin American ports
How to Initiate Your SHS Procurement Inquiry
Submit your project drawings or bill of materials specifying steel grade (S235JRH / S355JRH / ASTM A500), cross-section dimensions, wall thickness, total tonnage, and destination port. Our engineering team responds within 24 hours with a detailed quotation including material cost, fabrication options, surface treatment, packing, and freight — along with the shop drawing timeline and mill test certificate sample. For projects requiring non-standard lengths or custom surface treatment, we provide technical recommendations based on your installation environment and local code requirements.
Request Your S235JRH S355JRH Square Hollow Section Quotation
Share your specifications and destination port to receive pricing, mill test certificates, and delivery schedule within one business day.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile / WhatsApp / WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Website: www.xjystructure.com
