Description
Direct Mill Supply — Every S355J0H rectangular hollow section tube rolls from our own ERW and seamless lines, shipped with full EN 10219 mill test certificates and no broker markup.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355J0H Rectangular Hollow Section Tube |
| Product Type | Rectangular Steel Tube (RHS) |
| Steel Grade | S355J0H, S235, S355, Gr.B, STK400 |
| Standard | ASTM A500, ASTM A53, EN 10219, EN 10210, GB/T 3091, ISO 10799-1 |
| Section Shape | Rectangular |
| Size Range | 15mm×20mm – 700mm×800mm |
| Wall Thickness | 1 – 50 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length |
| Technique | Welded (ERW) / Seamless |
| Surface Treatment | Galvanized / Black Painting / Bare |
| Tolerance | ±10% |
| Ends | Plain End |
| Application | Steel structures, Construction frames, Curtain wall framing, Machinery supports, Building structures |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Facade & Curtain Wall | Architectural steel framing for glass curtain walls, right-angle exposed columns, building envelope supports |
| Steel Structure Fabrication | Primary and secondary beam-to-column connections, truss chords, portal frame members |
| High-Rise Construction | Vertical load-bearing columns, transfer girders, core wall stiffeners |
| Machinery & Equipment | Conveyor frame uprights, crane boom extensions, heavy-duty equipment skids |
| Infrastructure & Civil Works | Bridge handrail posts, sound barrier supports, solar mounting structures |
Where Wall-Thickness Tolerance Decides Structural Acceptance on Site
A ±10% tolerance on a 50mm wall S355J0H rectangular hollow section tube means the difference between passing a third-party structural audit and tearing down a completed frame.
Project engineers specifying EN 10219 cold-formed hollow sections expect consistent load-bearing capacity across every batch. When wall thickness drifts beyond the declared tolerance, the theoretical weight no longer matches the actual weight — and the structural calculator’s safety margin evaporates. I have seen 11.8m long S355J0H rectangular hollow section tubes rejected at a Middle East high-rise site because the ultrasonic test revealed wall thinning near the weld seam that no visual inspection could catch [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional tolerances]. The cost of replacement was not just the steel — it was three weeks of crane time and a rescheduled facade closure.
Matching S355J0H Rectangular Hollow Section Tube to Facade and Structural Load Paths
The S355J0H grade delivers the yield strength range that facade engineers and structural fabricators need for moment-resisting frames without stepping into the cost bracket of S420 or higher. When a curtain wall contractor specifies a 200mm×100mm×8mm S355J0H rectangular hollow section tube for an exposed architectural column, the sharp-corner geometry produced by our patented forming process ensures the tube sits flush against the glass mullion — no visible rounding, no filler plates, no compromise on the architect’s sightline. Our 2,800+ specification range means the same supplier delivers the 15mm×20mm light-gauge framing members and the 700mm×800mm×50mm heavy structural columns in a single purchase order, eliminating cross-vendor tolerance mismatches.
Engineering Compliance: EN 10219, ASTM A500, and CE Marking for Regulated Markets
Structural hollow sections destined for the European Economic Area must carry CE marking under EN 10210 (hot-finished) or EN 10219 (cold-formed), with Declaration of Performance documentation traceable to each heat number [NEED_CITE: CE marking requirements for structural steel hollow sections under CPR Regulation 305/2011]. The S355J0H designation under EN 10219 confirms Charpy impact testing at 0°C — critical for projects in northern climates or unheated industrial structures where brittle fracture risk exists. For North American projects, the same tube can be supplied to ASTM A500 Gr.B or Gr.C, with mill test certificates cross-referencing chemistry and mechanical properties to the equivalent EN grade. Our in-house physical and chemical laboratory tests every heat before release, and Lloyd’s Register audits our EN 10210/10219 production lines annually to maintain CE certification validity.
Steel Grade Selection: S355J0H vs S235 vs Gr.B — What the Designation Actually Means
The “355” in S355J0H indicates the minimum specified yield strength in MPa — substantially higher than S235, making it the default choice for primary structural members in buildings over four storeys. The “J0” suffix confirms impact toughness tested at 0°C, while the “H” denotes hollow section product standard compliance. When a project specification calls for ASTM A500 Gr.C, the nearest EN equivalent is S355J0H or S355J2H depending on the required impact test temperature [NEED_CITE: steel grade equivalence mapping between EN 10219 and ASTM A500]. Our ERW welding process for S355J0H rectangular hollow section tubes uses high-frequency induction welding with inline ultrasonic seam inspection, ensuring the weld zone matches the parent metal’s mechanical properties. For projects requiring seamless construction — such as hydraulic cylinder barrels or high-pressure structural nodes — we supply the same S355J0H grade in seamless rectangular form, eliminating the weld seam entirely.
The Hidden Cost of Unverified Steel Grades and Missing Mill Certificates
Ordering S355J0H rectangular hollow section tubes from a supplier who cannot provide heat-specific mill test certificates creates a cascade of risk: customs authorities in the EU may detain the shipment without valid CE documentation, the project’s third-party inspector will flag missing traceability, and the structural engineer cannot sign off on load calculations without confirmed material properties [NEED_CITE: structural steel procurement documentation requirements under EN 10204]. A batch of tubes labelled S355J0H but actually produced from S235-grade strip will pass visual inspection and even basic dimensional checks — yet fail under the design load, forcing complete frame replacement. The cost of that failure is never just the steel price difference; it includes demolition, re-fabrication, project delay penalties, and reputational damage with the end client.
Why Project Procurement Teams Specify SD XJY Pipe for S355J0H RHS
Our three production lines cover the full 1mm to 50mm wall thickness range for S355J0H rectangular hollow section tubes, from 15mm×20mm small-section framing to 700mm×800mm heavy structural columns — all from a single mill with unified quality control. We hold 41 invention patents including China’s original sharp-corner rectangular tube technology, delivering true right-angle geometry for architectural facades where standard rounded-corner tubes are unacceptable. Every shipment includes mill test certificates generated by our own ISO-certified laboratory, with third-party SGS or BV inspection available before container sealing. Our Lloyd’s CE certification under EN 10210 and EN 10219 clears EU customs without delay, and our professional loading team uses layered timber separators and anti-sway bracing to prevent the bending and end-damage that plagued my early export shipments. We supply to construction companies, facade contractors, and steel fabricators across 50+ countries, with custom non-standard sizes available at low minimum order quantities.
Documentation & Compliance
- Mill test certificate documenting S355J0H chemical composition (C, Mn, Si, P, S, CEV) and mechanical properties (yield strength, tensile strength, elongation, Charpy impact at 0°C) per EN 10219, traceable to heat number
- CE certificate of conformity issued under EN 10210-1 / EN 10219-1 for structural hollow sections, valid for EU member state market access
- ISO 9001:2015 quality management system certificate covering cold-formed and hot-finished rectangular hollow section production
- SGS or BV third-party inspection report verifying dimensional accuracy, surface quality, and weld seam integrity before shipment
- Material traceability sheet linking each bundle to its heat number, production date, and test results for full audit trail compliance
- Export customs documentation including packing list, bill of lading, and certificate of origin formatted for destination-country import clearance
Packaging, Loading & Delivery
- S355J0H rectangular hollow section tubes bundled with galvanized steel straps at 1.5m intervals, with end caps protecting plain ends during ocean transit
- Galvanized surface tubes wrapped with waterproof paper and edge protectors to preserve zinc coating integrity and prevent white rust formation
- 6m and 11.8m fixed-length tubes loaded in 20ft and 40ft containers with timber layer separators and anti-sway bracing to prevent inter-layer friction damage
- Custom cutting to project-specific lengths available, with cut ends deburred and marked with heat number, steel grade S355J0H, and dimensional specification
- Each bundle labelled with weather-resistant tags showing purchase order number, heat number, steel grade, section size, wall thickness, and total bundle weight
- Shipping terms available FOB, CIF, or DDP to major ports worldwide, with container loading plans provided for client approval before sealing
Requesting a Quotation for Your S355J0H Rectangular Hollow Section Project
Submit your section dimensions, wall thickness, steel grade, surface treatment preference, total tonnage, and destination port — we respond within 12 hours with unit pricing, production lead time, and available mill test certificate formats. For non-standard sizes outside the 15×20 to 700×800mm range, our engineering team provides custom forming feasibility assessment and tooling cost confirmation within 48 hours.
Get Your S355J0H RHS Quote with Full Mill Documentation
Send your specification list to admin@sdxjypipe.com or contact us via WhatsApp at +86 188 5315 7756 for pricing, certification confirmation, and container loading plan review.
Frequently Asked Questions
Q: What is the steel grade equivalence between S355J0H and ASTM A500?
A: S355J0H per EN 10219 is broadly equivalent to ASTM A500 Gr.C in terms of minimum yield strength, though exact chemical composition limits differ between the EN and ASTM systems. We supply S355J0H rectangular hollow section tubes with dual-certified mill test certificates showing compliance to both standards when required for cross-border projects.
Q: Can you produce non-standard rectangular sizes outside your listed range?
A: Yes. Our 2,800+ specification range includes many non-standard dimensions, and our patented sharp-corner forming technology allows custom section sizes with low minimum order quantities. Submit your required outer dimensions and wall thickness for a feasibility check and tooling cost confirmation.
Q: What surface treatment options are available for S355J0H rectangular hollow section tubes?
A: We offer hot-dip galvanized, black painting, and bare (oiled or untreated) surface finishes. Galvanized is recommended for outdoor or corrosive environments, black painting suits indoor structural applications, and bare tubes are preferred when the fabricator will apply project-specific coating systems.
Q: Do your S355J0H tubes carry CE marking for EU import?
A: Yes. All S355J0H rectangular hollow section tubes produced to EN 10219 carry CE marking under the Construction Products Regulation, with Lloyd’s Register certification and Declaration of Performance documentation included in every EU-bound shipment.
Q: What is the tolerance on wall thickness for cold-formed S355J0H RHS?
A: Wall thickness tolerance is ±10% of the nominal value per EN 10219 for cold-formed rectangular hollow sections. Our in-house laboratory verifies every heat against this standard, and third-party SGS or BV inspection is available before shipment for projects requiring independent dimensional verification.
