Description
Vertically Integrated Galvanized SHS/RHS Supply — own steel mill and fabrication workshop under one roof, eliminating material traceability gaps across 2,800+ specifications.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square / Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q195, Q215, Q235, Q345, GR.A, GR.B, S235, S355 |
| Standard | ASTM A213, DIN EN 10217-1 |
| Section Shape | Square / Rectangular |
| Size Range | Wall thickness 0.8 – 30 mm |
| Length | 0.1 m – 11.8 m (customizable) |
| Technique | Welded (ERW) / Seamless |
| Surface Treatment | Pre-galvanized / Hot-dipped galvanized / Bare / Oiled / Black original |
| Tolerance | ±1% |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Invoicing | By Theoretical Weight |
| Application | Steel fence, Steel post, Steel construction, Warehouse construction, Building construction, Structure pipe |
| MOQ | 10 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Industrial Construction | Warehouse frames, factory column grids, mezzanine platforms |
| Infrastructure & Fencing | Highway guardrail posts, perimeter fencing uprights, boundary marker posts |
| Building Construction | Structural columns, roof truss bracing, load-bearing beam assemblies |
| Steel Structure Projects | Connection node tubes, portal frame members, purlin and girt systems |
Where EN 10219 Steel Grade Equivalence Decides Customs Clearance
Specifying S355J2H when your drawing calls for Q345 — or vice versa — can halt a shipment at the port.
Overseas buyers sourcing galvanized square steel tube from China frequently discover that the mill test certificate lists a domestic steel grade that does not appear on the EN or ASTM equivalence tables their inspector carries to site. When customs officers or third-party surveyors cannot cross-reference Q235 to S235JR, or Q345 to S355J2H, the entire container sits in bond while paperwork is corrected — costing demurrage, delayed crane schedules, and sometimes outright rejection. [NEED_CITE: steel grade equivalence between EN, ASTM, and GB standards for structural hollow sections]
As a Galvanized Square Steel Tube Supplier operating our own mill, we stamp every heat number onto the tube and issue MTCs that list both the Chinese designation and its EN 10219 / ASTM A500 equivalent, so your site engineer and your customs broker read the same document.
Matching Wall Thickness and Coating to Outdoor Structural Use
Galvanized square steel tube used for fencing posts and warehouse portal frames faces two simultaneous threats: mechanical impact during installation and atmospheric corrosion over a 20- to 30-year design life. Pre-galvanized (zinc-coated before forming) delivers a thinner, more uniform coating suited to indoor purlins and light-duty fencing, while hot-dipped galvanizing after fabrication provides the thicker zinc layer required for highway guardrail posts and coastal warehouse structures. Our ±1% wall-thickness tolerance ensures that the specified 3 mm nominal does not arrive at 2.6 mm — a gap that previously cost one of our Middle East clients a full batch rejection when calipers revealed the shortfall on site.
Structural Code Compliance and Certification Pathways
Engineering specifications for Galvanized Square Steel Tube in EU-bound projects typically reference EN 10219 for cold-formed welded hollow sections and EN 10210 for hot-finished profiles, both requiring CE marking and factory production control certification. North American tenders call for ASTM A500 Grade B or C, with mill test reports conforming to ASTM A6 requirements. [NEED_CITE: EN 10219 cold-formed structural hollow section compliance requirements] Our fabrication division holds EN 1090-2 EXC2/EXC3 certification for structural steel components, and every shipment of S235 or S355 grade tubes leaves Jinan with CE documentation, ISO 9001 quality records, and optional SGS or BV third-party inspection reports — ensuring that the Galvanized Square Steel Tube Supplier you contract with can close the compliance loop before the vessel sails.
Steel Grade Selection and ERW Welding Integrity
The Q-series (Q195, Q235, Q345) and S-series (S235, S355) designations both reference minimum yield strength in MPa, but differ in deoxidation practice, impact testing temperature, and elongation requirements. Q235 and S235JR serve general construction where low-temperature toughness is not critical; S355J2H adds a −20 °C Charpy impact requirement, making it the default for unheated warehouses in Northern Europe. [NEED_CITE: structural steel grade equivalence and impact testing temperature classes] Our ERW welding lines use high-frequency induction welding with inline ultrasonic seam inspection, and all welding procedure specifications are qualified per EN ISO 15614 — critical when the Galvanized Square Steel Tube will later be punched, bent, or welded into portal frames at the job site.
The Hidden Cost of Negative Tolerance on Invoiced Weight
When a supplier invoices by theoretical weight but delivers tubes at the lower edge of permissible negative tolerance, the buyer pays for steel that is not there. On a 40-foot container of 100 × 100 × 5 mm SHS at 11.8 m length, even a 5% wall-thickness shortfall translates to several hundred kilograms of missing material per container — and more importantly, a structural member that may fail dimensional inspection under EN 10219 Table 3. [NEED_CITE: EN 10219 dimensional tolerance limits for cold-formed hollow sections] We control this by measuring every coil’s actual thickness at the mill entry station and adjusting the ERW forming pass schedule accordingly, so the Galvanized Square Steel Tube you receive matches the MTC within ±1%.
Why Project Procurement Teams Source Through XJY Structure
We operate as a Galvanized Square Steel Tube Supplier with our own steel production facility running three rolling lines and over 2,800 stock specifications — meaning the coil that becomes your 150 × 150 × 6 RHS never leaves our site until it is cut, welded, galvanized, and bundled. This vertical integration eliminates the material traceability gap that occurs when a fabricator buys coil from a third-party mill and cannot guarantee heat-level chemistry when the inspector asks. Our engineering team reviews your shop drawings before production begins, optimizing nest layouts to minimize offcuts and confirming that the specified steel grade meets both your structural code and your destination country’s import requirements. We hold CE certification under EN 10210 and EN 10219, ISO 9001 registration, and arrange SGS, BV, or TÜV third-party inspections at our Jinan facility before shipment — so the Galvanized Square Steel Tube arrives at your port with a documentation package your site engineer can sign off without a second RFI.
Documentation & Compliance
- Mill Test Certificate documenting Q235 / S355 chemical composition and yield strength per EN 10219, with heat number traceability to the original coil
- CE certificate covering EN 10210 and EN 10219 compliance for hot-finished and cold-formed galvanized hollow sections
- ISO 9001 quality management certificate covering the full production chain from coil slitting through galvanizing and bundling
- SGS or BV third-party inspection report verifying wall thickness, zinc coating weight, and dimensional tolerances before container sealing
- Material traceability sheet linking each bundle’s heat number to coil chemistry, rolling date, and galvanizing bath record
- Full customs documentation package: packing list, bill of lading, certificate of origin, and CE Declaration of Performance
Packaging, Loading & Delivery
- Hot-dipped galvanized SHS and RHS bundled with steel strips and fitted with edge protectors to preserve the zinc coating during ocean transit and crane handling
- Pre-galvanized tubes wrapped in waterproof cloth with desiccant inserts, suitable for container shipment of 6 m and 11.8 m定尺 lengths
- Container loading plans optimized for 20ft and 40ft open-top or flat-rack units, maximizing payload for heavy-wall Q345 / S355 sections while respecting road weight limits at destination
- Custom cut-to-length service available from 0.1 m to 11.8 m, with each piece stamped with heat number, steel grade, and length for site identification
- Bundle identification tags printed with steel grade (e.g., S355J2H), size, heat number, and purchase order reference for immediate site verification
- FOB Qingdao, CIF, and DDP delivery terms available, with door-to-door logistics coordination for project sites across the Middle East, Southeast Asia, and Africa
Getting Your Galvanized SHS/RHS Quote Moving
Send your project drawings (PDF or DWG), specified steel grade, surface treatment preference, and destination port — we return a detailed quotation including material, fabrication, galvanizing, packing, and freight within 24 hours, along with a shop drawing timeline and production schedule. If your specification calls for non-standard dimensions or a steel grade equivalence confirmation between EN and ASTM systems, our engineering team will flag it before the contract is signed, not after the coil is rolled.
Frequently Asked Questions
Q: How do Q235 and S235JR compare for galvanized square steel tube applications?
A: Q235 and S235JR both reference a minimum yield strength of approximately 235 MPa and are widely used for general construction, fencing, and warehouse structures. The key differences lie in deoxidation practice and impact testing requirements — S235JR is specified under EN 10219 for European projects, while Q235 is the domestic Chinese equivalent. We supply both and provide MTCs showing the grade equivalence for customs and inspection clearance.
Q: What is the difference between pre-galvanized and hot-dipped galvanized square steel tube?
A: Pre-galvanized tubes are coated before forming, resulting in a thinner, more uniform zinc layer suitable for indoor or mild outdoor environments. Hot-dipped galvanized tubes are coated after fabrication, providing a thicker zinc coating that offers superior corrosion resistance for outdoor fencing, coastal structures, and industrial buildings. The choice depends on your project’s environmental exposure and design life.
Q: Can you supply non-standard sizes and what is the minimum order quantity?
A: Yes, we offer custom cut-to-length from 0.1 m to 11.8 m and can produce non-standard wall thicknesses within the 0.8 – 30 mm range. The minimum order quantity is 10 tons, which can be mixed across sizes and steel grades to suit project requirements.
Q: What certification documents are provided for EU market entry?
A: Every shipment to the EU includes a CE certificate under EN 10210 or EN 10219, a Mill Test Certificate with heat number traceability, ISO 9001 quality records, and a Declaration of Performance. Third-party inspection reports from SGS, BV, or TÜV are available upon request before shipment.
Q: How is invoicing calculated — by theoretical weight or actual weight?
A: We invoice by theoretical weight based on the specified dimensions and steel density, as is standard practice for structural hollow sections. Our ±1% wall thickness tolerance ensures that the actual weight closely matches the theoretical calculation, and every MTC documents the measured thickness at multiple points along the tube.
Request Your Galvanized SHS/RHS Quotation Today
Submit your project specifications, steel grade, and destination port to receive a detailed quotation and mill test certificate sample within 24 hours.
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
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
