Description
Full-Range Factory Direct Supply — Galvanized square and rectangular tubes from 10 mm to 1000 mm side length, wall thickness up to 28 mm, shipped with full mill test certificates and CE/EN compliance documentation.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square Steel Tube |
| Product Type | Galvanized Square / Rectangular Steel Tube |
| Steel Grade | Q195, Q215, Q235, Q345, 10#, 20#, 45#, 16Mn, ASTM A53 (Grade A/B), St37, St42, St35.4, St52.4, ASTM A500 (Grade B/C/D/50) |
| Standard | EN 10219, EN 10210, ASTM A500, ASTM A53, JIS G3466, GB/T 6728, DIN, BS |
| Section Shape | Square / Rectangular |
| Size Range | 10 mm – 1000 mm (customizable) |
| Wall Thickness | 0.6 mm – 28 mm (customizable) |
| Length | 1 m – 12 m (customizable) |
| Technique | ERW / Hot Rolled / Cold Rolled |
| Surface Treatment | Hot-Dip Galvanized (Zinc Coating 30–275 g/m²), PVC Coated, Black, Color Painted, Oiled, 3PE |
| Ends | Plain, Beveled, Threaded with Couplings/Sockets (plastic caps and steel rings available) |
| Application | Solar power support structures, steel structures, construction frames, machinery, bridges, ships, boilers, pressure vessels, general engineering structures, automotive manufacturing |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Solar Energy | Solar panel racking systems, mounting frames, ground screw supports, tracker post structures |
| Construction & Infrastructure | Building frames, warehouse columns, bridge railings, scaffolding uprights, industrial platforms |
| Machinery & Automotive | Conveyor structures, equipment frames, automotive chassis components, crane booms |
| Steel Structure Fabrication | Portal frames, truss members, purlin supports, connection brackets |
What Missing CE Markings Cost on a Galvanized Tube Shipment to the EU
Customs rejection at destination port is the single most expensive line item that never appears on a quotation.
Procurement teams sourcing Hot-Dip Galvanized Square Steel Tube for European projects frequently discover — after the container has already sailed — that the mill test certificate references a standard not recognized under EN 10219, or that the CE mark is absent entirely. The zinc coating may meet the weight requirement, but without the correct declaration of performance, the shipment cannot clear customs. [NEED_CITE: EN 10219 cold-formed structural hollow sections compliance requirements] Beyond customs delays, inconsistent zinc thickness across batches leads to uneven corrosion behavior on solar stent frames exposed to coastal or industrial atmospheres — a failure mode that surfaces months after installation, not at the loading dock.
Matching Zinc Coating Weight to Solar Stent Corrosion Environments
Galvanized square and rectangular tubes used in solar mounting structures face fundamentally different corrosion challenges depending on site conditions. A ground-mounted solar farm in a coastal Southeast Asian province demands a zinc coating at the upper end of the 30–275 g/m² range, while an indoor industrial racking system may perform adequately with a lighter coating. Our Hot-Dip Galvanized Square Steel Tube production covers this full spectrum — and because we control the galvanizing line in-house, we can match coating weight to the specific environmental classification of each project rather than defaulting to a single specification. For solar stent applications where structural members are cut and drilled on-site, the zinc layer must remain intact at cut edges; this is where coating thickness consistency becomes a structural concern, not just a cosmetic one.
Structural Compliance and Grade Equivalence Across Procurement Regions
Engineering specifications for solar support structures and steel frames typically call out load-bearing requirements referencing EN 1993 or AISC design codes. The Hot-Dip Galvanized Square Steel Tube we produce covers steel grades that map across these systems: Q235 and Q345 from the GB system correspond functionally to S235/S275/S355 under EN 10219, while ASTM A500 Grade B and C serve North American structural specifications. [NEED_CITE: steel grade equivalence mapping between GB, EN, and ASTM standards for structural hollow sections] Wall thicknesses up to 28 mm accommodate both light-gauge solar purlin members and heavy structural columns. For EU-bound shipments, our tubes carry Lloyd’s CE certification under EN 10210 and EN 10219, ensuring that the declaration of performance accompanies every container. Custom non-standard sizes are available with low MOQ, allowing fabricators to order exact dimensions rather than accepting catalog limitations.
Understanding ERW Welding, Steel Grade Selection, and Hot-Dip Galvanizing for Structural Tubes
The ERW (Electric Resistance Welding) process used to produce our Hot-Dip Galvanized Square Steel Tube creates a longitudinal weld seam through localized heating and pressure — without filler metal. This method delivers tight dimensional tolerance on square and rectangular sections, which is critical when tubes must slot into prefabricated connection nodes on solar racking systems. Cold-rolled strip input provides a smoother surface before galvanizing, improving zinc adhesion and coating uniformity.
Steel grade selection directly governs load-bearing capacity. Q195 and Q215 serve light-duty applications such as signage frames and non-structural enclosures. Q235 and its EN equivalent S235JR handle standard building frames and machinery bases. Q345 (S355JR/S355J2) provides higher yield strength for structural columns, bridge components, and heavy-duty solar stent posts where wind and snow loads drive design decisions. ASTM A500 Grade B/C/D grades serve the same tier in North American specifications. [NEED_CITE: structural hollow section steel grade selection criteria for load-bearing applications]
Hot-dip galvanizing immerses the finished tube in molten zinc, creating a metallurgical bond that produces a coating of 30–275 g/m². This coating provides cathodic protection — even if the surface is scratched during transport or fabrication, the surrounding zinc sacrifices itself to protect the base steel. For projects in aggressive environments, PVC coating or 3PE over-galvanized finishes add an additional barrier layer.
The Hidden Costs of Procuring Galvanized Tubes Without Verified Grade and Coating Data
Ordering Hot-Dip Galvanized Square Steel Tube based on price alone, without verified mill test certificates and independent coating weight measurement, introduces risks that compound through the project lifecycle. A tube stamped Q235 but actually produced from lower-grade strip will deflect under design loads — a failure that may not manifest until after the solar array is commissioned or the building is occupied. [NEED_CITE: consequences of non-conforming structural steel in construction projects] Zinc coating below the specified g/m² threshold accelerates corrosion at cut edges and weld points, shortening service life and triggering premature maintenance. Missing or incorrect CE documentation blocks customs clearance in EU markets, stranding cargo at port while demurrage charges accumulate. These are not theoretical scenarios — they are recurring procurement failures that trace back to insufficient verification at the sourcing stage.
Why Project Procurement Teams Specify Xin Jiyuan for Galvanized Structural Tubes
Xin Jiyuan operates three dedicated production lines covering 2,800+ specifications in square, rectangular, and round hollow sections — including wall thicknesses up to 40 mm for heavy structural applications. Our in-house physical and chemical laboratory tests every heat for dimensional accuracy, mechanical properties, and chemical composition before release. We hold 41 invention patents, including China’s original sharp-corner rectangular tube technology, which delivers true 90-degree corners for architectural facades and precision connection details. Full international certifications — ISO 9001:2015, Lloyd’s CE under EN 10210/EN 10219, Singapore FPC, and SGS/BV third-party verification — accompany every export shipment to 50+ countries. Custom non-standard sizes, cutting, marking, and professional container loading with anti-damage bracing are standard — not optional extras.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and mechanical properties per GB/T 6728 or EN 10219, issued per heat number
- CE certificate of conformity under EN 10210 and EN 10219 for structural hollow sections destined for EU member states
- ISO 9001:2015 quality management system certificate covering design, production, and inspection of galvanized welded tubes
- SGS or BV third-party inspection report verifying zinc coating weight, dimensional tolerance, and surface quality prior to shipment
- Material traceability by heat number linking each bundle to its original mill test certificate and production batch record
- Full customs documentation set: commercial invoice, packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Hot-dip galvanized tubes bundled with steel strips and edge protectors to preserve the zinc coating from abrasion during ocean transit
- Seaworthy packaging with waterproof wrapping available for Q235/Q345 galvanized square tubes in 6 m and 12 m standard lengths
- Container loading optimized by side-length grouping — 1000 mm sections loaded flat with timber separators, smaller sections nested to maximize 40HQ payload
- Custom cutting to project-specified lengths within the 1 m – 12 m range, with plastic end caps fitted to protect threaded or beveled ends
- Heat number and steel grade stenciled on each tube bundle for on-site traceability and inspection verification
- FOB, CIF, and DDP shipping terms available with professional tube loading plans signed off before container sealing
Requesting a Quotation with Full Compliance Documentation
Submit your Hot-Dip Galvanized Square Steel Tube requirements — including side dimensions, wall thickness, steel grade, zinc coating weight, total quantity, and destination port — to receive a detailed quotation with lead time, shipping terms, and sample mill test certificates. For non-standard sizes or custom lengths outside the standard range, our engineering team provides fabrication drawings and MOQ confirmation. Third-party inspection by SGS or BV can be arranged prior to shipment for projects requiring independent verification.
Frequently Asked Questions
Q: How do Q235 and Q345 steel grades map to ASTM A500 and EN 10219 equivalents?
A: Q235 corresponds functionally to S235JR under EN 10219 and shares similar chemical and mechanical characteristics with ASTM A500 Grade B. Q345 maps to S355JR/S355J2 under EN standards and ASTM A500 Grade C/D. We provide full grade equivalence documentation with each shipment to support customs clearance and engineering approval.
Q: What is the difference between 30 g/m² and 275 g/m² zinc coating, and which suits solar stent applications?
A: Zinc coating weight determines corrosion resistance duration. A 30 g/m² coating suits indoor or short-term applications, while 275 g/m² provides long-term outdoor protection for solar mounting structures exposed to rain, humidity, and coastal salt air. We produce Hot-Dip Galvanized Square Steel Tube across the full 30–275 g/m² range and can recommend coating weight based on your project’s environmental classification.
Q: Can you produce non-standard side lengths or wall thicknesses, and what is the MOQ?
A: Yes. Custom dimensions outside the standard 10–1000 mm side length and 0.6–28 mm wall thickness range are available. The MOQ for custom non-standard sizes is 1 Ton. We maintain 2,800+ specifications in our production system, covering most standard and near-standard sizes from stock.
Q: Do your galvanized tubes carry CE marking for EU import, and what documents are provided?
A: All Hot-Dip Galvanized Square Steel Tube shipped to EU markets carry CE certification under EN 10210 and EN 10219, issued by Lloyd’s Register. Each shipment includes the CE declaration of performance, mill test certificate, and full customs documentation. Singapore FPC certification is also available for Southeast Asian projects.
Q: How are galvanized tubes packed to prevent surface damage during container shipping?
A: Galvanized tubes are bundled with steel strips, separated by timber battens, and fitted with edge protectors to prevent zinc coating abrasion. For long-length tubes (6 m and 12 m), we use specialized loading plans that distribute weight evenly and prevent shifting during ocean transit. Every container loading plan is personally reviewed before sealing.
Get Your Galvanized Tube Quotation with Mill Test Certificates
Send your Hot-Dip Galvanized Square Steel Tube specifications — dimensions, steel grade, coating weight, quantity, and destination — to receive a detailed quotation, sample mill test certificates, and compliance documentation within 12 hours.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjypipe.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
