Description
Factory-Direct Hot Dip Galvanized SHS/RHS — Every zinc coating thickness report is verified in-house before shipment, eliminating third-party rejection risks on solar and structural projects.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Hot Dip Galvanized Square and Rectangular Steel Tube |
| Product Type | Galvanized Square and Rectangular Steel Tube (SHS/RHS) |
| Steel Grade | Q195, Q235, Q345, 10#, 20#, 45#, 16Mn, ASTM A53 (Grade A/B), St37, St42, St35.4, St52.4, Grade B, Grade C, Grade D, Grade 50 |
| Standard | BS EN, GB, AISI, ASTM, DIN, JIS; API, CE, BSI, RoHS, SNI, BIS, SASO, PVOC, SONCAP, SABS, SIRM, TISI, KS, JIS, GS, ISO 9001 |
| Section Shape | Square / Rectangular |
| Size Range | 10mm – 1000mm (side length / outer diameter) |
| Wall Thickness | 0.6 – 28mm |
| Length | 1 – 12m |
| Technique | Hot Rolled / Cold Rolled / ERW |
| Surface Treatment | Hot Dip Galvanized / Pre-Galvanized / Bare / Oiled / Color Paint / 3PE / Other anti-corrosive treatments |
| Zinc Coating | 30 – 275g/m² |
| Ends | Plain / Beveled / Threaded with couplings or sockets; plastic caps and steel rings available |
| Application | Solar power structures / General engineering structures / Automotive / Bridges / Ships / Boilers / Pressure vessels / Construction frames / Machinery / Scaffolding |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Solar & Renewable Energy | Solar panel mounting frames, inverter support structures, cable tray supports for photovoltaic farms |
| EPC & Industrial Construction | Steel building frames, warehouse portal frames, pipe rack supports, bridge handrail posts |
| Machinery Manufacturing | Equipment base frames, conveyor system structures, crane boom sections, hydraulic cylinder housings |
| Infrastructure & Civil Engineering | Scaffolding uprights and ledgers, highway guardrail posts, tunnel ventilation supports |
| Marine & Shipbuilding | Deck handrail structures, cable routing conduits, non-critical pressure housings |
Where Zinc Coating Consistency Decides Project Acceptance or Rejection
A 45μm coating where 80μm was specified will fail on-site inspection — and re-galvanizing locally costs triple the original price.
I have watched Middle East solar EPC buyers receive full containers of galvanized rectangular tubes only to have them rejected at the project gate because the zinc layer failed third-party inspection. The root cause is almost always the same: the supplier shipped pre-galvanized material labeled as hot dip galvanized, or the coating thickness varied across batches without any mill-level verification. When a Hot Dip Galvanized Square and Rectangular Steel Tube is destined for a CE-marked European project or a SASO-regulated Saudi installation, inconsistent coating is not a cosmetic issue — it is a customs and compliance failure that delays the entire construction timeline. [NEED_CITE: hot dip galvanizing coating thickness requirements per ISO 1461]
Matching Galvanized SHS/RHS to Solar Mounting and Structural Frame Environments
Solar mounting structures demand a zinc coating that withstands decades of outdoor exposure without field maintenance. Hot dip galvanizing at 30–275g/m² provides a metallurgical zinc-iron bond that pre-galvanized coatings cannot replicate, making it the default choice for photovoltaic farms across Southeast Asia and the Middle East. Our Hot Dip Galvanized Square and Rectangular Steel Tube is produced across 2,800+ specification slots — including non-standard side lengths and wall thicknesses — so EPC contractors can consolidate structural tubes, purlins, and mounting rails from a single production source rather than coordinating five different suppliers.
Structural Compliance: EN 10219, ASTM A500, and the Certification Gap
Cold-formed welded structural hollow sections used in load-bearing frames across Europe must conform to EN 10219 dimensional and tolerance requirements, while North American projects reference ASTM A500 or ASTM A53. [NEED_CITE: EN 10219 cold-formed hollow section requirements] Specifying Q235 for a project that actually requires S235JR equivalence, or shipping without CE certification under EN 10210/10219, triggers customs holds at EU ports. Our production lines carry CE certification under EN 10210/10219, ISO 9001:2015, and Singapore FPC — meaning the Hot Dip Galvanized Square and Rectangular Steel Tube you order arrives with a documentation package that clears customs in 50+ destination countries without supplemental testing. [NEED_CITE: steel grade equivalence between EN and ASTM standards]
Steel Grade Selection: Q-Series, S-Series, and ASTM Equivalents in Galvanized Hollow Sections
The steel grades available for this product span three major international systems. Q195 and Q235 are Chinese standard carbon structural steels widely used in general engineering and scaffolding where extreme load capacity is not required. Q345 and 16Mn offer higher yield strength for bridge components and heavy machinery frames. On the European side, St37 and St42 (DIN equivalent) map closely to S235 and S275 under EN standards, while ASTM A53 Grade A/B serves North American plumbing and low-pressure structural applications. The ERW welding technique used for most of these tubes produces a consistent longitudinal weld seam suitable for cold-forming into square and rectangular profiles, and the hot dip galvanizing process coats both the external surface and the internal bore — a critical advantage over pre-galvanized tubes where the weld zone and inner surface remain vulnerable. Wall thickness from 0.6mm to 28mm covers everything from light-gauge solar purlins to heavy structural columns, and our proprietary sharp-corner rectangular tube technology ensures tight corner radii that improve connection plate fit-up and load transfer in moment-resisting frames.
The Hidden Cost of Unverified Galvanizing and Missing Mill Certificates
Ordering a Hot Dip Galvanized Square and Rectangular Steel Tube based on price alone, without confirmed zinc coating weight and original mill test certificates, exposes the project to three compounding costs: customs detention due to missing CE or SASO documentation, on-site rejection when coating thickness falls below the specified 80μm or 275g/m² threshold, and structural liability if the steel grade does not match the engineer’s calculation assumptions. [NEED_CITE: consequences of non-compliant steel imports in construction projects] Re-galvanizing a full container at the destination port typically costs three times the original galvanizing charge and adds weeks to the schedule. These are not theoretical risks — they are recurring problems in markets where buyers accept supplier declarations without independent lab verification.
Procurement Confidence: In-House Lab Verification and Full-Certification Export
Every batch of Hot Dip Galvanized Square and Rectangular Steel Tube leaving our Jinan facility passes through our in-house physical and chemical laboratory before shipment. Coating thickness is measured per sample, chemical composition is verified against the ordered steel grade, and mechanical test data is compiled into the mill test certificate. We hold 41 invention patents — including proprietary sharp-corner rectangular tube technology — and operate three dedicated production lines covering 2,800+ specifications. CE certification under EN 10210/10219, ISO 9001:2015, and Singapore FPC are maintained as standing credentials, and third-party inspection through SGS or BV is accepted on every order. For buyers in the EU, Middle East, and Southeast Asia, this means the Hot Dip Galvanized Square and Rectangular Steel Tube arrives with traceable heat numbers, verified coating data, and customs-ready documentation — not a declaration of conformity printed at the last minute.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345/ASTM A53 chemical composition and mechanical properties per ordered standard, with heat number traceability
- CE certificate under EN 10210/10219 for structural hollow sections destined for European Union member states
- ISO 9001:2015 quality management certificate covering the full production and galvanizing process
- SGS or BV third-party inspection report available upon request, verifying zinc coating thickness and dimensional tolerance
- Material traceability report linking each bundle to its heat number, steel grade, and galvanizing batch
- Full customs documentation package: packing list, bill of lading, certificate of origin, and SASO/PVOC/SONCAP certificates as required by destination country
Packaging, Loading & Delivery
- Hot dip galvanized tubes bundled with steel strips and edge protectors to preserve the zinc coating from abrasion during ocean transit
- Plastic end caps fitted on all tube ends to prevent moisture ingress and internal corrosion during storage and shipping
- Container loading plans optimized for 1–12m lengths across 10–1000mm section sizes, maximizing payload per 20ft and 40ft containers
- Custom cutting to project-specific lengths available, reducing on-site waste and secondary cutting labor for solar mounting and scaffolding applications
- Heat number and steel grade stenciled on each bundle for on-site identification and inspection traceability
- FOB, CIF, and DDP shipping terms available to 50+ countries, with professional port coordination and real-time shipment tracking
Getting Your Galvanized SHS/RHS Quotation Right the First Time
Submit your required section dimensions, wall thickness, steel grade, zinc coating specification, total tonnage, and destination port — we respond within 12 hours with a detailed quotation including unit price, delivery timeline, applicable certifications, and payment terms. For non-standard dimensions outside the 2,800+ catalog specifications, our engineering team provides a custom production assessment. Request original mill test certificates and third-party inspection options at the inquiry stage to confirm compliance before the contract is signed.
Frequently Asked Questions
Q: What is the difference between hot dip galvanized and pre-galvanized square and rectangular tubes?
A: Hot dip galvanizing immerses the finished tube in molten zinc, creating a metallurgical zinc-iron alloy bond that coats both the outer and inner surfaces with 30–275g/m² of zinc. Pre-galvanizing coats the steel strip before forming, leaving the weld seam and inner surface with thinner, less uniform coverage. Hot dip galvanized tubes are specified for outdoor structural and solar applications where long-term corrosion resistance is critical.
Q: Can you provide CE certification for galvanized hollow sections exported to the European Union?
A: Yes. Our Hot Dip Galvanized Square and Rectangular Steel Tube is produced under CE certification conforming to EN 10210 and EN 10219. The documentation package includes the CE declaration of performance, mill test certificates, and dimensional reports required for EU customs clearance and construction project compliance.
Q: What is the minimum order quantity for custom non-standard dimensions?
A: The standard MOQ is 1 Ton. For non-standard side lengths, wall thicknesses, or lengths outside the regular catalog range, our team will confirm production feasibility and MOQ based on your specific drawing or specification sheet.
Q: How do you ensure zinc coating thickness matches the order specification?
A: Every production batch is tested in our in-house physical and chemical laboratory. Coating thickness is measured using magnetic induction gauges per ISO 1461, and results are documented in the mill test certificate. Third-party inspection by SGS or BV is available for buyers who require independent verification before shipment.
Q: Which steel grade should I specify for a solar mounting structure in a coastal environment?
A: For coastal solar installations with high humidity and salt exposure, Q235 or Q345 steel with hot dip galvanizing at a minimum of 275g/m² zinc coating is typically specified. The combination provides structural strength and long-term corrosion protection. We can advise on the appropriate grade and coating weight based on your project environment and design life requirements.
Get Your Hot Dip Galvanized SHS/RHS Quotation with Full Mill Test Documentation
Send your specifications — section size, wall thickness, steel grade, zinc coating requirement, quantity, and destination port — to receive a detailed quotation and sample mill test certificate within 12 hours.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Email: admin@sdxjysteel.com
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Tel: +86 531 8573 6315
