Description
Mill-Direct Galvanized SHS/RHS Supplier — Hot-dipped square and rectangular tubes produced from our own steel mill output, eliminating third-party material sourcing and ensuring full heat-number traceability from raw coil to finished zinc coating.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235B/Q345B Galvanized Square and Rectangular Steel Tube |
| Product Type | Galvanized Square and Rectangular Steel Tube (SHS/RHS) |
| Steel Grade | Q195, Q215, Q235, Q345, 10#, 20#, 45#, 16Mn, A53 (A/B), St37, St42, St35.4, St52.4, ASTM A500 (Grade B/C/D) |
| Standard | BS EN, GB, AISI, ASTM, DIN, JIS, ISO9001 |
| Section Shape | Square / Rectangular |
| Size Range | 10mm – 1000mm |
| Wall Thickness | 0.6 – 28mm |
| Length | 1 – 12m or customized |
| Technique | ERW (Hot Rolled or Cold Rolled) |
| Surface Treatment | Hot-Dip Galvanized (Zinc Coating 30–275g/m²), PVC, Black/Color Painting |
| Ends | Plain / Beveled / Threaded with Couplings or Sockets |
| Application | Solar power stents/support structures, General engineering structures, Construction frames, Bridges, Machinery, Steel structures, Furniture |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Solar Energy | Solar panel mounting frames, ground screw piles, racking support columns |
| Construction | Building column frames, mezzanine structures, warehouse roof trusses |
| Infrastructure | Bridge handrails, highway sign gantries, utility pole bases |
| Industrial | Machinery frames, conveyor support structures, platform decking |
| Steel Structures | Portal frame connections, bracing members, purlin systems |
Where Zinc Coating Thickness Decides Solar Project Lifespan
Hot-dip galvanizing at 30–275g/m² determines whether your solar stents survive 25 years in coastal or industrial atmospheres.
When sourcing Hot Dipped Galvanized Square and Rectangular Steel Tube for solar mounting systems, buyers often face inconsistent coating reports from trading companies who cannot verify zinc adhesion or thickness uniformity on internal corners. Pre-galvanized tubes may look acceptable at shipment but corrode within months at cut edges or weld points. [NEED_CITE: hot-dip galvanizing coating thickness standards for solar mounting structures]
Matching Galvanized SHS/RHS to Solar Racking and Structural Frames
Solar mounting structures demand square and rectangular tubes that combine dimensional accuracy for bolt-on assembly with corrosion resistance for decades of outdoor exposure. Our Hot Dipped Galvanized Square and Rectangular Steel Tube meets these requirements through ERW production with tight side-length tolerance and full immersion galvanizing that coats both external and internal surfaces. The Q235B and Q345B grades provide adequate yield strength for typical solar racking loads while maintaining weldability for on-site modifications.
Engineering Compliance and Certification Requirements
Structural applications require Hot Dipped Galvanized Square and Rectangular Steel Tube that conforms to recognized standards for dimensional tolerance and material certification. Our tubes meet BS EN, GB, AISI, ASTM, DIN, and JIS requirements depending on your project specification. For EU projects, CE marking per EN 10210/EN 10219 ensures customs clearance and engineering approval. [NEED_CITE: EN 10219 cold-formed structural hollow section compliance] Steel grade selection between Q235B, Q345B, or ASTM A500 grades should match your structural engineer’s load calculations and local building codes.
Steel Grade Selection and ERW Welding Process
The Q-series grades (Q195–Q345) follow Chinese GB standards where the number indicates minimum yield strength in MPa, while ASTM A500 grades (B/C/D) serve North American structural applications. Our ERW welding process produces square and rectangular tubes from hot-rolled or cold-rolled coil with continuous longitudinal weld seams suitable for structural loading. Hot-dip galvanizing after forming ensures complete zinc coverage including the weld zone, providing superior corrosion protection compared to pre-galvanized sheet-formed tubes. Wall thickness from 0.6mm to 28mm covers light gauge furniture frames through heavy structural columns.
Hidden Costs of Incorrect Material Sourcing
Purchasing Hot Dipped Galvanized Square and Rectangular Steel Tube without verified mill test certificates risks material substitution where actual steel grade does not match documentation. Engineering inspectors reject shipments when coating thickness falls below specified 30–275g/m² range or when dimensional tolerance exceeds standard limits. [NEED_CITE: consequences of non-compliant steel materials in structural projects] Customs authorities in EU and Middle East markets increasingly require EN 10204 3.1/3.2 certificates with full chemical composition and mechanical test results.
Why Source Galvanized SHS/RHS From Our Integrated Mill
Our facility operates three production lines for raw steel and maintains over 2,800 specifications of square and rectangular tube inventory, enabling single-source procurement from material production through final galvanizing. We provide complete quality documentation including mill test certificates with heat number traceability, dimensional inspection reports, and coating thickness measurements. Our engineering team reviews shop drawings for material optimization and fabrication sequencing. Professional loading plans maximize container utilization for 1–12m lengths while protecting galvanized surfaces during ocean transit. Third-party inspection by SGS or BV is welcomed for every shipment.
Documentation & Compliance
- Mill test certificate documenting Q235B/Q345B chemical composition and mechanical properties per GB standard with full heat number traceability
- CE certificate confirming EN 10210/EN 10219 compliance for hot-finished or cold-formed structural hollow sections exported to EU markets
- ISO 9001 quality management system certification covering entire production process from steelmaking through galvanizing
- SGS or BV third-party inspection report verifying zinc coating thickness, dimensional tolerance, and surface quality
- Material traceability documentation linking each tube bundle to specific heat number and production batch
- Complete customs documents including packing list, bill of lading, and certificate of origin for import clearance
Packaging, Loading & Delivery
- Galvanized square and rectangular tubes bundled with steel strips and edge protectors to preserve zinc coating during handling and ocean transit
- Wooden separators placed between tube layers in containers to prevent surface scratching and maintain ventilation for moisture-sensitive galvanized finish
- Custom length cutting to 1–12m specifications reduces on-site waste and optimizes container loading for 20ft or 40ft shipments
- Heat number and steel grade markings stenciled on each bundle for site identification and quality verification
- FOB, CIF, or DDP shipping terms available with professional loading plans for oversized rectangular sections up to 1000mm
- Door-to-door logistics coordination including customs clearance support for solar project sites in Middle East, Southeast Asia, and Africa
Request Quotation With Full Technical Documentation
Submit your project specifications including steel grade, section dimensions, wall thickness, total quantity, and destination port to receive detailed quotation with mill test certificate samples and production timeline. Our engineering team provides shop drawing review and material optimization recommendations for solar mounting and structural frame applications.
Get Your Hot-Dipped Galvanized SHS/RHS Quote Today
Send your specifications to receive pricing, mill test certificates, and delivery schedule within 24 hours.
Contact: 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
Frequently Asked Questions
Q: What is the difference between hot-dip galvanized and pre-galvanized square tubes for solar applications?
A: Hot-dip galvanizing immerses finished tubes in molten zinc, coating all surfaces including weld zones and internal corners with 30–275g/m² zinc thickness, providing 20-25 year corrosion protection for outdoor solar installations. Pre-galvanized tubes are formed from already-coated sheet, leaving cut edges and weld points unprotected against corrosion.
Q: Can you provide ASTM A500 Grade B or C square tubes for North American projects?
A: Yes, we produce Hot Dipped Galvanized Square and Rectangular Steel Tube to ASTM A500 Grade B/C/D specifications alongside Chinese GB grades Q235B and Q345B. Mill test certificates confirm chemical composition and mechanical properties meet your required standard for engineering approval.
Q: What zinc coating thickness do you recommend for coastal solar mounting structures?
A: For coastal or high-humidity environments, we recommend hot-dip galvanizing with minimum 80–100g/m² zinc coating thickness to ensure 25-year service life. Our production controls zinc bath temperature and immersion time to achieve consistent coating adhesion on all tube surfaces.
Q: How do you ensure dimensional accuracy for precision solar racking assembly?
A: Our ERW production process maintains tight tolerance on side length and wall thickness per BS EN and ASTM standards. Each production batch undergoes dimensional inspection with reports included in quality documentation packages, ensuring bolt-hole alignment and structural fit-up on site.
Q: What is your minimum order quantity and typical production lead time?
A: Minimum order quantity is 1 ton for Hot Dipped Galvanized Square and Rectangular Steel Tube. Production lead time depends on specification complexity and current order queue, typically ranging from standard inventory items to custom-size production runs.
