Description
Factory-direct pricing, zero middlemen — XJY Structure operates its own steel production lines alongside the fabrication workshop, so every Galvanized Square and Rectangular Steel Tube ships at mill price with full material traceability from slab to finished section.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q195, Q235, Q345, SS400 |
| Standard | ASTM A53, A500, A36, A795; BS1387; EN10255; ISO65; ANSI C80; DIN2440; JIS G3444; GB/T3091; GB/T13793 |
| Section Shape | Square, Rectangular |
| Size Range | 21.3mm–660mm (1/2″–26″) |
| Wall Thickness | 0.12–5mm |
| Length | 5.8m / 6m / 11m or custom |
| Technique | Hot Rolled Based / Pre-Galvanized |
| Surface Treatment | Zinc Coated (40–600g/m²), Zero Spangle |
| Tolerance | ±1% |
| Ends | Plain ends, Beveled ends, Threaded ends, Grooved ends |
| Application | Steel structures / Construction frames / Machinery / Scaffolding / Furniture / Fencing / Fluid transportation / Building industry |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Structural frames, column supports, bracing systems for commercial buildings and industrial warehouses |
| Machinery & Equipment | Machine frames, equipment guards, conveyor support structures requiring corrosion protection |
| Scaffolding & Access | Lightweight scaffolding uprights, ledger braces, walkway supports with aesthetic zero-spangle finish |
| Furniture & Fencing | Decorative furniture frames, security fencing posts, gate structures with uniform surface appearance |
Zinc Coating Weight Decides Whether Your Galvanized Square and Rectangular Steel Tube Survives the Salt Spray Test
A 40g/m² zinc layer protects indoor furniture; a 600g/m² layer keeps coastal scaffolding standing for years.
I once saw an entire container of galvanized tubes get rejected at a Middle Eastern medical equipment facility — the buyer specified 15μm minimum zinc thickness, but the mill shipped material at only 8μm. The salt spray test failed within hours, and the return freight cost more than the original order. That kind of gap between specification and delivery is what happens when procurement is fragmented across multiple suppliers who point fingers at each other. With a Galvanized Square and Rectangular Steel Tube Supplier that controls both the steel production and the galvanizing line, the coating weight is verified at source, and every batch carries a third-party inspection report before it leaves the factory. [NEED_CITE: hot-dip galvanizing coating thickness standards for structural steel]
Matching Section Geometry and Zinc Weight to Structural and Corrosion Demands
When engineers specify a Galvanized Square and Rectangular Steel Tube for a warehouse frame in Southeast Asia, they are balancing three variables: section modulus for load-bearing, zinc coating mass for atmospheric corrosion resistance, and dimensional tolerance for bolted or welded connections. Our vertically integrated facility produces SHS and RHS sections from Q195 through Q345 with zinc coatings ranging from 40g/m² for interior furniture applications to 600g/m² for marine-adjacent infrastructure. The zero spangle finish delivers a uniform matte appearance that accepts powder coating without additional surface preparation, while the ±1% dimensional tolerance ensures that pre-drilled connection plates align on site without forcing or reaming.
Engineering Compliance Across EN, ASTM, and GB Standards
Structural hollow sections used in European projects must conform to EN 10210 for hot-finished or EN 10219 for cold-formed profiles, and customs authorities increasingly request CE marking documentation at the port of entry. [NEED_CITE: EN 10219 cold-formed structural hollow section compliance requirements] For North American projects, ASTM A500 Grade B or C governs the same SHS/RHS geometry with different chemical and mechanical thresholds. Our Galvanized Square and Rectangular Steel Tube production cross-references Q235 to S235JR and Q345 to S355JR, providing equivalence documentation that satisfies both the structural engineer’s calculation sheet and the importing country’s certification body. Custom lengths of 5.8m, 6m, or 11m are available to optimize container loading and reduce on-site cutting waste, while beveled, threaded, or grooved ends arrive ready for welding, mechanical coupling, or flange connection without secondary machining.
Steel Grade Selection and the Pre-Galvanizing Process
The Q-series grades — Q195, Q235, Q345 — follow the Chinese GB system where the number indicates minimum yield strength in MPa, while SS400 follows the Japanese JIS standard with equivalent tensile requirements. [NEED_CITE: steel grade equivalence between GB Q-series and JIS SS-series] Selecting Q235 for general construction frames keeps material cost low while providing adequate weldability, whereas Q345 is specified for heavier load-bearing columns and crane runway beams where higher yield strength reduces section size. The pre-galvanizing technique applies the zinc coating to the flat strip before forming into square and rectangular sections, ensuring complete coverage including the corner radii — a critical advantage over post-galvanizing where internal corner coverage can be inconsistent. The skin-pass treatment after galvanizing produces a smooth, zero spangle surface that eliminates the crystalline pattern typical of hot-dip galvanizing, making these tubes suitable for exposed architectural applications where visual consistency matters.
The Hidden Cost of Wrong Zinc Weight and Unverified Mill Certificates
Ordering a Galvanized Square and Rectangular Steel Tube with a specified 275g/m² zinc coating but receiving material at 120g/m² does not become apparent until the first corrosion blister appears on site — or worse, until the inspector’s salt spray chamber returns a failed result. [NEED_CITE: consequences of substandard galvanizing coating thickness on structural steel service life] Beyond the material replacement cost, the project faces schedule delays, re-mobilization of installation crews, and potential structural safety concerns if the compromised tubes have already been welded into load-bearing frames. Material certificates that cannot be traced to a specific heat number create additional risk: customs authorities in the EU and Middle East routinely hold shipments without verifiable EN 10204 3.1 documentation, and the demurrage charges accumulate while the supplier and the trading company exchange emails about who is responsible.
Procurement Confidence from a Vertically Integrated Steel Producer
XJY Structure operates its own steel mill with three production lines and maintains over 2,800 specifications of raw material in stock, meaning every Galvanized Square and Rectangular Steel Tube is produced, galvanized, and inspected under a single quality management system. Our in-house laboratory issues Mill Test Certificates documenting chemical composition and mechanical properties for each heat number, and we coordinate third-party inspections through SGS, BV, or Intertek before shipment — eliminating the documentation gaps that occur when material sourcing and fabrication are split between unrelated companies. The fabrication workshop handles CNC cutting, drilling, welding, and surface treatment to international standards including AWS and EN 1090, so project-specific components arrive with complete shop drawing approval, weld maps, dimensional inspection reports, and coating thickness certificates in a single documentation package. Professional loading plans for oversized and heavy fabricated components ensure that every container maximizes payload while protecting the galvanized surface during ocean transit.
Documentation & Compliance
- Mill Test Certificate (EN 10204 3.1) documenting Q235/Q345 chemical composition and mechanical properties per GB/T3091 and GB/T13793
- CE Certificate confirming EN 10210 / EN 10219 compliance for structural hollow sections entering European Union markets
- ISO 9001 quality management system certificate covering the full production chain from steelmaking to galvanizing and finishing
- SGS / BV / Intertek third-party inspection report verifying zinc coating thickness (40–600g/m²) and dimensional tolerance (±1%) before shipment
- Material traceability documentation linking each bundle to its heat number, steel grade (Q195/Q235/Q345/SS400), and production date
- Complete customs export package including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Galvanized Square and Rectangular Steel Tube bundles secured with steel strips and edge protectors to preserve the zero spangle zinc coating during handling and ocean transit
- Non-oiled surface condition with plastic end caps on beveled or threaded ends to prevent zinc damage and thread deformation
- Container loading optimized for 5.8m and 6m lengths in 20ft containers, or 11m lengths in 40ft open-top containers, with wooden cradles preventing point-contact scratches on the galvanized surface
- Heat number and steel grade stenciled on each bundle for on-site identification and traceability verification against the Mill Test Certificate
- FOB, CIF, or DDP delivery terms available, with professional lashing plans for oversized rectangular sections up to 660mm side length
Start Your Inquiry with Drawings and Specifications
Submit your project drawings (PDF/DWG), steel grade requirements (Q195/Q235/Q345/SS400), zinc coating weight, and destination port to receive a detailed quotation within 24 hours — including material cost, fabrication charges, coating specifications, and a production schedule aligned with your project timeline. Our engineering team will review your shop drawings, confirm dimensional feasibility within the 21.3mm–660mm size range and 0.12–5mm wall thickness capability, and advise on the most efficient container loading configuration for your order quantity.
Frequently Asked Questions
Q: How do Q235 and Q345 compare to S235JR and S355JR in European standards?
A: Q235 and Q345 follow the Chinese GB/T3091 and GB/T13793 standards, with minimum yield strengths approximately equivalent to S235JR and S355JR in EN 10219. We provide cross-reference documentation for EU project compliance.
Q: When should I specify 40g/m² versus 275g/m² or 600g/m² zinc coating?
A: A 40g/m² coating suits indoor, dry environments such as furniture frames and interior scaffolding. A 275g/m² coating covers typical outdoor construction in moderate climates. A 600g/m² coating is required for coastal, industrial, or high-humidity environments where long-term corrosion resistance is critical.
Q: Can you produce non-standard sizes outside the 21.3mm–660mm range?
A: Our production covers 21.3mm to 660mm side length with wall thickness from 0.12mm to 5mm. For dimensions outside this range, we evaluate feasibility based on our mill capability and can provide a custom quotation.
Q: Do you provide CE marking and EN 10210 compliance for European projects?
A: Yes. Our Galvanized Square and Rectangular Steel Tube production meets EN 10210 and EN 10219 requirements, and we supply CE certification documentation along with Mill Test Certificates for customs clearance and structural verification.
Q: What is the minimum order quantity?
A: The MOQ is 1 Ton, which allows small project orders and sample quantities before full production commitment.
Get Your Galvanized Square and Rectangular Steel Tube Quotation Today
Send your specifications, drawings, and target quantity to receive pricing, Mill Test Certificate samples, and a production timeline — all from a single source controlling steel production through final fabrication.
Website: www.xjystructure.com | Email: admin@xjystructure.com | WhatsApp: +86 188 5315 7756
