Description
Factory-Direct Galvanized SHS/RHS — Mill-certified Q195 to Q345 with full EN 10219 traceability.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS/RHS) |
| Steel Grade | Q195, Q235, Q235B, Q345, Q345B, St37, St42, St37-2, St35.4, St52.4, St35, 10#, 20#, 45#, 16Mn, A53(A,B) |
| Standard | API 5L, ASTM A53, ASTM A671, ASTM A252, ASTM A450, ASME B36.10M, ASTM A523, BS 1387, BS EN10296, BS 6323, BS 6363, BS EN10219, GB/T 3091, GB/T 13793, GB/T 9711 |
| Section Shape | Round / Square / Rectangle |
| Outer Diameter | 17–914 mm (0.67–35.98 in) |
| Wall Thickness | 1–12 mm |
| Length | 5–14 m (customizable: 5.8 m / 6 m / 10–12 m / 12 m) |
| Technique | Hot Rolled / Cold Rolled / ERW |
| Surface Treatment | Galvanized / PVC Coated / Black & Color Painting / Transparent Oil / Anti-rust Oil |
| Pipe Ends | Plain End / Beveled / Grooved / Threaded / Coupling (protected by plastic caps) |
| Tolerance | ±1% |
| Application | Fence / Greenhouse / Door Frame / Low-pressure Liquid Line Pipe / Indoor & Outdoor Building Construction / Scaffolding / Construction Structure |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial Construction | Building frames, column supports, door frames, and interior structural grids for warehouses and retail facilities |
| Industrial Infrastructure | Scaffolding systems, equipment platforms, conveyor supports, and factory mezzanine structures |
| Agricultural Facilities | Greenhouse skeleton frames, livestock fencing posts, and irrigation support structures |
| Fluid Transport | Low-pressure water, gas, and oil distribution lines with galvanized corrosion protection |
| Civil Engineering | Bridge handrails, highway sound barriers, and municipal utility supports |
When Galvanized Coating Thickness Becomes the Real Specification
A 40-micron zinc layer difference between mill output and site acceptance can strand an entire container at customs.
Outsourced galvanized SHS/RHS procurement often fractures accountability: the coating is applied at a third-party galvanizer, the base tube comes from another mill, and dimensional tolerance is verified by neither. When a project inspector pulls a coating thickness gauge on arrival, mismatched documentation and inconsistent zinc coverage turn a routine delivery into a two-month port storage bill. [NEED_CITE: hot-dip galvanized coating thickness standards for structural hollow sections]
A Galvanized Square and Rectangular Steel Tube Supplier operating under a single quality system — from raw coil to finished galvanizing — closes that gap. Every heat number traces back to the mill certificate; every coated batch carries the same WPS-qualified welding record and dimensional inspection report.
Matching Section Geometry to Structural Load Paths
Square and rectangular profiles concentrate material at the corners, delivering higher moment of inertia per kilogram than circular sections of equivalent weight. For building frames and scaffolding, this means fewer members carrying the same load — provided the Galvanized Square and Rectangular Steel Tube meets the flatness and corner-radii tolerances specified in EN 10219 or ASTM A500. Hot-dip galvanizing adds corrosion resistance without altering the structural section properties, making it the default choice for outdoor construction, greenhouse frames, and low-pressure fluid lines where moisture exposure is continuous.
Engineering Compliance Across International Standards
Structural hollow sections for load-bearing applications must satisfy both material chemistry and dimensional tolerance requirements. Q235B and Q345B correspond broadly to S235/S355 under EN 10025, while St37-2 and St52.4 align with DIN/EN legacy grades still specified on Middle East and African infrastructure projects. [NEED_CITE: steel grade equivalence tables between GB, EN, and ASTM systems] Galvanized Square and Rectangular Steel Tube orders destined for the EU require CE marking under EN 10219; North American shipments typically reference ASTM A500 or A53. End finishes — plain, beveled, grooved, or threaded — must match the field connection method specified in the erection drawings, and custom cut-to-length eliminates on-site welding for non-structural attachments.
Decoding the Steel Grade Designations on Your Drawings
Q195 and Q235 represent Chinese carbon structural grades where the number indicates minimum yield strength in MPa; Q345 (formerly 16Mn) adds manganese for improved weldability and higher load capacity. The St-series (St37, St42, St52) follows German DIN standards, with St52.4 offering the highest strength among the listed grades for heavy-duty structural frames. ASTM A53 Grade A and B cover general pipe applications, while API 5L extends to pressure-rated transport. Hot-rolled ERW production delivers consistent wall thickness across the 1–12 mm range, and the ±1% tolerance ensures that theoretical weight calculations match actual delivered mass — critical for shipping cost accuracy and structural analysis.
The Hidden Cost of Unverified Material Certificates
Accepting a Galvanized Square and Rectangular Steel Tube without a heat-number-traceable mill test certificate risks three failure modes: chemical composition outside the specified grade range, yield strength below the structural design assumption, and zinc coating thickness insufficient for the declared corrosion category. Any of these triggers rejection at the engineering inspection stage — forcing either return shipment or costly on-site reinforcement. [NEED_CITE: consequences of non-compliant structural steel in international construction projects]
Why Procurement Teams Consolidate with a Single Source
XJY Structure operates its own steel production facility with three rolling lines and maintains over 2,800 specifications in stock — eliminating the material-sourcing gap between tube mills and galvanizers. Every Galvanized Square and Rectangular Steel Tube order ships with complete quality documentation: WPS, PQR, weld maps, dimensional inspection reports, and coating thickness records. Certified welding procedures and qualified welders (AWS/EN) ensure that any fabrication modification — drilling, cutting, or welding — maintains structural integrity. Professional export packaging, oversized cargo loading, and full customs documentation (packing list, bill of lading, certificate of origin) support delivery to EU, Middle East, Southeast Asian, and African project sites.
Documentation & Compliance
- Mill Test Certificate documenting Q235B/Q345B chemical composition and mechanical properties per GB/T 3091 or EN 10219, traceable by heat number
- CE Certificate confirming EN 10219 cold-formed structural hollow section compliance for EU market entry
- ISO 9001 Quality Management System certificate covering the full production chain from raw material to galvanized finish
- SGS or BV Third-Party Inspection Report verifying coating thickness, dimensional tolerance, and surface quality prior to shipment
- Material Traceability Report linking each bundle to its original heat number, chemical analysis, and galvanizing batch
- Customs Documentation Package including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Galvanized Square and Rectangular Steel Tube bundled with steel strips and edge protectors to preserve the zinc coating during ocean transit
- Surface protection via transparent oil or anti-rust oil applied before galvanizing, with plastic end caps preventing moisture ingress at cut faces
- Container loading optimized for 5.8 m / 6 m / 12 m standard lengths, maximizing 20ft and 40ft GP utilization for Q195–Q345 sections
- Custom cut-to-length service available for 10–14 m requirements, with beveled or grooved ends prepared per erection drawings
- Heat number and steel grade stenciled on each bundle for site identification and inspection traceability
- FOB / CIF / DDP shipping terms supported with professional lashing and export documentation for global project delivery
Initiating Your Project Inquiry
Submit your project drawings (PDF/DWG), steel grade requirements (Q195–Q345 or St37–St52), surface treatment preference, and destination port to receive a detailed quotation within 24 hours — including material cost, galvanizing specification, production schedule, and shipping terms. Our engineering team will review shop drawings, confirm dimensional compliance, and provide the complete mill test certificate package before production begins.
Frequently Asked Questions
Q: How do Q235B and Q345B compare to S235 and S355 in European specifications?
A: Q235B and Q345B are Chinese carbon structural grades with minimum yield strengths of 235 MPa and 345 MPa respectively. They correspond broadly to S235 and S355 under EN 10025, though chemical composition limits and impact testing requirements may differ. For EU projects requiring EN 10219 compliance, we provide grade equivalence documentation and can supply material meeting both GB and EN standards.
Q: What documentation do you provide, and can I arrange independent inspection?
A: Every Galvanized Square and Rectangular Steel Tube order ships with a Mill Test Certificate (chemical composition and mechanical properties), dimensional inspection report, and coating thickness record. Third-party inspection by SGS, BV, or your nominated surveyor is available for pre-shipment verification at our facility.
Q: Can you produce non-standard dimensions, and what is the minimum order quantity?
A: We stock over 2,800 specifications covering outer diameters from 17–914 mm and wall thicknesses from 1–12 mm. Custom lengths (5.8 m / 6 m / 10–14 m) and special end finishes (beveled, grooved, threaded) are available. The minimum order quantity is 1 Ton, suitable for trial orders or specialized project requirements.
Q: When should I specify hot-dip galvanized versus painted or PVC-coated finish?
A: Hot-dip galvanizing provides superior corrosion resistance for outdoor construction, scaffolding, greenhouse frames, and low-pressure fluid lines exposed to moisture. PVC coating adds an extra barrier for aggressive chemical environments or aesthetic requirements. Painted finishes suit indoor applications or projects where color matching is specified. Transparent oil or anti-rust oil protects during transit and short-term storage.
Q: What is the typical production lead time, and do you handle international shipping?
A: Production lead times vary by order quantity and specification complexity, typically ranging from 7–45 days. We support FOB, CIF, and DDP shipping terms with professional export packaging, container loading optimization, and complete customs documentation for delivery to EU, Middle East, Southeast Asian, and African project sites.
Get Your Galvanized SHS/RHS Quotation with Full Mill Certification
Share your project specifications — steel grade, dimensions, surface treatment, and destination — to receive a detailed quotation and Mill Test Certificate preview within 24 hours.
Contact XJY Structure
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
