Description
Certified Mill Supply with Full Documentation — Every ASTM A500 and S355JR galvanized square hollow section ships with original mill test certificates and third-party inspection reports for customs clearance across 50+ countries.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square Hollow Section |
| Product Type | Square / Rectangular Steel Tube (Hollow Section) |
| Steel Grade | A53 Grade B, A500 Grade A/B/C, STK400, SS400, ST42.2, S355JR |
| Standard | ASTM A53, A500, A36, BS1387, EN10255, ISO65, ANSI C80, DIN2440, JIS G3444, GB/T3091, GB/T13793 |
| Section Shape | Square, Rectangular |
| Size Range | 21.3 mm – 660 mm (1/2″ – 26″) |
| Wall Thickness | 6 mm (full range per inquiry) |
| Length | 5.8 m / 6 m / 11 m / 12 m or customized |
| Technique | Hot-dip Galvanized / Pre-galvanized (ERW base pipe) |
| Surface Treatment | Hot-dip Galvanizing |
| Tolerance | ±1% |
| Ends | Plain, Beveled, Threaded, Grooved |
| Application | Steel structures, construction frames, gate & post systems, fencing, machinery parts, fluid transport, scaffolding |
| MOQ | 1 Ton |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, scaffolding systems, industrial park fencing |
| Gate & Post Systems | 30 m–80 m perimeter fencing, agricultural facility enclosures, security barriers |
| Steel Fabrication | Machinery bases, conveyor structures, equipment supports |
| Utility & Fluid Transport | Low-pressure water lines, gas distribution, air supply piping |
Where Zinc Coating Thickness Decides Project Lifespan
Hot-dip galvanizing at 80+ microns prevents corrosion failure in tropical climates.
Gate and post installations across Southeast Asia face constant humidity and salt exposure. Pre-galvanized tubes with thin zinc layers corrode within months, requiring costly replacement. Hot-dip galvanized square hollow section with proper coating thickness maintains structural integrity for decades. [NEED_CITE: hot-dip galvanizing coating thickness standards for outdoor structural applications]
Matching Structural Requirements for Perimeter Security Systems
Gate and post systems demand consistent wall thickness and straight bow tolerance. Our galvanized square hollow section meets ASTM A500 Grade B and S355JR specifications, ensuring load-bearing capacity for 30 m–80m fencing projects. Custom cutting and punching services eliminate on-site fabrication delays.
Engineering Compliance and Certification Framework
Structural hollow sections must comply with EN 1993 or AISC design codes for load calculations. Hot-dip galvanizing provides corrosion protection in C3-C4 environments per ISO 12944. CE certification under EN10219 ensures compliance for European projects, while ASTM A500 meets North American structural requirements. [NEED_CITE: EN 10219 cold-formed structural hollow section requirements]
Steel Grade Selection and Galvanizing Process Fundamentals
ASTM A500 Grade B and S355JR offer higher yield strength than basic carbon grades, reducing section weight while maintaining structural performance. ERW (Electric Resistance Welded) base pipes provide cost-effective solutions for non-pressure applications. Hot-dip galvanizing immerses steel in molten zinc at 450°C, creating metallurgical bonding with 80-120 micron coating thickness. Pre-galvanized tubes use electroplating with thinner 20-40 micron layers suitable for indoor applications only.
Wall thickness tolerance directly affects theoretical weight and load capacity. Negative tolerance beyond ±5% compromises structural calculations and may fail engineering inspections.
Hidden Costs of Non-Compliant Hollow Section Procurement
Undersized wall thickness or insufficient zinc coating leads to project rejection during structural inspection. Missing mill test certificates cause customs delays and shipment holds. Material substitution without proper grade equivalence documentation creates liability issues. [NEED_CITE: steel grade equivalence between ASTM and EN standards]
Why Source Galvanized Square Hollow Section from XJY Plate
Factory-direct pricing eliminates trading company markups on volume orders. In-house metallurgical laboratory generates mill test certificates with heat number traceability for every batch. Over 2800 specifications in stock enable mixed-size container loading to optimize freight costs. CE and ISO 9001:2015 certification ensures compliance documentation for international projects. SGS and BV third-party inspection available before shipment. Custom cutting, punching, and bending services reduce on-site fabrication time. Professional heavy cargo loading experience prevents coating damage during transit.
Documentation & Compliance
- Mill test certificate documenting ASTM A500 Grade B chemical composition and mechanical properties per heat number
- CE certificate confirming EN10219 compliance for S355JR structural hollow sections
- ISO 9001:2015 quality management system certification
- SGS or BV third-party inspection report verifying dimensions and zinc coating thickness
- Material traceability from steel coil to finished galvanized tube with heat number tracking
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Galvanized square hollow section bundled with steel strips and edge protectors to preserve zinc coating during ocean transit
- Hot-dip galvanized surface protected with plastic end caps to prevent moisture accumulation
- Mixed-size loading optimization for 20ft and 40ft containers based on 5.8m/6m/11m/12m lengths
- Custom cutting to project-specific lengths reduces on-site waste and handling
- Heat number and steel grade marked on each tube for site identification and traceability
- FOB, CIF, and DDP shipping terms with door-to-door logistics for project sites
Streamlining Your Procurement Process
Submit specifications including steel grade, section size, wall thickness, quantity, and destination port to receive detailed quotation with mill test certificate preview. Request custom cutting drawings for gate and post systems to optimize container loading. Confirm certification requirements for your market to ensure compliance documentation.
Frequently Asked Questions
Q: What is the difference between hot-dip galvanized and pre-galvanized square hollow section?
A: Hot-dip galvanizing provides 80-120 micron zinc coating through molten zinc immersion, suitable for outdoor and corrosive environments. Pre-galvanized tubes have 20-40 micron electroplated coating for indoor applications only.
Q: Can you supply mixed sizes in one container to reduce freight costs?
A: Yes, we optimize container loading with mixed section sizes and lengths (5.8m/6m/11m/12m) from our 2800+ specification inventory to maximize volume utilization.
Q: What zinc coating thickness can be guaranteed for hot-dip galvanized SHS?
A: Hot-dip galvanized square hollow section maintains minimum 80 micron coating thickness per ASTM A123 or EN ISO 1461 standards, verified by coating thickness gauge inspection.
Q: How do you handle steel grade equivalence for international projects?
A: We provide grade equivalence documentation between ASTM A500, EN10219 S355JR, and GB standards, with mill test certificates showing chemical composition and mechanical properties for verification.
Q: What third-party inspection services are available before shipment?
A: SGS and BV inspection services verify dimensions, wall thickness, zinc coating, and mechanical properties. Inspection reports include photographs and measurement data for quality confirmation.
Get Your Galvanized Square Hollow Section Quote with Mill Test Certificate
Submit your specifications including steel grade, section dimensions, quantity, and destination to receive quotation with material certification preview within 12 hours.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjyplate.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
