Hot-Dip Galvanized Steel Sheets: Ultimate Corrosion Protection for Industrial & Commercial Use
What is Hot-Dip Galvanized Steel?
Hot-dip galvanized (HDG) steel sheets are carbon steel plates coated with molten zinc (99.9% purity) through immersion at 450°C. This process creates a metallurgical bond between zinc and steel, forming a durable alloy layer that resists rust for 25-50 years. Widely used in construction, automotive, and energy sectors, HDG sheets provide 3x longer lifespan than standard steel at 60% lower cost than stainless alternatives.
Key Benefits
1️⃣ Superior Corrosion Resistance
- Zinc coating thickness: 60-275g/m² (Z60-Z275 grades)
- Salt spray resistance: 480-5,000 hours (ISO 9227)
2️⃣ Cost-Effective Protection
- Initial cost: 850−1,200/ton vs $2,500+/ton for stainless
- Maintenance-free for 15+ years
3️⃣ Eco-Friendly Solution
- 100% recyclable materials
- Zinc production energy: 25kWh/ton (vs 50kWh for aluminum)
Technical Specifications
1. Material Grades & Standards
| Grade (EN 10346) | Yield Strength | Tensile Strength | Coating Class |
|---|---|---|---|
| DX51D+Z | 140-260 MPa | 270-500 MPa | Z100-Z275 |
| S350GD+Z | 350 MPa | 420 MPa | Z180-Z275 |
| S550GD+Z | 550 MPa | 550 MPa | Z275 |
Coating Weight Guide: 1g/m² = 1.4μm thickness
2. Dimensional Range
- Thickness: 0.3mm-6mm (±0.02mm tolerance)
- Width: 600mm-1,500mm (customizable up to 3m)
- Length: 1m-12m (continuous coil available)
Production Process
- Surface Preparation
- Alkaline degreasing (5% NaOH at 70°C)
- Hydrochloric acid pickling (15% HCl, 2-4 minutes)
- Galvanizing Stage
- Zinc bath composition: 0.2% Aluminum for smooth coating
- Immersion time: 3-8 seconds (controlled spangle formation)
- Post-Treatment
- Chromate passivation (enhances paint adhesion)
- Oiling (anti-fingerprint protection)
Performance Comparison
| Feature | HDG Sheet | Pre-Galvanized | Electro-Galvanized |
|---|---|---|---|
| Coating Durability | 25-50 years | 10-15 years | 5-8 years |
| Edge Protection | Full coverage | Partial | None |
| Cost per m² (1mm) | $12.5 | $9.8 | $7.2 |
Application Guide
| Environment | Recommended Coating | Additional Protection |
|---|---|---|
| Coastal areas | Z275 + PVDF coating | Silicone sealants |
| Industrial zones | Z180 + epoxy paint | Regular rinsing |
| Agricultural sheds | Z120 | Annual inspection |
Quality Assurance
- Testing Standards:
- Coating adherence: ASTM A123 (3T bend test)
- Thickness verification: XRF analyzer (±1μm accuracy)
- Certifications:
- ISO 1461:2022
- ASTM A653/A653M
Why Choose Our HDG Sheets?
- Custom Processing: Laser cutting, press braking, and CNC punching services
- Fast Delivery: 15-day lead time for standard sizes
- Technical Support: Free corrosion resistance consultation
Environmental Fact: Our zinc sources contain 85% recycled content, reducing CO₂ emissions by 40% compared to virgin zinc production.
Installation Tips
- Storage: Keep sheets dry with VCI packaging
- Handling: Use nylon slings to prevent coating damage
- Welding: MIG weld at 18-22V with Zn-based filler wire
Conclusion
With zinc coatings up to 275g/m² and customizable sizes from 0.3mm to 6mm thickness, our hot-dip galvanized sheets deliver unmatched durability for roofing, automotive bodies, and structural frameworks. Request a free sample to test coating adhesion and mechanical properties specific to your project needs.
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