G60 Galvanized Steel Sheet: Premium Corrosion Resistance for Industrial & Architectural Use
G60 Galvanized Sheet Product Overview
G60 galvanized steel sheet is a hot-dip galvanized (HDG) carbon steel product with a total zinc coating weight of 60 g/m² (30 g/m² per side), compliant with ASTM A653, EN 10346, and JIS G3302 standards. Designed for moderate to high corrosion environments, this material combines cost efficiency with 400–600 hours of salt spray resistance (ISO 9227). Ideal for agricultural equipment, automotive panels, and roofing systems, G60 offers balanced durability and formability.
Technical Specifications
1. Base Material & Dimensions
- Thickness: 0.12mm (ultra-thin electrical components) to 6.00mm (structural beams) with ±0.03mm tolerance
- Width: 600mm–1,500mm (compatible with automated roll-forming lines)
- Coating Structure: Triple-layer zinc-iron alloy (Gamma, Delta, Zeta phases)
2. Coating Performance
- Total Zinc Weight: 60 g/m² (8.4µm per side)
- Equivalent Standards:
- G60 (ASTM A653): 0.60 oz/ft² total
- Z30 (EN 10346): 30 g/m² per surface
3. Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (A80%) |
|---|---|---|---|
| DX51D+G60 | 240–380 | 270–500 | ≥22% |
| S220GD+G60 | ≥220 | ≥300 | ≥20% |
| SGCC+G60 | 140–300 | 270–420 | ≥26% |
Manufacturing Process
- Hot-Dip Galvanizing:
- Steel coils are degreased in alkaline solutions (pH 12, 70°C)
- Annealed at 720°C in hydrogen-nitrogen atmosphere
- Dipped in 455°C zinc bath (0.18% aluminum content)
- Air-knife calibrated for ±5% coating uniformity
- Post-Treatment Options:
- Code C (Chromate): 0.5µm layer for indoor storage
- Code S (Sealed Chromate + Oiling): Enhanced scratch resistance
- Code Q (Phosphate + Oiling): Paint-ready surface (Ra 1.2µm)
Environmental Adaptability
| Exposure Scenario | Recommended Solution | Service Life* |
|---|---|---|
| Dry indoor storage | G60 + Code C | 10–12 years |
| Urban industrial zones | G60 + Code Q + 50µm polyester | 15–18 years |
| Coastal infrastructure | G60 + PVDF coating | 25+ years |
Based on ISO 12944-2 corrosion categories C2–C3
Forming & Fabrication
- Bending Performance:
- Minimum bend radius: 1× thickness (0.5mm sheet: R0.5mm)
- No spangle cracking in 180° T-bend tests
- Welding Compatibility:
- MIG welding parameters: 18–22V, 4–6m/min wire speed
- Laser cutting speed: 6m/min for 1.5mm thickness
- Surface Finishes:
- Regular Spangle: Gloss 50–60 GU (20° measurement)
- Zero Spangle: Ra 0.8µm for Class A painted surfaces
Chemical Composition
| Element | C | Mn | P | S | Al |
|---|---|---|---|---|---|
| Content | ≤0.15% | ≤1.70% | ≤0.025% | ≤0.025% | 0.02–0.15% |
Low carbon content (≤0.15%) ensures superior weldability, while aluminum controls zinc crystal formation.
Competitive Advantages
- Cost: 20% cheaper than stainless steel 304 in mild environments
- Durability: 3× longer lifespan vs. electro-galvanized sheets
- Sustainability: 85% recycled steel content, 98% zinc recovery rate
Industry Applications
- Agriculture:
- Grain silo roofs (0.7mm G60 withstands 1,500Pa snow loads)
- Livestock fencing (2.5mm sheets with 50µm epoxy coating)
- Automotive:
- Truck underbody panels (1.2mm G60 + Code S treatment)
- Battery tray stamping (0.8mm precision)
- Construction:
- Perforated acoustic ceilings (0.5mm, ±0.1mm hole accuracy)
- Standing seam roofing systems (0.6mm, 150km/h wind rating)
Quality Assurance
- Third-party certified mill test reports (MTRs)
- Coating adhesion: ≤5% peeling in 10mm grid scribe tests
- Surface roughness: Ra 0.8–1.2µm for optimal paint adhesion
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