G60 Galvanized Coil Product Overview
The G60 Galvanized Coil (ASTM A653 designation) features a total zinc coating weight of 60 oz/ft² (≈183 g/m²), providing 15–25 years of corrosion resistance in moderate to harsh environments. Produced via continuous hot-dip galvanizing at 450–465°C with a line speed of 180 m/min, this cold-rolled carbon steel substrate achieves 240–550 MPa yield strength and ≥15% elongation, making it ideal for automotive body panels, agricultural equipment, and electrical enclosures. Compliant with ASTM A653 (G60) and EN 10346 (Z180), it bridges cost efficiency and heavy-duty protection, offering 35% longer lifespan than G40-grade coatings.
Key Technical Specifications
1. Dimensional & Coating Properties
- Base Steel Thickness: 0.12–3.5 mm (±3% tolerance per ASTM A924)
- Width: 600–1,500 mm (precision-slitted for roll-forming compatibility)
- Zinc Coating:
- Total Weight: 60 oz/ft² (183 g/m²) – 25–35 µm per side
- Adhesion Strength: ≥3.2 N/mm² (ISO 2409 cross-hatch test)
- Surface Finish:
- Zero Spangle (Z): Smooth, spangle-free (Ra ≤0.9 µm) for powder coating
- Minimized Spangle (M): Fine crystalline texture (Ra 1.5–3.0 µm)
2. Mechanical & Chemical Performance
| Grade | Yield (MPa) | Tensile (MPa) | Elongation (%) | Bendability |
|---|---|---|---|---|
| G60 (ASTM) | 240–550 | 300–600 | ≥15 | 0T–3T (1.2 mm) |
| S350GD+Z (EN) | ≥350 | ≥420 | ≥16 | 1T–4T (1.5 mm) |
| SGCD3 (JIS) | ≥220 | ≥300 | ≥22 | 0T–2T (1.0 mm) |
Chemical Composition:
| Element | G60 (ASTM) | S350GD (EN) | SGCD3 (JIS) |
|---|---|---|---|
| Carbon (C) | ≤0.18% | ≤0.20% | ≤0.08% |
| Manganese (Mn) | ≤0.70% | ≤0.70% | ≤0.45% |
| Phosphorus (P) | ≤0.12% | ≤0.10% | ≤0.03% |
Functional Advantages:
- Ultra-Low Carbon Content: Reduces weld brittleness risk (recommended welding current: 9–13 kA).
- Zinc-Iron Alloy Layer: 2–5 µm Fe-Zn intermetallic bond prevents coating peel-off during stamping.
Corrosion Resistance by Application
| Environment | Recommended Coating | Service Life | Key Industries |
|---|---|---|---|
| Indoor Storage | Z60 (183 g/m²) | 15–18 years | Warehousing, Retail |
| Suburban Residential | G60 + Paint (2 layers) | 20–25 years | Roofing, HVAC Ducts |
| Industrial Zones | Z180 + Chromate Passivation | 18–22 years | Machinery, Chemical Tanks |
| Coastal (500m) | Z275 Overcoat | 12–15 years | Offshore Platforms |
Surface Treatment Options
| Code | Treatment | Benefits | Applications |
|---|---|---|---|
| C | Chromate-Free Passivation | RoHS-compliant, enhances salt spray resistance by 30% | Solar panel frames |
| P | Zinc Phosphate + Sealing | Paint adhesion >8 MPa (ISO 2409) | Pre-painted wall cladding |
| Q | Oiling + Phosphating | Prevents white rust during海运 transit | Export-ready structural parts |
| M | Mill Finish | Ready for post-fabrication painting | Custom industrial components |
Global Standard Equivalents
| USA (ASTM) | Europe (EN) | Japan (JIS) | China (GB) |
|---|---|---|---|
| G60 | Z180 | SGCC Z18 | DC51D+Z180 |
| SS350 | S350GD+Z | SGC350 | B350VK+Z |
Sustainability & Certifications
- Recycled Content: 28–38% (ISO 14021-certified)
- Carbon Footprint: 1.3 tons CO₂/ton (EPD verified)
- Certifications: RoHS, REACH, LEED v4.1, ISO 9001
Packing And Delivery
