DX51D/ SGCC Galvanized Coil Product Overview
DX51D/SGCC Galvanized Coil is a cold-rolled carbon steel substrate coated with a 99.9% pure zinc layer via continuous hot-dip galvanizing. Designed for stamping, bending, and deep drawing, it meets EN 10346 (DX51D) and JIS G3302 (SGCC) standards, offering 140–550 MPa tensile strength and ≥22% elongation. With zinc coating weights of 60–275 g/m² (8–80 μm), it provides 10–30 years of corrosion resistance in moderate environments. Applications span automotive panels, HVAC ductwork, and agricultural equipment, delivering 15–40% cost savings versus stainless steel.
Technical Specifications
1. Dimensional & Coating Properties
- Base Steel Thickness: 0.12–3.5 mm (±5% tolerance per ASTM A924)
- Width: 600–1,500 mm (custom slit for automotive stamping dies)
- Coating Weight:
- Z60: 60 g/m² (8 μm) for indoor appliances
- Z275: 275 g/m² (80 μm) for coastal infrastructure
- Surface Finish:
- Zero Spangle (Z): Smooth, spangle-free (Ra ≤0.8 μm) for painting
- Minimized Spangle (M): Fine crystalline texture (Ra 1.2–2.5 μm)
- Normal Spangle: Decorative for non-critical uses
2. Chemical Composition
| Grade (EN 10346) | C (%) | Si (%) | Mn (%) | P (%) | S (%) |
|---|---|---|---|---|---|
| DX51D+Z | ≤0.12 | ≤0.50 | ≤0.60 | ≤0.10 | ≤0.045 |
| S350GD+Z | ≤0.20 | ≤0.60 | ≤0.70 | ≤0.10 | ≤0.045 |
Key Features:
- Zinc Purity: ≥99.9% for uniform adhesion.
- Trace Elements: Controlled Al (0.15–0.22%) to minimize dross.
Mechanical Performance
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| DX51D+Z | 240–380 | 270–500 | ≥22 |
| S250GD+Z | ≥250 | ≥330 | ≥19 |
| S550GD+Z | ≥550 | ≥550 | – |
Functional Metrics:
- Bendability: 0T–2T (180° bend @ 0.5 mm thickness).
- Weldability: 8–12 kA spot welding current (20% lower than bare steel).
- Impact Resistance: 35 J/cm² at -20°C (ISO 148-1).
Surface Treatment Options
| Code | Treatment | Features | Applications |
|---|---|---|---|
| C | Chromic Acid Passivation | High corrosion resistance, unpainted use | Outdoor electrical cabinets |
| P | Phosphating + Sealing | Enhanced paint adhesion | Automotive body panels |
| O | Oiling | Anti-fingerprint, storage protection | Pre-painted coil substrates |
| M | Untreated | Immediate post-painting | Custom fabrication projects |
Environmental Compliance:
- RoHS-Certified: Hexavalent chromium-free (EN 10346-C5).
- VOC Emissions: <50 g/L (GreenGuard Gold compliant).
Applications by Industry
| Industry | Use Case | Recommended Coating |
|---|---|---|
| Automotive | Chassis, fuel tanks | DX54D+Z (Z180 coating) |
| Construction | Roofing, gutters | S350GD+Z (Z275 coating) |
| Agriculture | Grain silos, livestock pens | S220GD+Z (Z200 coating) |
| Electronics | Server racks, enclosures | DX51D+Z (Z100 coating) |
Global Standard Equivalents
| China (GB) | Europe (EN) | USA (ASTM) | Japan (JIS) |
|---|---|---|---|
| DC51D+Z | DX51D+Z | A653 CS Type B | SGCC |
| S350GD+Z | S350GD+Z | A653 SS345 | SGHC340 |
| S550GD+Z | S550GD+Z | A653 SS550 | SGHC550 |
Sustainability & Certifications
- Recycled Content: 25–35% (ISO 14021 compliant).
- Carbon Footprint: ≤1.4 tons CO₂ per ton of steel.
- Certifications: LEED v4.1, REACH, ISO 9001.
Packing And Delivery
