DX53D/ SGCD2/SGCD3 Galvanized Coil Product Overview
The DX53D/SGCD2/SGCD3 Galvanized Coil is a cold-rolled steel substrate coated with a 99.9% pure zinc layer via continuous hot-dip galvanizing. Compliant with EN 10346 (DX53D) and JIS G3302 (SGCD2/SGCD3) standards, it delivers 140–260 MPa yield strength and ≥30% elongation, making it ideal for automotive panels, HVAC ductwork, and deep-drawn components. With zinc coatings ranging from 60–275 g/m² (8–80 µm), it provides 15–35 years of corrosion resistance in moderate environments, outperforming electrogalvanized steel by 3x in durability.
Key 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 precision stamping dies)
- Zinc Coating Weight:
- Z60: 60 g/m² (8 µm) for indoor applications
- 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)
2. Chemical Composition
| Grade (EN 10346) | C (%) | Si (%) | Mn (%) | P (%) | S (%) |
|---|---|---|---|---|---|
| DX53D+Z | ≤0.12 | ≤0.50 | ≤0.60 | ≤0.10 | ≤0.045 |
| SGCD2 (JIS) | ≤0.10 | ≤0.50 | ≤0.45 | ≤0.03 | ≤0.03 |
| SGCD3 (JIS) | ≤0.08 | ≤0.50 | ≤0.45 | ≤0.03 | ≤0.03 |
Key Features:
- Ultra-Low Carbon: Enhances weldability and formability.
- Controlled Manganese: Balances strength and deep-drawing performance.
Mechanical Performance
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| DX53D+Z | 140–260 | 270–380 | ≥30 |
| SGCD2+Z | ≥220 | ≥300 | ≥22 |
| SGCD3+Z | ≥280 | ≥360 | ≥18 |
Functional Metrics:
- Deep Drawing: 12–15% limit drawing ratio (LDR).
- Bendability: 0T–2T (180° bend @ 0.5 mm thickness).
- Impact Resistance: 35 J/cm² at -20°C (ISO 148-1).
Corrosion Resistance by Environment
| Environment | Recommended Coating | Salt Spray Resistance |
|---|---|---|
| Indoor (Dry) | Z10 (100 g/m²) | 800–1,000 hours |
| Suburban | Z20 + Paint (200 g/m²) | 1,500–2,000 hours |
| Industrial/Urban | Z27 (270 g/m²) | 2,500+ hours |
| Coastal | Z27 + Paint | 3,000+ hours |
Surface Treatment Options
| Code | Treatment | Features | Applications |
|---|---|---|---|
| C | Chromic Acid Passivation | Hexavalent chromium-free, RoHS-compliant | Automotive chassis |
| P | Phosphating + Sealing | Enhances paint adhesion (5–7 µm primer) | Pre-painted roofing panels |
| O | Oiling (Anti-Fingerprint) | Prevents white rust during storage | Export packaging |
| M | Untreated | Immediate post-painting readiness | Custom fabrication projects |
Applications
- Automotive: Door panels, fuel tanks, and structural reinforcements.
- Construction: Roofing, gutters, and solar panel mounts.
- Appliances: Washing machine drums, refrigerator liners.
- Agriculture: Grain silos, livestock fencing.
Global Standard Equivalents
| China (GB) | Europe (EN) | USA (ASTM) | Japan (JIS) |
|---|---|---|---|
| DC53D+Z | DX53D+Z | A653 CS Type B | SGCD2/SGCD3 |
| S350GD+Z | S350GD+Z | A653 SS345 | SGC340 |
| S550GD+Z | S550GD+Z | A653 SS550 | SGC490 |
Sustainability & Certifications
- Recycled Content: 25–35% (ISO 14021 compliant).
- Carbon Footprint: ≤1.4 tons CO₂ per ton of steel.
- Certifications: RoHS, REACH, LEED v4.1, ISO 9001.
Packing And Delivery
