DX52D/SGCD1 Galvanized Steel Sheets: Advanced Corrosion Resistance & Formability
DX52D/SGCD1 Galvanized Sheet Product Overview
DX52D (EN 10346) and SGCD1 (JIS G3313) galvanized steel sheets are high-performance cold-rolled materials optimized for precision forming in automotive, appliance, and construction applications. Featuring a zinc coating range of 60-275g/m², these sheets combine enhanced bendability (r-value up to 2.1) with 600+ hours salt spray resistance (ISO 9227). The DX52D grade specifically offers 30% better deep-drawing performance than standard DX51D, while SGCD1’s ultra-low carbon content (≤0.12%) ensures crack-free stamping for complex geometries.
Key Technical Specifications
1. Material Grades & Standards
| Grade | Standard | Equivalent Grades | Key Application |
|---|---|---|---|
| DX52D+Z | EN 10346 | S220GD (EU) | Automotive panels |
| SGCD1 | JIS G3313 | SGCC (Japan) | Appliance housings |
2. Dimensional Parameters
- Thickness: 0.12mm (ultra-thin) to 6.00mm (±0.03mm tolerance)
- Width: 600-1,500mm (custom slit edges available)
- Coating Weight:
- Z100 (100g/m²) = 14μm zinc layer
- Z275 (275g/m²) = 38.5μm zinc layer
3. Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (A80) |
|---|---|---|---|
| DX52D | 140-300 | 270-420 | ≥26% |
| SGCD1 | 180-260 | 300-420 | ≥30% |
Advanced Surface Treatments
To optimize performance across environments:
| Code | Treatment | Corrosion Resistance | Key Benefit |
|---|---|---|---|
| C | Chromate passivation | 500-800hrs (salt spray) | REACH-compliant, no hexavalent Cr |
| Q | Phosphating + oiling | 300-500hrs | Class 1 paint adhesion (ISO 2409) |
| O | Oiling only | 72-120hrs | Scratch protection during handling |
Chemical Composition Analysis
DX52D (EN 10143)
| Element | C | Mn | P | S | Al |
|---|---|---|---|---|---|
| Content | ≤0.12% | ≤0.60% | ≤0.10% | ≤0.045% | ≥0.020% |
SGCD1 (JIS G3313)
| Element | C | Si | Mn | P | S |
|---|---|---|---|---|---|
| Content | ≤0.12% | ≤0.50% | ≤0.60% | ≤0.040% | ≤0.030% |
The controlled carbon content minimizes strain aging, critical for components requiring repeated bending.
Environmental Adaptability Guide
| Application Environment | Recommended Coating | Service Life* |
|---|---|---|
| Indoor dry storage | Z60 + Chromate (C) | 15-20 years |
| Automotive underbody | Z180 + Q treatment | 10-12 years |
| Coastal architecture | Z275 + PVDF topcoat | 25+ years |
Based on ISO 12944-2 corrosion categories C3-C5
Forming & Fabrication Advantages
- Deep Drawing Performance
- Limiting drawing ratio (LDR): 2.3:1 (DX52D) vs 2.0:1 (DX51D)
| Grade | r-value | n-value |
|———|———|———|
| DX52D | 1.9 | 0.22 |
| SGCD1 | 2.1 | 0.20 |
- Limiting drawing ratio (LDR): 2.3:1 (DX52D) vs 2.0:1 (DX51D)
- Welding Compatibility
- Resistance welding: 8-12kA current range
- Laser welding speed: 4m/min (1mm thickness)
- Surface Finish Options
- Zero spangle (Ra 0.5μm) for high-gloss painting
- Regular spangle (Ra 1.2μm) for architectural aesthetics
Certifications & Compliance
- ISO 9001:2015 quality management system
- RoHS/REACH compliant (Pb/Cd/Phthalate-free)
- Meets EU Construction Products Regulation 305/2011
Industry Applications
- Automotive Manufacturing
- Door inners (DX52D Z180 withstands 1M+ stamping cycles)
- Chassis components (SGCD1 Z275 resents road salt corrosion)
- Appliance Engineering
- Refrigerator liners (Z100 coating + Q treatment)
- Washing machine drums (DX52D Z150 with 180° hemming)
- Building Systems
- Standing seam roofs (Z275 + SMP coating, 50-year warranty)
- Solar panel frames (SGCD1 Z200, 35% lighter than aluminum)
Competitive Analysis
| Parameter | DX52D Z150 | SGCD1 Z180 | ASTM A653 G90 |
|---|---|---|---|
| Yield Strength | 220 MPa | 240 MPa | 230 MPa |
| Salt Spray Hours | 720 | 600 | 480 |
| Cost/Ton (USD) | $1,050 | $980 | $1,200 |
Key advantage: DX52D offers 20% better corrosion resistance than G90 at 15% lower cost
Sustainability Features
- 88% recycled steel content in substrate
- Zinc recovery rate ≥99.5% in galvanizing process
- Water-based pretreatment chemicals (VOC <30g/m²)
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