🟧 Product Overview
Galfan steel coil (ZA), also known as Zn‑Al‑Mg coated steel, is produced by coating steel with a zinc‑aluminum‑magnesium alloy, typically:
- 95% Zinc
- 5% Aluminum + Magnesium
This alloy significantly improves:
- Corrosion resistance
- Cut‑edge protection
- Abrasion resistance
- Surface durability
- Service life in harsh environments
Galfan is considered the next‑generation alternative to HDG and Galvalume for high‑corrosion applications.
🟧 International Standards
EN 10346（Europe）
- DX51D+ZA
- DX52D+ZA
- DX53D+ZA
JIS Equivalent（Japan）
- Not officially standardized; equivalent to SGLC‑type performance
ASTM (Reference)
- No dedicated ASTM standard; performance comparable to A792 (AZ) and A653 (HDG)
🟧 Global ZA Coating Matrix
| Coating | Coating Mass (g/m²) | Typical Use |
|---|
| ZA90 | 90 g/m² | Indoor, general use |
| ZA120 | 120 g/m² | Outdoor, structural |
| ZA150 | 150 g/m² | Coastal, industrial, long‑life roofing |
🟧 Base Steel Grade Matrix
| Standard | Grade | Description | Formability |
|---|
| EN 10346 | DX51D+ZA | General forming | ★★★ |
| EN 10346 | DX52D+ZA | Drawing quality | ★★★★ |
| EN 10346 | DX53D+ZA | Deep drawing | ★★★★★ |
🟧 Zn‑Al‑Mg Coating Structure (Galfan Alloy)
The coating consists of:
- Zinc matrix – primary corrosion protection
- Aluminum – enhances barrier protection
- Magnesium – improves cut‑edge protection and self‑healing
- Intermetallic phases – increase durability and abrasion resistance
This alloy provides superior corrosion resistance, especially in:
- Coastal environments
- Industrial atmospheres
- High‑humidity regions
- Agricultural and ammonia‑rich environments
🟧 Product Specifications
Dimensions
- Thickness: 0.25 – 2.0 mm
- Width: 600 – 1500 mm
- Coil ID: 508 / 610 mm
- Coil Weight: 3 – 10 MT
Surface Finishes
- Smooth
- Zero spangle
- Anti‑finger coating (AFC)
- Chromated / Non‑chromated
- Oiled / Dry
- Skin‑passed
🟧 Mechanical Properties (typical)
| Grade | Yield Strength | Tensile Strength | Elongation |
|---|
| DX51D+ZA | 140–300 MPa | 270–500 MPa | ≥ 22% |
| DX52D+ZA | 140–260 MPa | 270–420 MPa | ≥ 26% |
| DX53D+ZA | 120–220 MPa | 260–380 MPa | ≥ 30% |
🟧 ZA vs. HDG vs. Galvalume vs. EG (Flagship Comparison)
| Property | Galfan (ZA) | Galvalume (AZ) | HDG (Zinc) | EG (Electro‑Zinc) |
|---|
| Corrosion Resistance | ★★★★★ | ★★★★ | ★★★ | ★★ |
| Cut‑Edge Protection | ★★★★★ | ★★★ | ★★ | ★★ |
| Abrasion Resistance | ★★★★★ | ★★★ | ★★★ | ★★ |
| Paintability | ★★★★ | ★★★★ | ★★★★ | ★★★★★ |
| Best Use | Coastal, industrial | Roofing, outdoor | Structural | Automotive |
🟧 Applications
Construction
- Long‑life roofing
- Wall cladding
- Structural components
- Coastal buildings
Industrial
- Chemical plants
- Industrial equipment
- HVAC systems
Agriculture
- Animal housing
- Greenhouses
- Ammonia‑rich environments
Outdoor
- Fencing
- Carports
- Solar mounting systems
🟧 Why Choose Galfan Steel Coil
- 3–10× corrosion resistance vs. galvanized steel
- Outstanding cut‑edge protection
- Excellent durability in harsh environments
- Long service life in coastal and industrial regions
- Ideal for high‑performance roofing and structural applications
🟧 Why Choose WelSteels
- Full range of ZA coatings (ZA90–ZA150)
- Stable mechanical and surface quality
- Advanced Zn‑Al‑Mg coating lines
- SGS / BV inspection available
- Export‑grade seaworthy packaging
- Reliable delivery for global projects
