Hot-Dip GalvalumeĀ® Steel Sheet: Advanced Aluminum-Zinc Alloy Coated Steel for Extreme Environmentsā
Hot-dip Galvalume Steel Sheetā Product Overviewā
Hot-dip GalvalumeĀ® steel sheet is a high-performance, corrosion-resistant material coated with a ā55% aluminum, 43.5% zinc, and 1.5% silicon alloyā via continuous hot-dip processing. Engineered to surpass traditional galvanized steel, this innovative coating delivers ā3Ć superior corrosion resistanceā, ā1,500+ hours of salt spray protectionā (ASTM B117), and ā30+ years of service lifeā in harsh conditions. Compliant with āASTM A792ā, āEN 10346ā, and āJIS G3321ā, GalvalumeĀ® is ideal for roofing, automotive, HVAC, and industrial applications requiring durability and thermal efficiency.
āKey Technical Specificationsā
ā1. Base Material & Dimensionsā
- āThicknessā: 0.12mm (ultra-thin cladding) to 6.00mm (structural beams) Ā±0.03mm tolerance
- āWidthā: 600ā1,500mm (compatible with roll-forming, stamping, and laser cutting)
- āCoating Weightā: 30ā185g/mĀ² (8ā50Āµm per side)
- āDensityā: 3.75g/cmĀ³ (alloy layer), 7.85g/cmĀ³ (base steel)
ā2. Alloy Coating Compositionā
| Element | Content (%) | Role |
|---|---|---|
| Aluminum | 55ā58 | Forms protective oxide barrier |
| Zinc | 41ā43 | Sacrificial corrosion protection |
| Silicon | 1.5ā2.0 | Prevents brittle Fe-Al intermetallic formation |
ā3. Mechanical Propertiesā
| Grade (EN 10346) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (A80%) | Bendability |
|---|---|---|---|---|
| DX51D+AZ | 240ā380 | 270ā500 | ā„22% | 0t (180Ā°) |
| S350GD+AZ | ā„350 | ā„420 | ā„16% | 1t (90Ā°) |
| S550GD+AZ | ā„550 | ā„550 | ā | Not recommended |
Tested per ISO 6892-1 tensile standards
āSuperior Performance Featuresā
- āEnhanced Corrosion Resistanceā:
- The aluminum-rich matrix forms a āself-healing AlāOā layerā upon exposure, reducing red rust by ā85% vs. G90 galvanized steelā.
- Salt spray resistance: ā1,500+ hoursā (ASTM B117) vs. 900 hours for G90.
- āThermal Efficiencyā:
- Solar reflectance: ā75%ā (ASTM E1918), reducing rooftop temps by ā15ā20Ā°Cā and cooling costs by ā18ā25%ā.
- āHigh-Temperature Stabilityā:
- Maintains integrity up to ā315Ā°Cā (vs. 200Ā°C for galvanized steel), ideal for exhaust systems and fire-rated construction.
- āAesthetic Versatilityā:
- āZero-spangle finishā (Ra 0.8Āµm) for premium painted surfaces.
- āAnti-fingerprint treatmentā (Code N5) prevents oxidation stains in humid environments.
āManufacturing Processā
- āHot-Dip Alloyingā:
- Steel cleaning: 3-stage alkaline degreasing (pH 11.5, 65Ā°C)
- Continuous annealing: 730Ā°C in 10% Hā + 90% Nā atmosphere
- Alloy bath immersion: 590Ā°C with 1.5% Si for interlayer adhesion
- āSurface Treatment Optionsā:
- āChromate passivation (Code C)ā: 0.5Āµm layer for indoor storage
- āPVDF coatingā: 25Āµm fluoropolymer for coastal architecture
āIndustry Applicationsā
| Sector | Use Case | Recommended Coating |
|---|---|---|
| āConstructionā | Standing seam roofing | 90g/mĀ² AZ + PVDF |
| āAutomotiveā | Mufflers & heat shields | 150g/mĀ² AZ (Code N5) |
| āAppliancesā | Refrigerator backplates | 60g/mĀ² AZ + epoxy |
| āAgricultureā | Grain silo roofs | 120g/mĀ² AZ + polyester |
āGlobal Material Equivalentsā
| China | Europe | USA | Japan |
|---|---|---|---|
| DC51D+AZ | DX51D+AZ | ASTM A792 | SGLCC |
| S350GD+AZ | S350GD+AZ | CS Type B | SGLC490 |
āSustainability & Complianceā
- āRecycled Contentā: 92% post-industrial steel scrap
- āLEED Contributionsā: 3ā6 points for solar reflectance & thermal emittance
- āRoHS Complianceā: Cadmium <0.01%, Lead <0.05%
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