Hot-dip Galvalume Steel Sheet

Hot-dip Galvalume® steel sheet is a high-performance, corrosion-resistant material coated with a ‌55% aluminum, 43.5% zinc, and 1.5% silicon alloy‌ via continuous hot-dip processing. Engineered to surpass traditional galvanized steel, this innovative coating delivers ‌3× superior corrosion resistance‌, ‌1,500+ hours of salt spray protection‌ (ASTM B117), and ‌30+ years of service life‌ in harsh conditions. Compliant with ‌ASTM A792‌, ‌EN 10346‌, and ‌JIS G3321‌, Galvalume® is ideal for roofing, automotive, HVAC, and industrial applications requiring durability and thermal efficiency.

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Product Introduction

Hot-Dip Galvalume® Steel Sheet: Advanced Aluminum-Zinc Alloy Coated Steel for Extreme Environments‌


Hot-dip Galvalume Steel Sheet‌ Product Overview‌

Hot-dip Galvalume® steel sheet is a high-performance, corrosion-resistant material coated with a ‌55% aluminum, 43.5% zinc, and 1.5% silicon alloy‌ via continuous hot-dip processing. Engineered to surpass traditional galvanized steel, this innovative coating delivers ‌3× superior corrosion resistance‌, ‌1,500+ hours of salt spray protection‌ (ASTM B117), and ‌30+ years of service life‌ in harsh conditions. Compliant with ‌ASTM A792‌, ‌EN 10346‌, and ‌JIS G3321‌, Galvalume® is ideal for roofing, automotive, HVAC, and industrial applications requiring durability and thermal efficiency.


‌Key Technical Specifications‌

‌1. Base Material & Dimensions‌

  • ‌Thickness‌: 0.12mm (ultra-thin cladding) to 6.00mm (structural beams) ±0.03mm tolerance
  • ‌Width‌: 600–1,500mm (compatible with roll-forming, stamping, and laser cutting)
  • ‌Coating Weight‌: 30–185g/m² (8–50µm per side)
  • ‌Density‌: 3.75g/cm³ (alloy layer), 7.85g/cm³ (base steel)

‌2. Alloy Coating Composition‌

Element Content (%) Role
Aluminum 55–58 Forms protective oxide barrier
Zinc 41–43 Sacrificial corrosion protection
Silicon 1.5–2.0 Prevents brittle Fe-Al intermetallic formation

‌3. Mechanical Properties‌

Grade (EN 10346) Yield Strength (MPa) Tensile Strength (MPa) Elongation (A80%) Bendability
DX51D+AZ 240–380 270–500 ≥22% 0t (180°)
S350GD+AZ ≥350 ≥420 ≥16% 1t (90°)
S550GD+AZ ≥550 ≥550 Not recommended

Tested per ISO 6892-1 tensile standards


‌Superior Performance Features‌

  1. ‌Enhanced Corrosion Resistance‌:
    • The aluminum-rich matrix forms a ‌self-healing Al₂O₃ layer‌ upon exposure, reducing red rust by ‌85% vs. G90 galvanized steel‌.
    • Salt spray resistance: ‌1,500+ hours‌ (ASTM B117) vs. 900 hours for G90.
  2. ‌Thermal Efficiency‌:
    • Solar reflectance: ‌75%‌ (ASTM E1918), reducing rooftop temps by ‌15–20°C‌ and cooling costs by ‌18–25%‌.
  3. ‌High-Temperature Stability‌:
    • Maintains integrity up to ‌315°C‌ (vs. 200°C for galvanized steel), ideal for exhaust systems and fire-rated construction.
  4. ‌Aesthetic Versatility‌:
    • ‌Zero-spangle finish‌ (Ra 0.8µm) for premium painted surfaces.
    • ‌Anti-fingerprint treatment‌ (Code N5) prevents oxidation stains in humid environments.

‌Manufacturing Process‌

  1. ‌Hot-Dip Alloying‌:
    • Steel cleaning: 3-stage alkaline degreasing (pH 11.5, 65°C)
    • Continuous annealing: 730°C in 10% H₂ + 90% N₂ atmosphere
    • Alloy bath immersion: 590°C with 1.5% Si for interlayer adhesion
  2. ‌Surface Treatment Options‌:
    • ‌Chromate passivation (Code C)‌: 0.5µm layer for indoor storage
    • ‌PVDF coating‌: 25µm fluoropolymer for coastal architecture

‌Industry Applications‌

Sector Use Case Recommended Coating
‌Construction‌ Standing seam roofing 90g/m² AZ + PVDF
‌Automotive‌ Mufflers & heat shields 150g/m² AZ (Code N5)
‌Appliances‌ Refrigerator backplates 60g/m² AZ + epoxy
‌Agriculture‌ Grain silo roofs 120g/m² AZ + polyester

‌Global Material Equivalents‌

China Europe USA Japan
DC51D+AZ DX51D+AZ ASTM A792 SGLCC
S350GD+AZ S350GD+AZ CS Type B SGLC490

‌Sustainability & Compliance‌

  • ‌Recycled Content‌: 92% post-industrial steel scrap
  • ‌LEED Contributions‌: 3–6 points for solar reflectance & thermal emittance
  • ‌RoHS Compliance‌: Cadmium <0.01%, Lead <0.05%

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G90 Galvanized Sheet supplier

Luo Kaiwei Steel Company is a comprehensive steel supplier that produces a variety of carbon steel plates, carbon steel pipes, galvanized steel, carbon steel coils, and steel profiles.

Luo Kaiwei Steel Company is a multi-ISO certified steel manufacturer specializing in carbon steel plates, pipes and galvanized coils since 2010. Competitive prices and ASTM/JIS compliant. Get instant quotes for bulk orders and global shipping support.

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