AZ55 Galvalume Steel Sheet

The AZ55 Galvalume® steel sheet is a high-performance building material featuring a ‌55% aluminum, 43.5% zinc, and 1.5% silicon alloy coating‌ applied via hot-dip processing. With ‌3× superior corrosion resistance‌ vs. traditional galvanized steel (G90), this advanced composite material delivers ‌1,500+ hours of salt spray protection‌ (ASTM B117) and ‌30+ years of service life‌ in coastal, industrial, and high-humidity applications. Compliant with ‌ASTM A792‌, ‌EN 10346‌, and ‌JIS G3321‌, AZ55 excels in roofing, automotive, and HVAC systems requiring unmatched durability.
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Product Introduction

‌AZ55 Galvalume® Steel Sheet: Premium 55% Aluminum-Zinc Alloy Coated Steel for Extreme Environments‌


AZ55 Galvalume Steel Sheet‌ Product Overview‌

The AZ55 Galvalume® steel sheet is a high-performance building material featuring a ‌55% aluminum, 43.5% zinc, and 1.5% silicon alloy coating‌ applied via hot-dip processing. With ‌3× superior corrosion resistance‌ vs. traditional galvanized steel (G90), this advanced composite material delivers ‌1,500+ hours of salt spray protection‌ (ASTM B117) and ‌30+ years of service life‌ in coastal, industrial, and high-humidity applications. Compliant with ‌ASTM A792‌, ‌EN 10346‌, and ‌JIS G3321‌, AZ55 excels in roofing, automotive, and HVAC systems requiring unmatched durability.


‌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 (optimized for roll-forming and laser cutting)
  • ‌Coating Weight‌: 30–185g/m² (8–50µm per side)
  • ‌Alloy Density‌: 3.75g/cm³ (vs. 7.14g/cm³ for pure zinc)

‌2. Alloy Composition‌

Element Content (%) Role
Aluminum 55–58 Forms protective Al₂O₃ oxide layer
Zinc 41–43 Sacrificial corrosion protection
Silicon 1.5–2.0 Prevents Fe-Al intermetallic brittleness

‌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


‌Performance Advantages‌

  1. ‌Unmatched Corrosion Resistance‌:
    • The aluminum-rich matrix creates a ‌self-healing oxide barrier‌, reducing red rust by ‌85%‌ vs. G90 galvanized steel.
    • ‌1,500+ hours‌ salt spray resistance (ASTM B117) in marine environments.
  2. ‌Thermal Efficiency‌:
    • ‌75% solar reflectance‌ (ASTM E1918) lowers rooftop temps by ‌15–20°C‌, cutting cooling costs by ‌18–25%‌.
  3. ‌High-Temperature Stability‌:
    • Withstands ‌315°C continuous exposure‌ (vs. 200°C for galvanized steel), ideal for exhaust systems.
  4. ‌Aesthetic Versatility‌:
    • ‌Zero-spangle finish‌ (Ra 0.8µm) for premium painted surfaces.
    • ‌Anti-fingerprint treatment‌ (Code N5) prevents oxidation stains.

‌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
  • ‌Coating Reclaim‌: 97% alloy recovery rate
  • ‌RoHS Compliance‌: Lead <0.05%, Cadmium <0.01%

Product Show

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.

Tel: +86 15635685959

E-mail: [email protected]  

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