Galvalume Steel Corrugated Roof Sheet

Galvalume® steel corrugated roof sheets are high-performance building materials composed of a ‌55% aluminum, 43.5% zinc, and 1.5% silicon alloy coating‌ applied via hot-dip processing. Designed to outperform traditional galvanized steel, this innovative coating system provides ‌3× superior corrosion resistance‌, ‌2× higher heat reflectivity‌, and ‌30+ year service life‌ in harsh climates. Compliant with ‌ASTM A792‌, ‌EN 10346‌, and ‌JIS G3321‌ standards, Galvalume® is ideal for industrial, agricultural, and architectural applications requiring durability and energy efficiency.
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Product Introduction

‌Galvalume Steel Corrugated Roof Sheet: Advanced Protection for Extreme Environments‌


‌Galvalume Steel Corrugated Roof Sheet Product Overview‌

Galvalume® steel corrugated roof sheets are high-performance building materials composed of a ‌55% aluminum, 43.5% zinc, and 1.5% silicon alloy coating‌ applied via hot-dip processing. Designed to outperform traditional galvanized steel, this innovative coating system provides ‌3× superior corrosion resistance‌, ‌2× higher heat reflectivity‌, and ‌30+ year service life‌ in harsh climates. Compliant with ‌ASTM A792‌, ‌EN 10346‌, and ‌JIS G3321‌ standards, Galvalume® is ideal for industrial, agricultural, and architectural applications requiring durability and energy efficiency.


‌Key Advantages‌

  1. ‌Extreme Corrosion Resistance‌:
    • The aluminum-rich layer forms a self-healing oxide barrier, reducing red rust by ‌85%‌ vs. G90 galvanized steel.
    • Salt spray resistance: ‌1,500+ hours‌ (ASTM B117) in coastal environments.
  2. ‌Thermal Efficiency‌:
    • Solar reflectance: ‌75%‌ (ASTM E903), lowering rooftop temperatures by ‌20°C‌ and cutting cooling costs by ‌25%‌.
  3. ‌High-Temperature Stability‌:
    • Withstands sustained exposure to ‌315°C‌ without coating degradation.
  4. ‌Aesthetic Versatility‌:
    • Smooth, spangle-free surface (Ra 0.8µm) with ‌85+ gloss units‌ for premium painted finishes.

‌Technical Specifications‌

‌1. Base Material & Dimensions‌

  • ‌Thickness‌: 0.12mm (ultra-lightweight) to 6.00mm (structural) ±0.03mm tolerance
  • ‌Width‌: 600–1,500mm (optimized for corrugation profiles)
  • ‌Corrugation Depth‌: 15–50mm (meets ASCE 7-16 wind uplift requirements)

‌2. Alloy Coating Properties‌

Parameter Galvalume® G90 Galvanized
Coating Weight 150g/m² 275g/m²
Salt Spray Lifespan 1,500hrs 900hrs
Thermal Emittance 0.85 0.65

‌Mechanical Performance‌

Grade Yield Strength (MPa) Tensile Strength (MPa) Elongation (A80%)
DX51D+AZ 240–380 270–500 ≥22%
S350GD+AZ ≥350 ≥420 ≥16%
S550GD+AZ ≥550 ≥550

Tested per ISO 6892-1:2019 tensile standards


‌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 Finishing‌:
    • ‌Zero Spangle (Code M)‌: Laser-controlled crystallization
    • ‌Anti-Fingerprint (Code N5)‌: Silane-based nano-coating

‌Environmental Adaptability‌

Application Recommended Solution Service Life*
Coastal roofing 150g/m² AZ + PVDF coating 35+ years
Food processing plants 75g/m² AZ + epoxy primer 25–30 years
Solar farm mounting 90g/m² AZ + bare alloy 40+ years

Based on ISO 12944-7 corrosion category CX


‌Installation & Fabrication‌

  1. ‌Corrugation Profiles‌:
    • Trapezoidal (32mm depth): 6.0kN/m² load capacity
    • Sinusoidal (25mm depth): Ideal for curved structures
  2. ‌Fastening Systems‌:
    • EPDM-washered screws: 200mm spacing for cyclonic zones
    • Seam-clip locking: Withstands 160km/h winds
  3. ‌Cutting & Forming‌:
    • Laser cutting: 6m/min at 4kW (1.5mm sheet)
    • Press braking: 1.5× thickness minimum bend radius

‌Sustainability Features‌

  • ‌Recycled Content‌: 92% post-industrial steel scrap
  • ‌Coating Reclaim‌: 97% alloy recovery rate in remelting
  • ‌Energy Savings‌: Reduces building cooling loads by ‌18%‌ (ASHRAE 90.1 compliant)

‌Global Material Equivalents‌

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

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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.

Tel: +86 15635685959

E-mail: [email protected]  

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