Authentic Steel manufactures and exports premium bare galvalume steel coils (also known as Aluzinc or Zincalume steel coils), coated with a continuous hot-dip alloy composed of 55% Aluminum, 43.4% Zinc, and 1.6% Silicon. By combining the barrier-corrosion protection and high heat resistance of aluminum with the sacrificial galvanic protection of zinc, bare galvalume steel coils deliver up to 3 to 6 times greater corrosion resistance than standard hot-dip galvanized steel coils of equivalent coating thickness.
Bare galvalume steel coils feature a distinctive fine spangle appearance with a bright silver metallic luster. Engineered for severe outdoor atmospheric exposure, high ambient temperatures, and architectural roofing applications, bare galvalume coils are the premier choice for long-life building envelopes without the need for immediate post-painting.
Alloy Coating Composition: 55% Aluminum, 43.4% Zinc, 1.6% Silicon (Hot-dip Al-Zn alloy coating)
Coating Mass Range: AZ30 to AZ180 (Dual-sided continuous alloy protection, e.g., AZ70, AZ100, AZ150)
Thickness Range: 0.1mm to 3.5mm precision gauge control
Width Availability: 600mm, 752mm, 914mm, 1000mm, 1200mm, 1219mm, 1250mm, or slitted precision strips
Surface Finish Options: Bare Metallic Surface (Fine Spangle), Regular Aluzinc Pattern
Substrate Mechanical Grades: Commercial Quality (CQ / CS Type A, B, C / DX51D+AZ), Structural Quality (S350GD+AZ, S550GD+AZ / SS Grade 33, 50, 80 / G550 Full Hard)
Surface Passivation: Chromated (Passivated), Anti-Fingerprint (AFP), Oiled, Dry
Compliance Standards: ASTM A792 / A792M, EN 10346 (DX51D+AZ), JIS G3321 (SGLCC), GB/T 14978
Architectural Roofing & Wall Cladding: Formed into long-span standing seam roof panels, trapezoidal wall cladding sheets, and corrugated roof profiles for commercial, agricultural, and industrial buildings.
Solar PV Mounting & Industrial Framing: Used for lightweight solar structural framing, purlins, and outdoor solar equipment housings requiring long-term atmospheric durability.
High-Temperature & HVAC Equipment: Ideal for oven linings, furnace heat shields, chimney flues, dryer ducting, and commercial HVAC casing panels due to excellent heat reflectivity(>75%).
Home Appliances & Automotive Shields: Applied in toaster inner frames, outdoor air conditioner casings, automotive exhaust heat shields, and underbody protection panels.
High Thermal Reflectivity & Energy Efficiency: Our 55% Al-Zn alloy coating reflects over 75% of solar radiation, significantly reducing building cooling loads and thermal expansion stresses compared to standard GI steel.
Self-Healing Cut-Edge Protection: The microscopic intermetallic microstructure ensures that zinc sacrificially protects exposed cut edges and screw punch holes, eliminating rust staining along sheet boundaries.
Export-Grade Heavy Packaging: Sealed with VCI corrosion-inhibiting paper, PE waterproof film, heavy galvanized steel drum shells, outer steel corner protectors, and steel straps on sturdy wooden skids to prevent transit rust.
