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    Galvalume Steel Coil Solutions & Industrial Equipment

    Galvalume steel coils (55% Al-Zn coated steel coils) provide exceptional atmospheric corrosion resistance, superior thermal reflectivity, and long-term durability for building envelopes, rainwater gutter systems, and industrial metal forming. Manufactured via continuous hot-dip coating per ASTM A792, EN 10346, and AS 1397, these coils feature an alloy microstructure consisting of 55% aluminum, 43.4% zinc, and 1.6% silicon. They offer two to four times the lifespan of standard galvanized coils in demanding commercial, industrial, and coastal construction environments.

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      About Galvalume Steel Coil Solutions & Industrial Equipment

      Galvalume steel coil technology represents a proven standard in architectural metal building components, offering dramatic corrosion resistance improvements over conventional zinc-coated steels. The 55% aluminum-zinc alloy coating combines the galvanic barrier protection of zinc with the passive barrier endurance of aluminum oxide. In atmospheric exposure, the microscopic dendritic alloy matrix allows zinc-rich regions to corrode sacrificially to seal cut edges and scratch defects, while the aluminum-rich network maintains an inert physical armor against moisture, acid rain, and airborne salts.

      Crucial metallurgical specifications encompass coating weight designations from AZ50 (150 g/m² total both sides) up to AZ180 for severe marine and industrial microclimates. Surface finishes include regular spangle with fingerprint-resistant transparent or tinted resin coatings (Anti-Fingerprint / AFP treatment), which eliminate chemical staining during handling, minimize roll forming lubricant requirements, and provide a uniform aesthetic sheen without oil contamination.

      Mechanical properties conform strictly to international standards including ASTM A792M (CS Types A/B/C, FS, and Structural Steels SS33 to SS80), EN 10346 (DX51D+AZ through S350GD+AZ), and JIS G3321 (SGLCC/SGLCD). Precision tension leveling ensures tension-free strip flatness with camber under 3 mm per 2000 mm, enabling high-speed roll forming of standing seam roofing, architectural wall cladding, and deep lock-seam gutters without wrinkling.

      Applications

      • Architectural Seamless Rainwater Gutter & Downpipe Forming

        Premium 55% Al-Zn Galvalume steel coils roll-formed into continuous K-style and box rainwater gutters, delivering superior atmospheric corrosion resistance. Applications: Commercial office roofs, residential villa eaves gutters, and logistics warehouse exterior rainwater systems. Features: AZ150 metallic coating protection, smooth surface spangle finish, zero micro-fracturing on tight lockseam bends, and 30-year design life.

      • Long-Span Industrial Warehouse Roofing & Wall Cladding

        High-tensile structural Galvalume steel coil roll-formed into trapezoidal roofing sheets and architectural wall panels with outstanding heat reflectivity. Applications: Heavy manufacturing facilities, airport maintenance hangars, and agricultural bulk storage facilities. Features: 70%+ thermal reflectivity lowering indoor cooling loads, ASTM A792 structural yield grades (CS, FS, SS Grade 50/80), and cut-edge self-healing.

      • High-Temperature Exhaust Flues & Industrial HVAC Ductwork

        Continuous heat-resistant Galvalume steel coil fabricated into spiral HVAC ventilation ducting, heating appliance flues, and oven casings. Applications: Commercial kitchen exhaust ductwork, industrial boiler flue stacks, and factory thermal ventilation systems. Features: Continuous temperature resistance up to 315°C (600°F) without surface discoloration or zinc peeling, and superior oxidation barrier.

      • Solar Photovoltaic Ground-Mount Purlins & Strut Channels

        Heavy-gauge Galvalume steel coil roll-formed into C/U/hat channels and torque tubes for utility-scale solar photovoltaic ground-mount arrays. Applications: Desert utility solar farms, commercial rooftop PV arrays, and solar agricultural greenhouse structures. Features: High resistance to severe desert atmospheric salt and soil corrosion, high strength-to-weight ratio, and tight roll-forming tolerances.

      • Automotive Heat Shields & Underbody Anti-Corrosion Liners

        Deep-drawing quality Galvalume steel coils stamped into automotive catalytic converter heat shields, muffler wraps, and underbody stone shields. Applications: Passenger car exhaust thermal barriers, heavy commercial truck muffler shielding, and engine compartment heat baffles. Features: Exceptional resistance to road salt corrosion, high thermal radiant barrier, and excellent deep-drawing stampability without coating delamination.

      Technical Overview

      ParameterInformation
      Coating Chemical Composition55% Aluminum, 43.4% Zinc, 1.6% Silicon (Al-Zn alloy)
      Coating Mass DesignationsAZ50 / AZ70 / AZ100 / AZ120 / AZ150 / AZ180 (g/m² total both sides)
      Thickness Range0.20 mm – 2.0 mm (Common: 0.30–0.80 mm for roofing and gutters)
      Width Range & Tolerances600 mm – 1250 mm (Slit coils down to 50 mm, tolerance ±0.2 mm)
      Steel Substrate GradesASTM A792 (CS, FS, SS33–SS80), EN 10346 (DX51D+AZ, S280GD–S350GD+AZ)
      Surface Treatment & FinishRegular Spangle, Anti-Fingerprint (AFP Clear/Blue/Green), Oiled/Dry, Chromated
      Thermal & Heat ReflectivitySolar Reflectance Index (SRI) ≥ 70, continuous heat resistance up to 315°C
      Coating Adhesion (Bend Test)0T – 2T 180° bend without coating flaking or peeling
      Coil Inner / Outer DiameterInner Diameter: 508 mm / 610 mm; Outer Diameter: up to 1500 mm (3–10 Tons)
      Standard ComplianceASTM A792/A792M, EN 10346, JIS G3321, AS 1397, ISO 9364

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      Related Information

      FAQ

      What is the exact chemical composition of the Galvalume alloy coating?

      The coating alloy consists of 55% aluminum, 43.4% zinc, and 1.6% silicon by weight, designed to optimize galvanic protection, barrier endurance, and coating adhesion onto the steel substrate.

      How does Galvalume corrosion resistance compare to standard hot-dip galvanized steel?

      Under identical atmospheric exposure, Galvalume (AZ150) delivers 2 to 4 times the service lifespan of standard G90 galvanized steel, and features 70%+ solar heat reflectivity that lowers indoor roof temperatures.

      What is the purpose of Anti-Fingerprint (AFP) resin treatment?

      Anti-Fingerprint treatment applies a thin transparent organic or acrylic resin film (1–2 µm) that prevents fingerprint oxidation, inhibits transit humidity white rust, and acts as a dry lubricant during roll forming.

      Can Galvalume coils be roll-formed into tight hems and lock-seams without coating cracking?

      Yes, our commercial and forming grade coils (DX51D+AZ / CS Type B) exhibit zero coating flaking or micro-cracking under a 0T–2T 180-degree bend test, ensuring seamless roll-forming and lock-seam integrity.

      What environments are NOT recommended for unpainted Galvalume?

      Unpainted Galvalume should not be installed in direct contact with wet concrete, animal confinement facilities with severe wet ammonia exposure, or in submerged marine splash zones without secondary protective barrier paint.

      What coil packaging standards are used to prevent transit moisture damage?

      Export packaging features waterproof anti-rust VCI paper, inner steel protection rings, galvanized corrugated steel outer sleeves, heavy steel side guards, and 4 radial plus 3 circumferential heavy steel strapping bands.

      What mill test certificates (MTC) accompany Galvalume coil shipments?

      Shipments include EN 10204 3.1 MTCs documenting base chemical composition, coating weight triple-spot test (AZ g/m²), yield/tensile strength, elongation, and T-bend test results.

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