Authentic Steel specializes in manufacturing prime high zinc coating galvanized steel coils (heavy zinc coated GI coils) designed for extreme weather durability, high humidity, and highly corrosive outdoor environments. By applying a dense continuous hot-dip zinc layer ranging from Z275 up to Z600 , our heavy zinc coils provide long-term cathodic protection, preventing oxidation and base steel degradation for decades without requiring secondary surface treatment.
High zinc galvanized steel coils are crucial for demanding industrial projects, coastal infrastructure, and agricultural installations where standard zinc layers fail prematurely. The thick zinc coating forms a self-healing protective barrier against salt spray, atmospheric pollution, chemical fumes, and severe precipitation.
Zinc Coating Mass: Z275, Z350, Z450, Z600 (Dual-sided continuous hot-dip)
Thickness Range: 0.30mm to 3.50mm precise gauge control)
Width Availability: 914mm, 1000mm, 1200mm, 1219mm, 1250mm, 1500mm, or slitted precision strips
Surface Finish Options: Regular Spangle, Minimized Spangle, Zero Spangle (Extra Smooth)
Substrate Mechanical Grades: Commercial Quality (CQ / DX51D+Z), Structural Quality (S280GD+Z, S350GD+Z, S550GD+Z / ASTM Grade 33, 50, 80)
Surface Passivation: Chromated (Cr3+/Cr6+ free), Oiled, Anti-Fingerprint (AFP), Skin-Passed
Compliance Standards: ASTM A653 / A653M, EN 10346, JIS G3302, ISO 1461, GB/T 2518
Solar PV Mounting Structures: Utilized for solar panel ground mounting frames, structural C/U/Hat channels, and tracker posts requiring 25+ years of outdoor anti-corrosion life.
Agricultural & Livestock Facilities: Essential for modern poultry houses, piggery framing, grain storage silos, and greenhouse framing exposed to organic ammonia and humidity.
Coastal & Marine Infrastructure: Applied in seaport warehouse roofing, seaside wall cladding, marine storage enclosures, and offshore containment facilities.
Highway & Power Infrastructure: Formed into heavy-duty cable trays, high-voltage power transmission tower framing, highway noise barriers, and guardrails.
Ultra-Uniform Zinc Layer Adhesion: Engineered with automated air-knife gauge technology, ensuring even zinc distribution across both sides without flaking, peeling, or cracking during cold roll-forming or heavy bending.
Salt-Spray Tested Quality: Our heavy zinc coils undergo rigorous neutral salt spray (NSS) chamber testing, guaranteeing proven corrosion resistance matching global engineering standards.
Export-Grade Heavy Packaging: Wrapped in multi-layer VCI anti-rust paper, waterproof plastic film, heavy outer steel drums, and reinforced wooden skids to prevent white rust formation during ocean transit.
