Authentic Steel provides precision-engineered light and medium coating Zinc-Aluminum-Magnesium (ZAM) steel coils with coating weights ranging from ZAM 60g/m² to ZAM 150g/m². By introducing exact proportions of magnesium and aluminum into the molten zinc bath, ZAM technology forms a dense, continuous micro-crystalline protective film composed of zinc primary crystals and ternary eutectic structures.
Light and medium coating ZAM steel coils bridge the gap between standard galvanized steel and heavy-duty structural alloy sheets. Designed for high-speed automated fabrication, stamping, and roll-forming, these coils deliver superior corrosion resistance at a fraction of the coating weight compared to traditional GI, making them an ultra-efficient, cost-effective solution for precision manufacturing and light structural applications.
Coating Mass Specification: ZAM 60, ZAM 80, ZAM 100, ZAM 120, ZAM 150 g/m² (Total dual-sided coating weight)
Alloy Composition Spectrum: Low-to-Medium Aluminum/Magnesium alloy ratio optimized for high ductility and paint adhesion
Substrate Mechanical Grades: Commercial Forming Quality (DX51D+ZM, DX52D+ZM), Deep Drawing Quality (DX53D+ZM, DX54D+ZM), Structural High-Yield Grades (S280GD+ZM to S350GD+ZM)
Gauge Thickness Capability: 0.40 mm to 2.50 mm (Tight tolerance gauge control)
Available Coated Widths: 600 mm, 914 mm, 1000 mm, 1200 mm, 1250 mm, 1500 mm, or custom slitted precision coils
Surface Passivation & Oil Options: Chromate-Free Passivation, Anti-Fingerprint Sealing (Clear/Tinted), Lightly Oiled, Dry
Compliance International Standards: EN 10346 (ZM series), ASTM A1046 / A1046M, JIS G3323 (SGMC/SGHC), GB/T 34211
Automotive Parts & Underbody Components: Used for vehicle chassis reinforcement plates, seat frame channels, window regulator rails, and structural bracket stampings needing severe corrosion protection without excess weight.
Electrical Cable Tray & HVAC Enclosures: Formed into ventilated cable ladders, wire mesh tray supports, air conditioning chassis frames, and ventilation ducting exposed to humid indoor or sheltered outdoor environments.
Light Steel Framing & Drywall Profiles: Applied in light-gauge steel framing (LGSF), ceiling stud channels, drywall tracks, and purlins requiring rapid assembly and cut-edge rust resistance.
Precision Stamping & Appliance Cabinets: Utilized in home appliance structural supports, outdoor electrical junction boxes, mounting brackets, and agricultural equipment covers.
Active Cut-Edge Self-Healing Mechanism: During atmospheric exposure, magnesium ions dissolve from the coating and migrate across sheared steel edges, forming a tight, insoluble protective film of Simonkolleite that stops cut-edge red rust.
Exceptional Tool Lubricity & Stamping Performance: The ternary alloy coating has a lower friction coefficient and higher hardness than traditional zinc coatings, minimizing press die galling and zinc flaking during continuous high-speed stamping.
Lower Coating Weight, Equivalent Protection: A ZAM 120g/m² coating provides equal or superior corrosion endurance to a traditional Z275 heavy GI coating, yielding higher total linear meters per metric ton and significant material cost savings.
