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Galvanized Coils: HDG/EG Process, Zinc Layers (Z60/Z180), Specs & Grades (SGCC/DX51D)
Galvanized coil is an anti-corrosion coil that uses cold-rolled steel coil or hot-rolled steel coil as the substrate, and is evenly covered with a zinc metal layer on the surface through hot-dip or electroplating processes. Its core value:
Super strong rust prevention: The zinc layer isolates water and oxygen, and even if it is scratched, it protects the steel through the “sacrificial anode” principle;
Extended life: Ordinary steel has a lifespan of 3-5 years, while galvanized coils can reach 20-50 years outdoors;
Convenient processing: It can be directly cut, stamped, and bent, and is a basic material for the construction/home appliance/automotive industries.
Features:
The zinc layer is thicker (usually 40-275g/㎡), and has stronger corrosion resistance
The surface is shiny zinc flower or no zinc flower (small zinc flower is more conducive to painting)
Low cost, accounting for more than 80% of the market share
Features:
The zinc layer is thin (10-50g/㎡) and uniform, suitable for precision parts
The surface is fine and without zinc flower, and can be sprayed directly
High cost, mostly used in high-end home appliances/electronics
Parameter | Example Value | Description |
Substrate thickness | 0.3mm-3.0mm | determines material strength |
Zinc layer code | Z60/Z180/Z275 | Z=zinc layer, number=gram weight |
Roll width | 1000mm/1250mm | needs to match the width of the flattening machine |
Inner diameter | 508mm/610mm | affects the adaptability of the coiling equipment |
Zinc layer code | Single-sided minimum coating (g/㎡) | Equivalent thickness (μm) | Applicable scenarios |
Z60 | 30 | 4.2 | Indoor dry environment |
Z120 | 60 | 8.4 | Ordinary building roof/wall |
Z180 | 90 | 12.6 | Industrial area/high humidity building |
Z275 | 135 | 18.5 | Coastal/chemical plant harsh environment |
National standard (GB): DX51D+Z (general purpose), DX52D+Z (stamping grade), DX53D+Z (deep drawing grade)
Japanese standard (JIS): SGCC (ordinary substrate), SGCH (high-strength substrate
European standard (EN): DX51D, DX54D (+Z represents hot-dip galvanizing)
American standard (ASTM): A653 (CS type/FS type)
Determine the process: choose hot-dip galvanizing (GI) for outdoor heavy-duty corrosion protection, and choose electroplating galvanizing (EG) for precision parts
Check the parameters: choose zinc layer according to the environment (humid environment ≥ Z180), choose brand according to processing (choose DX53D for stamping)
Check the surface: chromium-free passivation is required for export, and fingerprint-resistant treatment is selected for subsequent spraying
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