What key indicators should I consider when purchasing galvanized coils?
Zinc layer weight, substrate material, thickness/width tolerance, surface condition, adhesion, corrosion resistance, and brand reputation.
How to determine the surface quality of galvanized coils?
No noticeable uneven zinc spangles, no missing plating, no scratches, no oxidation spots, and uniform color.
What are the quality acceptance criteria for galvanized coils?
Domestic standards include GB/T 2518-2019 (hot-dip galvanizing) and GB/T 15675-2008 (electrogalvanizing), and international standards include ASTM A653 and EN 10346.
What are the main quality differences between galvanized coils from different manufacturers?
Substrate purity, galvanizing process control, zinc layer uniformity, surface treatment accuracy, and tolerance control.
What are the storage requirements for galvanized coils?
Keep them in a dry and ventilated environment, avoid moisture and rain, and keep them away from corrosive substances such as acids and alkalis. Store flat and stack them (avoid heavy pressure). Oiled coils must be sealed.