Main Types of Galvanized Steel Sheets

Galvanized steel sheets are mainly classified by production process and coating characteristics, with the core categories as follows:
1. Classification by Production Process
– Hot-dip galvanized steel sheet: The steel sheet is immersed in molten zinc to form a coating. It features a thick coating with strong adhesion, excellent corrosion resistance, and relatively economical cost.
– Electrogalvanized steel sheet: A zinc coating is deposited on the surface of the steel sheet through electrolysis. It has a uniform, fine, and thickness-controllable coating with high surface finish, but its corrosion resistance is weaker than that of hot-dip galvanized steel sheet.
2. Classification by Coating Characteristics
– Alloyed galvanized steel sheet: After hot-dip galvanizing, it undergoes high-temperature treatment to form a zinc-iron alloy layer between the zinc coating and the steel substrate, which has both good corrosion resistance and formability.
– Single-sided/double-sided galvanized steel sheet: Zinc coating is applied to only one side or both sides of the steel sheet according to application requirements. Single-sided galvanized steel sheet is suitable for scenarios where only one-side protection is needed.