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Introduction to the Characteristics of Galvanized Strip Steel
Hot-dip galvanized strip steel is produced by continuously immersing hot-rolled or cold-rolled steel strip in a molten zinc bath. When supplied as rectangular flat sheets after slitting, it is referred to as hot-dip galvanized sheet; when supplied in coil form after coiling, it is called hot-dip galvanized coil. Accordingly, hot-dip galvanized strip steel can be categorized into hot-rolled galvanized sheet coils and cold-rolled hot-dip galvanized strip steel. These products are primarily used in fields such as construction, home appliances, automotive, containers, transportation, and household applications—particularly in industries like steel structure construction, automobile manufacturing, and steel silo fabrication.
Their main characteristics include strong corrosion resistance, excellent surface quality, ease of deep processing, and cost-effectiveness.
Product standards: Comply with enterprise or national standards.
Produced by continuous hot-dip or cold-rolled steel, these strips are intended for general-purpose or structural applications. The typical supply range for hot-dip galvanized strip steel is as follows: thickness (0.3 mm to 3.5 mm), width (800 mm to 1830 mm), and length (sheets: 1000 mm to 6000 mm; coils: inner diameter 610 mm).
Galvanized strip steel refers to steel sheets whose surfaces are coated with a layer of zinc. Galvanizing is a commonly used, cost-effective, and efficient corrosion protection method; roughly half of the world’s zinc production is dedicated to this process.
According to production and processing methods, they can be classified into the following categories:
Hot-dip galvanized strip steel. Thin steel sheets are immersed in a bath of molten zinc, causing a thin layer of zinc to adhere to their surfaces. Currently, the primary production method is continuous galvanizing—where coils of steel sheet are continuously immersed in a galvanizing bath containing molten zinc to produce galvanized strip steel.
Alloyed galvanized strip steel. This type of steel sheet is also manufactured using the hot-dip process; however, immediately after exiting the bath, it is heated to around 500°C, allowing an alloy film of zinc and iron to form on its surface. Such galvanized sheets exhibit excellent paint adhesion and weldability.
Electro-galvanized strip steel. This type of galvanized steel sheet, manufactured by electroplating, exhibits excellent formability. However, its coating is relatively thin and its corrosion resistance is inferior to that of hot-dip galvanized sheets.
Single-sided galvanized strip steel and double-sided differential galvanized strip steel. Single-sided galvanized strip steel refers to products that are galvanized on only one side. In terms of welding, painting, rust prevention, and processing, it exhibits better adaptability than double-sided galvanized sheet. To overcome the disadvantage of the uncoated side in single-sided galvanized strip steel, there is another type—double-sided differential galvanized strip steel—which features a thin layer of zinc applied to the other side as well.
Alloy and composite galvanized strip steel. It is strip steel that is alloyed or even coated in a composite manner using zinc and other metals such as aluminum, lead, and zinc. This type of steel sheet not only boasts excellent coating performance;
In addition to the five types mentioned above, there are also color-coated galvanized strip steel, printed and coated galvanized strip steel, and polyvinyl chloride-laminated galvanized strip steel. However, hot-dip galvanized strip steel remains the most commonly used type today.
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