High-quality light steel keel system
Galvanized steel sheet is a composite material produced by applying a zinc coating to the surface of ordinary carbon steel sheet via hot-dip galvanizing or electric galvanizing processes. It combines the inherent strength and ductility of steel with the corrosion resistance of zinc, making it the most widely used rust-resistant steel product; approximately half of the world’s zinc output is utilized in the production of galvanized steel sheet.
Galvanized steel sheet Classification and Characteristics
Electric galvanized steel sheet (SECC):
Produced via electroplating, this sheet features a uniform, fine coating that preserves the excellent work ability of the base cold-rolled steel. It can be treated to be fingerprint-resistant and sweat-resistant. It is commonly used for appliance casings and chassis panels where appearance is critical. Its drawbacks include a thinner coating and lower corrosion resistance compared to hot-dip galvanized steel.
Hot-dip galvanized steel sheet (SGCC):
Produced by immersing the steel sheet in molten zinc, resulting in a thicker zinc layer. It offers far superior rust prevention, scratch resistance, and environmental corrosion resistance compared to electric galvanized steel. Available in regular spangle, minimized spangle, and zero-spangle finishes; generally, a thicker zinc layer and smaller spangles indicate higher quality. It is widely used in structural applications, outdoor components, and load-bearing parts.
Alloyed hot-dip galvanized steel sheet (GA):
Subjected to heat treatment after hot-dip galvanizing to form a zinc-iron alloy coating. It offers excellent paint adhesion and weld ability, making it ideal for automotive body panels and structural parts requiring deep drawing.
Alu-zinc coated steel sheet (SGLD):
Features an aluminum-zinc alloy coating that offers corrosion resistance 2 to 6 times greater than standard hot-dip galvanized steel. It also boasts excellent heat resistance and thermal reflectivity, making it suitable for building roofing requiring high weather resistance and for components used in high-temperature equipment.
