Galvanized Sheets

What is Galvanized Sheets？

Galvanized steel sheet refers to a steel sheet with a layer of zinc on the surface for aesthetics and anti-rust purpose. It is most widely used in buildings and also applied as the base metal of color coated steel. Due to the different galvanizing processes, the zinc spangles will be different, including big spangles, regular spangles, small spangles, and zero spangles.

The substrate is hot rolling and cold rolling steel, which is with high strength, good processability, but is easy to corrosion. Through the galvanizing process, it will form a protective layer to prevent the substrate from rusting and prolong its service life. Here is how the zinc coating work: After zinc and oxygen reactions, there will be an oxide film to isolate the substrate from air and moisture to prevent oxidation. If the zinc layer scratches, somewhere around the zinc will melt to protect bare steel from corrosion.

The zinc layer thickness is usually expressed in Z + number. For example, Z275 refers to 275 g (20 µm) of zinc per square meter, which is the same as the G90 galvanized sheet. According to ASTM standards, G60 means the zinc layer is 180g/m².

Types of Galvanized Sheets

Electrogalvanized sheet: also known as cold galvanizing, uses electrochemical method to deposit a layer of zinc on the surface of steel sheet. This galvanizing method has simple process, but the coating is thin and the anti-corrosion time is relatively short.

Hot-dip galvanized sheet: The steel sheet is immersed in molten zinc liquid to make a layer of zinc adhere to its surface. The anti-corrosion performance of hot-dip galvanizing is better than that of electrogalvanizing, and it is suitable for outdoor long-term rust prevention occasions.

Advantages of Galvanized Sheets

• Strong and durable: galvanized sheet has high strength and toughness, and can withstand large external impact without deformation or damage.

• Moisture-proof and mildew-proof: galvanized sheet will not become moldy or damp due to the influence of environmental weather during use, maintaining stable product performance.

• Anti-rust and anti-corrosion: the galvanized layer can form a dense protective layer on the surface of the steel plate, effectively preventing the steel plate from being corroded and extending the service life.

• Convenient construction: galvanized sheet saves time and effort during construction and installation, and can be put into use without on-site painting, reducing construction costs.

• Strong plasticity: galvanized sheet can be processed in different ways, such as stamping, rolling, etc., to meet the needs of different shapes and sizes.

• Good heat resistance: galvanized sheet can maintain stable performance at higher temperatures and is not easy to deform or discolor.

Quality Control

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Applications of Galvanized Sheets

• Construction industry: galvanized sheets are used in balconies, window sills, warehouses, and roof shutters, providing excellent performance such as welding, spraying, and rust prevention.

• Household industry: galvanized sheets are used in household appliances such as refrigerators, microwave ovens, and washing machines, combining the characteristics of steel and zinc to provide a sturdy and durable use experience.

• Automobile industry: galvanized sheets are widely used in car body coverings, such as ceilings and car body panels, providing beautiful smoothness and corrosion resistance.

• Transportation industry: The durability of galvanized sheets is reflected in various containers, ship cabin partitions, etc., ensuring the safety and stability of the transportation process.

• Furniture industry: The plasticity of galvanized sheets makes them suitable for the manufacture of furniture products such as lampshades and desks to meet different design requirements.

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