Galvanized steel refers to a steel plate whose surface is coated with zinc. Galvanizing is a frequently used economical and effective anticorrosive method, and about half of the world’s zinc production is used for this process. Hot-dip galvanized steel has the advantages of ideal comprehensive properties such as corrosion resistance, forming and coating, as well as low cost and good appearance.
Galvanized steel application
Galvanized steel is mainly used in construction, light industry, automotive, agriculture, animal husbandry, fishery and commercial industries.
The construction industry is mainly used to manufacture anti-corrosive industrial supplies and panels, roof grids, balcony panels, windowsills, newsstands, warehouses, rolling doors, heaters, rainwater pipes, etc. used in civil construction houses;
The light industry uses it to make housings for household appliances, civilian chimneys, kitchen utensils, etc. The automotive industry is mainly used to make corrosion-resistant parts for cars, etc .;
Agriculture, animal husbandry and fishery are mainly used for grain storage and transportation, frozen processing of meat and aquatic products, etc .;
Commerce is mainly used for storage and transportation of materials, packaging appliances, etc. Household appliances such as refrigerators, washing machines, switch cabinets, air conditioners, microwave ovens, toasters, copiers, vending machines, fans, vacuum cleaners, etc. will also use galvanized sheet.
Classification of galvanized steel
Galvanized sheet is divided according to the layout: there are zinc flower galvanized sheet and non-zinc flower galvanized sheet.
According to zinc layer thickness: 80G zinc; 100G zinc; 120G zinc; 180G zinc; 275G zinc.
According to production and processing methods can be divided into the following categories:
(1) Hot-dip galvanized steel sheet. The steel sheet is immersed in a molten zinc bath, and a layer of zinc steel sheet is adhered to the surface. At present, it is mainly produced by continuous galvanizing process, that is, the coiled steel sheet is continuously immersed in a zinc plating bath with molten zinc to make a galvanized steel sheet;
(2) Galvanized steel sheet. This steel sheet is also manufactured by the hot-dip method, but immediately after it is out of the tank, it is heated to about 500 ° C to form an alloy thin film of zinc and iron. This galvanized sheet has good paint adhesion and weldability;
(3) Galvanized steel sheet. The galvanized steel sheet produced by electroplating has good workability. But the coating is thin, and the corrosion resistance is not as good as the hot-dip galvanized sheet;
(4) Single-side and double-side differential galvanized steel. Single-sided galvanized steel, that is, products with only one side galvanized. In welding, painting, anti-rust treatment and processing, it has better adaptability than double-sided galvanized sheet. In order to overcome the shortcomings of uncoated zinc on one side, there is another type of galvanized sheet coated with a thin layer of zinc on the other side, that is, a double-sided galvanized sheet;
(5) Alloy and composite galvanized steel sheet. It is made of zinc and other metals such as aluminum, lead, zinc, etc. and even composite plated steel plates. This steel sheet has both excellent anti-rust performance and good coating performance.
In addition to the above five types, there are color galvanized steel sheets, printed coated galvanized steel sheets, and polyvinyl chloride laminated galvanized steel sheets. However, the hot-dip galvanized sheet is still the most commonly used.
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