Galvanized steel sheet

Galvanized sheet: refers to the surface coated with a layer of zinc steel plate. Galvanizing is an economical and effective rust prevention method that is often used, and about half of the world's zinc production is used in this process.

According to production and processing methods can be divided into the following categories:

① Hot dip galvanized steel plate. The sheet steel is immersed in the melted zinc tank so that the surface is adhered to a layer of zinc sheet steel. At present, it is mainly produced by continuous galvanizing process, that is, continuous immersion of rolled steel plates in melting zinc plating tanks to make galvanized steel plates;

② Alloyed galvanized steel plate. This steel plate is also made by hot dipping, but after the tank is out, it is immediately heated to about 500 ° C to generate an alloy film of zinc and iron. The galvanized sheet has good adhesion and weldability of coating.

③ Electric galvanized steel plate. The galvanized steel plate made by electroplating has good workability. However, the coating is thin and the corrosion resistance is not as good as that of hot-dip galvanized sheet.

④ Single-sided plating and double-sided differential galvanized steel plate. Single-sided galvanized steel, that is, products that are only galvanized on one side. It has better adaptability than double-sided galvanized sheet in welding, coating, anti-rust treatment, processing and so on.

In order to overcome the shortcomings of uncoated zinc on one side, there is a galvanized sheet coated with a thin layer of zinc on the other side, that is, double-sided differential galvanized sheet;

⑤ Alloy, composite galvanized steel plate. It is a steel plate made of zinc and other metals such as aluminum, lead, zinc, and even composite plating. This steel plate not only has excellent anti-rust performance, but also has good coating performance;

In addition to the above five kinds, there are color galvanized steel plate, printed coated galvanized steel plate, polyvinyl chloride laminated galvanized steel plate and so on. But the most commonly used is still hot dip galvanized sheet.

Appearance:

(1) Surface state: Because of the different treatment methods in the plating process, the surface state of the galvanized plate is also different, such as ordinary zinc flowers, fine zinc flowers, flat zinc flowers, zinc flowers and phosphating surface. The German standard also provides for surface grades.

(2) Galvanized sheet should have a good appearance, no defects harmful to the use of the product, such as no plating, holes, cracks and scum, more than thick plating, abrasion, chromic acid dirt, white rust, etc. Foreign standards are not very clear about the specific appearance defects. Some specific defects should be specified in the contract when ordering.