.Coloured galvanized sheet refers to steel sheet with a layer of zinc on its surface. Galvanizing is an economical and practical anticorrosion method. About half of the world's zinc production is used in this process. Galvanized steel sheet is coated
with zinc metal to avoid corrosion and prolong its service life. This kind of galvanized steel sheet is called color galvanized steel sheet.
The recommended thickness, length and width of color-coated galvanized sheets and their errors are stipulated in relevant product specifications. Generally speaking, the thicker the color-coated galvanized sheet, the greater the allowable error, rather than the fixed 0.02-0.04 mm. Thickness error also has different requirements according to yield strength, tensile coefficient and so on. The error of length and width is 5 mm, and the thickness of plate is between 0.4 and 3.2.
Appearance: Appearance: Due to the different treatment methods in the painting process, the appearance of color-coated galvanized sheet is different, such as ordinary zinc flower, fine zinc flower, flat zinc flower, non-zinc flower and phosphating treatment. German norms also have a hierarchical appearance.
The coloured galvanized sheet should have a prominent appearance and should not have any defects harmful to the use of the product, such as no coating, holes, cracks and scum, scratches beyond the thickness of the coating, chromic acid dust, white rust, etc. Detailed rules on appearance defects are very clear in foreign codes. Deficiencies should be specified in the contract when ordering. Standard Value of Galvanized Quantity: Galvanized Quantity is an effective method to indicate the thickness of galvanized sheet. The galvanizing quantity is g/m2.