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Let's to see the color steel sheet

Let's to see the color steel sheet

2020-10-29

Color steel plate is generally composed of base steel plate + galvanized/galvanized + color coating. Therefore, when we purchase color steel plates, we look at the composition of these three materials: the material and thickness of the base steel plate, the amount of galvanized steel, and the composition of the color coating. 


Base steel plate

The material of the base steel plate ranges from a yield strength of 300Mpa to 550Mpa, and a thickness from 0.3mm to 0.8mm. The choice of material and thickness is to serve the bearing capacity of the color steel plate. Due to different plate types and different purlin spacing requirements, it is impossible to give a universal standard. There are more mainstream applications: roof panel thickness 0.6mm, wall outer panel thickness 0.5mm, inner lining board (installed behind the purlin) 0.35mm. 


Galvanized steel

Steel is not as active as aluminum and zinc. Therefore, if aluminum and zinc are plated on the surface of the steel plate, aluminum and zinc will be oxidized first; then the aluminum oxide and zinc oxide produced will form a dense protective film on the surface of the steel to protect the inner layer. The steel plate is not corroded. Therefore, the amount of galvanizing/galvanizing ensures the corrosion resistance of the color steel plate. There are two types of anti-corrosion coatings: aluminum-zinc (55% aluminum) and zinc-plated. Among them, aluminum-zinc plating has better anti-corrosion performance. If it is used for roof panels, it does not need to be covered with color coating, and the original color of aluminum-zinc plating can be used directly. Of course, color coating can also be added to aluminum-zinc plating; , But because aluminum is expensive, zinc is cheap, and the amount of galvanized coating is increased, it is also a good choice for the anti-corrosion performance of color coated steel plates. The surface color of the color steel plate is realized with color coating. The outer surface of the color steel plate is called the front side, and the other side is the back side. Regardless of whether it is front or back, the coating includes two layers of primer and topcoat. Generally, the thickness of the topcoat on the front of the outer panel is 20μm and the primer is 5μm; the thickness of the topcoat on the front of the inner panel is 15μm and the primer is 5μm.

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