Thick Steel Coil Galvan Sheet Big Flowers Manufacturer Tangshan Z275 Small Spangle Factory Galvanized Steel Coil GI

Galvanized coil, a thin steel sheet that is dipped in a bath of molten zinc to adhere a layer of zinc to its surface. It is mainly produced by the continuous galvanizing process, that is, the coiled steel plate is continuously dipped in the galvanizing tank with molten zinc to make galvanized steel plate, alloyed galvanized steel plate. This kind of steel panel is also made by hot dip method, but it is heated to about 500°C immediately after coming out of the tank, so that it can form an alloy film of zinc and iron. This galvanized coil has good paint adhesion and weldability.

High-purity zinc layer (electro-galvanized layer) cannot form spangles. For example, add tin (<0.5%), solidify at 198°C; add cadmium, solidify at 264°C; add lead, solidify at 317°C; add antimony (<0.3%), solidify at 409°C; or use steam flow or O2 flow spraying the surface of the galvanized layer can generate crystallization nuclei early and form large spangles.

In fact, spangles are only of ornamental value and have no actual use price. On the contrary, it is not good in terms of anti-corrosion, and the surface appears uneven after painting. Now people ask to minimize spangle or eliminate spangle. In order to obtain small spangles, when galvanizing, when the zinc liquid is close to the solidification temperature, water droplets with a diameter of less than 0.1mm are immediately sprayed on the surface of the galvanized sheet to form small and uniform crystal nuclei, in order to obtain smooth zinc flowers. And then temper rolling with a reduction of less than 1%. Small spangles are suitable for painting, and smooth spangles are suitable for deep drawing.