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Galvanized Steel Coil
According to production and processing methods, it can be divided into the following categories:
Hot-dip galvanized steel sheet. The thin steel plate is immersed in the molten zinc tank, so that a thin steel plate with a layer of zinc is adhered to the surface. At present, the continuous galvanizing process is mainly used for production, that is, the rolled steel sheet is continuously immersed in the galvanized bath with molten zinc to make the galvanized steel sheet;
Alloyed galvanized steel sheet. This kind of steel plate is also manufactured by hot dipping method, but after it is out of the tank, it is heated to about 500 ºC immediately to form an alloy film of zinc and iron. This kind of galvanized sheet has good paint adhesion and weldability
Galvanized steel strip is generally used to make steel pipes, such as greenhouse pipes, drinking water pipes, heating pipes, gas delivery pipes; it can also be used in construction, light industry, automobiles, agriculture, animal husbandry, fishery, and commerce.
Among them, the construction industry is mainly used to manufacture anti-corrosion industrial and civil building roof panels, roof grills, etc.; the light industry uses it to manufacture household appliance shells, civil chimneys, kitchen appliances, etc., and the automobile industry is mainly used to manufacture corrosion-resistant parts for cars, etc. ;Agriculture, animal husbandry and fishery are mainly used as food storage and transportation, meat and aquatic products refrigeration processing tools, etc.; commercial mainly used as material storage and transportation, packaging tools; steel structure sandalwood (C, Z steel); light steel keel, suspended ceiling Keel and so on.
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Production Process & Applications
A: Galvanized Steel Coil is used cold rolled steel coil as substrates by a continuous hot-dip process. This method tightly adheres the coating to the steel with an iron-zinc alloy bonding layer formed by a diffusion process while the heated steel strip is in contact with the molten zinc. One of the drawbacks of Galvanized is that if the Zinc coating is scratched off the steel, the Steel is left unprotected, and is subject to failure.
Q: Type of Galvanized Spangle ?
A: Galvanized with regular spangle, zinc-coated from 30g to 275g(g90). thickness from 0.15mm to 2.0mm. Regular spangle galvanized can be used in hot and wet outdoor places. For example fence, roofing, garage door, etc.
Galvanized with zero spangles, this kind of GI with brightly surface, zinc-coated from 30g to 2755g(g90). thickness from 0.12mm to 0.25mm. It could be used outdoor also. Currently mainly exported to Southeast Asia and Africa. It is cheaper than gi with regular spangle. This product can be processed later, for example, processed into stone coated tiles.
Q: The difference between hot-dip galvanized steel coil and electro-galvanized steel coil ?
A: A Hot-dip galvanized steel coil. The thin steel coil is immersed in the molten zinc tank, and the thin steel coil with a layer of zinc is adhered to the surface. At present, the continuous galvanizing process is mainly used for production, that is, the rolled steel sheet is continuously immersed in the molten zinc plating tank to make the galvanized steel coil.
Hot-dip galvanized sheet and electro-galvanized sheet have a big difference in the amount of galvanization. The amount of hot-dip galvanizing can not be too small, generally the minimum is 50-60g/m2 on both sides, and the maximum is 600g/m2. The galvanized layer of the electro-galvanized sheet can be very thin, the minimum is 15g/m2, but if the coating is thicker, the production line speed is very slow, which does not adapt to the technological characteristics of modern units, generally the maximum is about 100g/m2. Because of this, the production of electro-galvanized sheets is greatly restricted.
Hot-dip galvanized sheet generally has a thicker zinc layer, about 10um or more, and has strong anti-corrosion ability. So it is a commonly used galvanizing process. The electro-galvanized sheet is very thin, about 3-5um, and the hot-dip galvanized surface is rough, bright and serious. If there are spangles, the electroplating is smooth and dull (soiled).
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