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Your Position: Home - Home Garden - What Is Galvanized Steel Coil?

What Is Galvanized Steel Coil?

Author: Fabricio

Aug. 26, 2021

Home & Garden


Galvanized Steel Sheet is defined as a carbon steel sheet coated with zinc on both sides. Galvanized Steel manufacturer produce galvanized steel coils with two main processes: continuous hot dip galvanizing and electro galvanizing. 



Continuous Hot Dip Galvanizing & Electrogalvanizing


The hot dip galvanizing process includes passing the steel through a molten zinc bath, and the another progress - electro galvanizing includes applying zinc through electrolytic treatment. As a result, the zinc layer is firmly adhered to the base metal through the iron-zinc bonding layer.


Galvanizing is one of the most effective and economical methods to protect bare steel from corrosive environments. Zinc is not only a barrier between the steel and the environment, but also sacrifices itself to protect the steel plate below. When two different metals are in contact and coupled with water and oxygen, sacrifice or current protection occurs. Zinc preferentially corrodes iron into steel. This protection prevents corrosion of the steel in areas not covered by zinc. Therefore, the diffusion of corrosion from cutting edge, drilling holes, and so on, is minimized. 



Galvanized steel coil in HVAC piping systems.jpg


Many people know galvanized steel that it is usually used for a variety of applications from HVAC piping systems to garden barrels. Home decorations to the trash. The shiny finish on the surface makes it visually appealing, but it is also more durable and corrosion resistant.



steel garden barrels.jpg



So, how is galvanized steel made? And where did the sequins come from? Let's find out.



How Is Galvanized Steel Made


Galvanized steel is carbon steel coated with zinc. The most common galvanizing method is the hot-dip process. The hot dip process involves immersing carbon steel in a molten zinc bath (approximately 680 degrees Fahrenheit). When the material is removed from the zinc bath and cooled, it reacts with oxygen in the air. This reaction causes zinc to become part of the steel (iron-zinc alloy bond). The new surface finish seems to have a crystalline finish or a bright finish.


Although this is the most common form of galvanizing, because the thickness of the final product is not easy to control, it is usually used for previously manufactured steel. Another method of galvanizing process is continuous galvanizing.



Galvanized steel coil.jpg



After the zinc bath, continuous galvanizing is applied to the surface of the continuous steel strip (coil). The coil is run at a speed of approximately 600 feet per minute. As the coil leaves the zinc bath, an additional layer of molten zinc is taken away. The excess zinc is removed using high pressure air (air knife) to form the desired thickness. The material is then allowed to cool, creating a glossy surface. Skip galvanized steel and continuous galvanizing allow for more accurate thickness control and are typically used on unproduced steel. As the thickness of the coating increases, the risk of losing some of the coating during fabrication or forming increases. 


Hot-dip galvanized steel sheets and plates are produced for applications where corrosion resistance is important. The galvanized coating extends the life of the final product and is ideal for manufacturers. Attractive surface finishes also satisfy consumers. 


More information about comparasion between general hot-dip galvanizing and continuous sheet galvanizing, just click here. 

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