Galvanized Steel Coil Introduction

For galvanized steel coils, the sheet steel is immersed in a molten zinc bath to make a sheet of zinc coated on its surface. It is mainly produced by continuous galvanizing process, that is, the rolled steel plate is continuously immersed in a plating tank with zinc melted to make galvanized steel plate; alloyed galvanized steel plate. This kind of steel plate is also manufactured by hot dip method, but immediately after it is out of the tank, it is heated to about 500 ℃ to form an alloy film of zinc and iron. This galvanized coil has good paint adhesion and weldability.
Galvanized coil products are mainly used in construction, light industry, automobile, agriculture, animal husbandry, fishery and commercial industries. Among them, the construction industry is mainly used to manufacture anti-corrosion industrial and civil building roof panels, roof grilles, etc.; the light industry industry uses it to manufacture home appliance shells, civil chimneys, kitchen utensils, etc., and the automotive industry is mainly used to manufacture corrosion-resistant parts of cars, etc; Agriculture, animal husbandry and fishery are mainly used for food storage and transportation, meat and aquatic products freezing processing tools, etc.

What is GI Coil?

Galvanized steel coil is a special type of steel coil used in many different applications in manufacturing and manufacturing environments. Coils of any type are flat products that are thin enough to be rolled into a coil or wound into a continuous coil. It can also be tiled and cut to any length or shape you want. Galvanized steel coil helps users apply it to outdoor fabrication projects.

Difference Between Galvanized Steel Coil and Carbon Steel Coil:

Galvanizing is done by dipping the steel sheet in a zinc bath to prevent rust and provide a harder surface. Galvanized steel is often used in applications that require bending to form, such as barrels or barrels, but are difficult to weld or otherwise use. Prices for galvanized steel are on the low end.
Mild steel made by mixing iron with carbon makes iron stronger but more brittle. As the carbon content increases, the product becomes stronger and harder, but more difficult to weld and heat. Medium carbon products are easy to machine cut and shape. They are still fairly cheap to produce and buy. Medium carbon steel is used to make rails, axles and pipes, etc.
High carbon steel is more difficult to weld because the alloy increases its strength and also causes it to harden quickly in flames. This characteristic makes it ideal for a variety of applications such as load-bearing springs, cutting edges and wires that must be very strong.

What is Galvanized Steel Coil used for?

Galvanized steel coils are widely used in the following industries:
In the construction industry: manufacture of structural elements low-rise buildings, light steel thin-walled structures, sandwich panels, thermal duct linings and various thermal insulation, air conditioning systems, metal roofing panels, profiled panels, culverts, entrance door cladding, elevators, PVC door and window reinforcement profiles, gypsum board European-style fasteners, etc.
In the automotive industry: manufacture of exterior and interior body parts, as well as repair of exterior mass transit body parts, such as buses and trams).
In the machine building and instrumentation industry: manufacture of housings for electromechanical equipment, household appliances, metering devices and packaging.
Manufacture of household items (tableware, bowls, buckets, water tanks, bathtubs, etc.)
Manufacturing Color Coated (and Other Types of Coated) Rolled Steel.

Which is better hot dipped or electro galvanized?

Hot-dipped galvanized steel coil is made from steel plate, which is dipped into the dissolved zinc bath, with a zinc layer on the surface. It mainly adopts the continuous galvanizing production process. That means the cold rolled coils are put into the dissolved zinc bath for continuous galvanizing process. Electrogalvanized sheet is made by electroplating pure zinc coating on one or both sides of carbon steel sheet. This continuous electrolytic coating process can be used to apply the coating to the steel surface in a very uniform thickness. In addition, the coated sheet has a smooth, matte appearance similar to the cold rolled sheet. Therefore, the surface quality is excellent for applications that require a high finish after painting, such as automotive exposed panels. The excellent control of coating thickness achieved by the electrolytic deposition process is beneficial for enhancing forming and joining operations, especially for more reliable results with automated and robotic welding systems. Both zinc and zinc-iron electro-galvanized coatings are easy to paint, but for good corrosion resistance, coated steel surfaces should be pretreated and primed prior to applying a topcoat finish.

Hot-dip galvanizing (HDG) technology is used to form a protective layer by dipping a steel strip into a bath of molten zinc. Hot-dip galvanized coils can be produced by continuous galvanizing lines with non-oxidizing annealing furnaces (Sendzimir method and its variants) or by using wet or dry fluxes (Cook-Norteman method and its modifications). Hot-rolled or cold-rolled non-annealed (full-hard) coils are used as raw material for continuous hot-dip galvanizing lines with non-oxidizing annealing furnaces. The production process involves electrochemical cleaning, drying and annealing of the strip to obtain the desired mechanical properties, followed by dipping the material in a bath of molten zinc and controlling the zinc thickness. The strip then undergoes forced cooling and finishing (passivation, oiling, levelling, drying and coiling of galvanized coils). The strip is then placed in a drawing furnace with a protective atmosphere, where the flux is dried and immersed in a bath of molten zinc. The flux completely removes residual pickling substances and moisture on the metal surface, and the film reduces the surface tension of the zinc, ensuring optimal wetting of the metal surface.
Electrolytic galvanizing is an electrochemical process in which a layer of zinc is applied in an acid or alkaline electrolyte bath. The main idea of ​​the technology is to utilize oxidation and reduction reactions, during which electrons move through an electron transport chain, while zinc ions in the electrolyte flow from the anode to the cathode. This coating is typically used on thin gauge materials; the coating thickness is typically 5-12 μm and it accurately follows the shape of the product. The absence of an intermediate brittle layer makes electrolytic zinc coatings more plastic than coatings applied by hot-dip galvanizing.

Benefits of Galvanized Steel Coil:

• Upscale. Every part of the plated part can be galvanized to be fully protected even in recesses, sharp corners and hidden places.
• Economical and practical. Galvanized coil rust cost is lower than other paint coatings.
• Strong corrosion resistance. In suburban environments, standard galvanized corrosion protection can last for over 50 years. In offshore areas, standard galvanized coatings can last for 20 years.
• Can be further processed. The metallurgical bond between the zinc coating and the steel becomes part of the surface.
• Strong resilience. The zinc coating forms a special metallurgical structure that can withstand mechanical damage during transportation and use.