Galvanized Steel Coil / Sheet
Galvanized steel is represented by cold-rolled and hot-rolled steel coils with a zinc coating that helps protect the steel from atmospheric corrosion. Galvanized steel coils are successfully used in industries where corrosion resistance, durability, strength and appearance are critical, and can be formed or coated with a variety of coatings.
Galvanized steel coils are widely used in the industries:
In the construction industry: manufacture of low-rise buildings, light steel thin-walled structures, sandwich panels, hot pipe linings and various insulation and conditioning systems, metal roof tiles, pressed panels, culvert pipes, structural elements for entrance door cladding, elevators, PVC window and door reinforcement profiles, plasterboard Euro fasteners, etc.
In the automotive industry: manufacture of external and internal body parts, as well as repair of external public transport body parts, such as buses and trams)
In the machine building and instrumentation industry: manufacture of electrical and mechanical equipment, household appliances, metering devices and housing for packaging
Manufacture of household goods (tableware, bowls, buckets, cans, bathtubs, etc.)
Manufacture of color coated (and other types of coated) rolled steel
Excellent anti-corrosion, paintability, and processability due to the self-sacrificing characterisiticof zinc.
Available to select and produce the desired amount of zinc gilded and in particula enables thick zinc layers.
Classified as either zero spangle or extra smooth depending on wheteher the sheet undergoes skin pass treatment.
There are two widely used methods of galvanizing steel coils:
The hot dip galvanizing (HDG) technique is used to form a protective layer by immersing the steel strip in a molten zinc bath. Hot-dip galvanized steel coils can be produced by continuous galvanizing lines with oxidation-free annealing furnaces (the Sengiemir method and its variants) or by using wet or dry melting agents (the Cook-Notchman method and its modifications). Hot-rolled or cold-rolled non-annealed (fully hardened) steel coils are used as feedstock for continuous hot dip galvanizing lines equipped with non-oxidation annealing furnaces. The production process consists of electrochemical cleaning, drying and annealing of the strip to obtain the desired mechanical properties, followed by immersion of the material in a molten zinc bath and control of the zinc thickness. The strip is then subjected to forced cooling and finishing (passivation, oiling, leveling, drying and coiling of the galvanized coil). When using lines with wet or dry flux, the raw material (before galvanizing) should have the required mechanical properties, since such lines do not have an annealing furnace. The strip is first degreased with an alkali solution, then pickled in acid, and then coated with a smooth flux layer consisting of a combination of zinc chloride, ammonia chloride and various additives. The strip is then placed in a drawing furnace with a protective atmosphere in which the flux is dried and immersed in a molten zinc bath. The flux thoroughly removes residual pickling substances and moisture from the metal surface, and the film reduces the surface tension of the zinc, ensuring optimal wetting of the metal surface. Hot-dip galvanizing technology is quite common and is widely used in the construction and machine building industries. It is used in large steel mills and re-rollers/coaters.
Electrolytic galvanizing is an electrochemical process in which a layer of zinc is coated in an acidic or alkaline electrolyte bath. The main idea of the technique is to use oxidation and reduction reactions in which electrons move through an electron transport chain while zinc ions in the electrolyte flow from the anode to the cathode. This type of coating is usually used for thin gauge materials; the thickness of the coating is usually 5-12 μm, following precisely the shape of the product. Compared to hot dip galvanizing, electrolytic galvanized layers are more plastic due to the absence of an intermediate brittle layer. The main applications for this type of product include automotive, transportation and mechanical engineering.
Hunter Special Steel Co., Ltd is a comprehensive company for steel process and trading. Its business includes processing, distribution, logistics and import& export of steel. The registered capital of our group is 11 million RMB. Our main products are automobile steel, stainless steel, cold rolled steel, galvanized steel, hot rolled pickled and oiled and tinplate,etc.
We specialize in steel trade with professional team and strict quality control. Cooperating with large steel mills ( Baosteel, Shougang, Angang, Tisco ) At present, our products have been sold to Southeast Asia, Middle East, Africa, South America and other regions which include more than 20 countries.