GalvaNized Steel Coil

Galvanized steel coil are cold-rolled and hot-rolled coils that have been coated with zinc to help protect the steel from atmospheric corrosion. GI coils are successfully used in various industries that have strict requirements for corrosion resistance, durability, strength and appearance. GI can be formed or coated with various coatings, becoming a new hot-selling product. Such as: galvanized corrugated sheet, color-coated galvanized coil (PPGI), etc. The main standards to be followed in the production of galvanized coils include: EN 10346 (Europe), ASTM A653 / A653M (USA), DSTU EN 10346 (Ukraine), GOST 14918−80 (Russia and CIS) and GOST R 52246−04 (Russia). Each manufacturer also has its own original standards.

In previous steelmaking processes, the surface of galvanized steel coils often contained large, flower-like patterns of zinc crystals called “flakes.” Flakes resembled large, hexagonal snowflakes. While today’s galvanized steel still contains flakes, modern steel mills produce galvanized steel with flakes that are almost unnoticeable to the naked eye. This is known as minimal flake and zero flake galvanized steel.

There are two widely used methods for applying zinc to steel coils:

Hot dip galvanizing (HDG) technology involves immersing the steel strip in a bath of molten zinc to form a protective coating. Hot dip galvanized steel coils can be produced by continuous galvanizing lines with non-oxidizing annealing furnaces (Sendzimir process and its variants) or using wet or dry fluxes (Cook-Norteman process and its variants). Continuous hot dip galvanizing lines with non-oxidizing annealing furnaces start with hot or cold rolled unannealed (hardened) steel coils. Hot dip galvanizing technology is quite common and is widely used in construction, machine building and other industries. Large steel mills and re-rolling/coating plants use this technology.

Electrolytic galvanizing (Electrogalvanization) is an electrochemical process in which a layer of zinc is applied in an acidic or alkaline electrolyte. The main idea of ​​the technology is to use 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. Such coatings are usually suitable for thin gauge materials; the coating thickness is usually 5-12 microns and can be precisely adapted to the product shape.

Compared with hot-dip galvanized coatings, electrolytic zinc coatings are more plastic due to the absence of an intermediate brittle layer. The main application areas of such products include automotive, transportation and machinery manufacturing, among others.

Construction industry: manufacturing low-rise building structures, light steel thin-walled structures, sandwich panels, thermal pipe linings and various insulation materials, air conditioning systems, metal roof tiles, profiled panels, culvert pipes, door cladding, elevators, PVC windows and plastic door reinforcement profiles, gypsum board European fasteners, etc.

Automotive industry: manufacturing internal and external body parts of automobiles, repairing external body parts of public transportation vehicles (such as buses and trams).

Machinery manufacturing, instrumentation industry: manufacturing electromechanical equipment, household appliances, instrument and equipment housings, packaging, etc.

Household items: tableware, bowls, buckets, cans, bathtubs, etc.

Color-coated (and other types of coatings) rolled steel production

First with plastic package, then use waterproof paper, finally packed in iron sheet or according to customer’s special request.

Wanzhi Steel is one of the leading suppliers of galvanized steel coils in China. We have a factory in Boxing County, Shandong Province. At the same time, we are an experienced trading company, serving customers from more than 100 countries, such as Turkey, Poland, Chile, Turkmenistan, Brazil, Ukraine, Philippines, etc. In addition, we have a wide range of steel products to choose from. For example, we also offer galvanized corrugated roofing panels, color-coated galvanized steel, and other finished products. We also provide other value-added services such as profile processing, shearing, cutting, etc. Please contact us for more information!