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Steel Coil Definition And Classification

May. 26, 2021

Coil - a finished steel product, such as sheet or strip, that has been rolled and then coiled or wound. Based on the experience gained over the years, steel coils are classified into cold rolled steel coils and hot rolled steel coils, or stainless steel coils, carbon coils and galvanized steel according to current products and international standards. Next, the steel coil supplier will share the following content with you.


Hot rolled steel coils

Hot rolled steel coils are made from semi-finished products that are rolled, annealed and reduced to a certain thickness and rolled into coils. Hot rolled steel is used to manufacture pipes, steel doors and tanks or further processed into cold rolled steel.


Hot-dip galvanized steel coils are available with a pure zinc coating through the hot-dip galvanizing process. It offers the economy, strength and formability of steel combined with the corrosion resistance of zinc. The hot-dip process is the process by which steel gets coated in layers of zinc to protect against rust. It's especally useful for countless outdoor and industrial applications.


They are mainly used in building roof, door, window, roller shutter doorand automobile's vehicle shell, chassis, door, trunk lid, Oil tank, and fender, and also electric equipments, such as refrigerator base and shell and so on.

Cold Rolled Steel Coils

 Cold Rolled Steel Coils

Cold rolled steel coils

Cold rolled steel coils are made by "pickling" the hot rolled plate in a weak acid solution to remove rust, then cleaning, brushing, drying, oiling, uncoiling, and finally cold rolling through the plate. It is then passed under pressure through a size reduction machine and wound into coils. 

Cold rolled steel is a higher finished product with a smoother surface, higher dimensional accuracy (thickness, width, length) and higher strength. Many cold-rolled steels are used in the automotive industry, but some are also used in the manufacture of household items.

The raw material of cold rolled steel coil is high quality hot rolled product, and after pickling continuous rolling, degreasing, annealing, skin pass, slitting and cut to length line etc.


Stainless steel differs from carbon steel in its chromium and, in some cases, nickel content. The addition of chromium to carbon steel makes it more resistant to rust and staining, and when nickel is added to chromium stainless steel, it enhances its mechanical properties, such as density, heat capacity and strength. For example, stainless steel sheets are used in the manufacture of machinery, tools and containers.


Carbon coil

Carbon coil, a type of steel that generally has only a small quantity of elements other than carbon, silicon, manganese, sulfur and phosphorus, so it has no significant alloying element. Carbon coil is good for second grade applications placing no particular demands on surface quality. ANSON’s carbon coil steel comes in a variety of grades and thicknesses to support the countless applications of this metal.


Galvanized coil

Galvanized coil produced when hot or cold rolled sheet or strip is coated with zinc, either by the hot-dipping or electrolytic deposition processes. Zinc coating applied by the hot dip method is normally heavy enough to resist corrosion without additional protective coating. Materials electronically galvanized are not used for corrosion-resistant applications without subsequent chemical treatment and painting, except in mild corrosive conditions, due to the thin coating of zinc. 

Galvanize is a pure zinc coating. A special heat-treating process converts the pure zinc coating to a zinc/iron alloy coating, and the product is known as Galvanneal. Galvanized sheet is used, e.g. in the automotive industry or in the production of roofing materials (e.g. flashing, guttering).

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