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Many steel coil dealers who are the first time to do steel coil business do not know much about steel coil. So, I would like to summarize some knowledge of steel coil here. Some questions like - what is steel coil? What fields are coil steel used in? How to polish the steel coil plate? How is the steel coil loaded and unloaded? These will be helpful for distributors to custom high quality best price China manufacturer steel coil.


1. What is a steel coil?

Steel coil is also called coil steel. Using slab (mainly continuous casting slab) as raw material, after heating, it is made into strip steel by rough rolling mill and finishing mill. The hot strip from the final finishing mill is cooled to a set temperature by laminar flow, and is rolled into coils by the mill. The cooled steel coils are processed into steel sheets, flat coils and slitting steel strip products through different casting and rolling lines according to the different needs of users. Usually, customers can customize their steel coils.

steel coil produce.jpg

2. Classification of steel coils

The forming coils of steel coils are mainly hot-rolled coils and cold-rolled coils.

a. What is hot-rolled coils?

Hot rolling uses slabs (mainly continuous casting slabs) as raw materials, and after heating, strips are made by rough rolling mills and finishing mills. The hot steel strip coming out of the last rolling mill of finishing rolling is cooled to the set temperature by laminar flow, and is rolled into a steel strip coil by the coiler. The cooled steel strip coil undergoes different finishing operations according to the different needs of users. Lines (leveling, straightening, cross-cutting or slitting, inspection, weighing, packaging and marking, etc.) are processed into steel plates, flat coils and slit steel strip products.

Classification of hot-rolled coils

(1). Classification of hot-rolled coils according to thickness.

Hot rolled coils generally include medium and thick wide steel strips, hot rolled thin wide steel strips and hot rolled sheets.

Medium-thick and wide strip is the most representative variety, and its output accounts for about two-thirds of the total output of hot-rolled coil.

The medium-thick wide steel strip refers to the steel strip with a thickness of ≥3 mm and less than 20 mm and a width of ≥600 mm, which is produced by continuous wide-band hot rolling mills or furnace coiling mills and delivered in coils.

Hot-rolled thin and wide steel strip refers to the steel strip with thickness < 3 mm and width ≥ 600 mm, which is produced by continuous wide-band hot rolling mill or furnace coil rolling mill or thin slab continuous rolling equipment and delivered in coil form. Hot-rolled sheet refers to a single sheet of steel with a thickness of <3 mm.

Hot-rolled sheet is usually produced by equipment such as continuous wide-band steel rolling mill, continuous casting and rolling of thin slab, and delivered in sheet form.

(2). Classification of hot-rolled coils according to materials and properties.

Hot rolled coils can be divided into ordinary carbon structural steel, low alloy steel, and alloy steel according to their different materials and properties.

(3). Classification of hot-rolled coils according to uses.

According to the different uses, it can be divided into cold forming steel, structural steel, automobile structural steel, corrosion-resistant structural steel, mechanical structural steel, welded gas cylinder and pressure vessel steel, pipeline steel, etc.

High quality hot-rolled coil products have excellent properties such as high strength, good toughness, easy processing and good weldability, and are widely used in the manufacture of cold-rolled substrates, ships, automobiles, bridges, construction, machinery, oil pipelines, pressure vessels, etc. industry.

b. What is cold-rolled coils?

Cold rolling is to use hot rolled steel coil as raw material, after pickling to remove oxide scale, cold continuous rolling is carried out, and the finished product is rolled hard coil. Due to the cold work hardening caused by continuous cold deformation, the strength and hardness of the hard-rolled coil increase, and the toughness and plastic index decrease, so the stamping performance will deteriorate, and it can only be used for parts with simple deformation. The hard-rolled coil can be used as the raw material of the hot-dip galvanizing plant, because the hot-dip galvanizing unit is equipped with an annealing line, and the hot-rolled pickling coil is continuously rolled at the normal temperature. Its strength is very high, but its toughness and weldability are slightly poor. The surface is bright and not easy to corrode. In order to prevent rust, the surface is coated with a layer of protective oil when it leaves the factory (hot rolled ones are not). Due to the complex process, the price is higher.

Classification of cold-rolled coils

Cold-rolled steel coils can be divided to: hot-rolled pickling steel coil, hard-rolled steel coil, ordinary cold-rolled steel coil, galvanized (electro-galvanized, anti-fingerprint, hot-dip galvanized) steel coil, galvalume steel coil, electroplated tin coil, color-coated steel coil, electrical steel (silicon steel sheet) coil, etc.

3. What is the use of steel coil?

Because steel coil products have high strength, good toughness, and a wide variety of steel specifications, they are also widely used. They are widely used from general engineering structures to the manufacture of automobiles, bridges, ships, boilers and pressure vessels. Compared with ordinary building boards, quality steel coils have stronger scratch resistance, and are not easy to leave scratches after being scratched by sharp objects. Therefore, they are also often used to make home appliances and rolling shutter doors and windows. In addition, because of their good weather resistance It is flexible and easy to form, and is often used as a substitute for wood.

Different uses have different requirements on the material properties, surface quality, size, and shape accuracy of steel plates. As a professional steel coil supplier in China, we manufacture and sell steel coils for various purposes at best prices and high quality. Welcome customers from all over the world to buy! If you need steel coils with special specifications, you can also contact us to customize them.

4. Chief sale market of steel coil

The general weight of the steel coil is about 15-30T. The sale of steel coils in coils is mainly aimed at large customers. Generally, users do not have uncoiler equipment or have limited consumption. Therefore, the subsequent processing of steel coils will be a promising industry. Of course, the larger steel mills currently have their own decoiling and leveling projects. HDT steel is a steel coil manufacturer and supplier in China. Distributors can get their custom steel coils in high quality with best price.

5. How to polish the steel coil?

a. When polishing the steel coil, mechanical polishing can be used. This method is generally manual, which is to flatten the concave and convex position of the steel coil. In the process, sandpaper and whetstone strips and other props will be used. Mechanical polishing of the plate can improve the surface quality of the steel coil.

b. When polishing the steel coil, chemical polishing can also be used. This polishing method uses a chemical reaction to flatten the raised position of the steel coil. The biggest advantage is that there is no need to use too much in the process. Sophisticated equipment with good polishing effect.

c. Electrolytic polishing can also be used for steel coil polishing. Although the principle is very similar to that of chemical polishing, the polishing effect of electrolytic polishing is better in comparison, because this polishing method uses point solutions. The solution flattens the raised areas on the surface of the steel coil.


steel coil transport.jpg

6. How to load and unload steel coils?

How are the dangerous and heavy goods such as steel coils and steel loaded and unloaded? 

The large cargo such as steel coil is not only heavy and bulky, but also a little turbulent. The collision will cause the rolling of the steel coil. When it is violent, it may also cause the car to crash. movement of goods.

When the steel coil cargo is loaded, it is generally not laid flat for the convenience of unloading, and it will only stand up in a drum style. Because the steel coil weighs several tons, and it is impossible to move by manpower inside the container, it is generally erected for the convenience of unloading. However, the danger is very high. The sudden braking and collision during door-to-door transportation may cause the steel coil to roll due to inertia, causing incalculable damage.

steel coil fix.jpg

When loading steel coils, it needs to be fixed internally, and various ropes are required for protection to prevent the container from rolling or colliding, causing damage to the container.

For steel coils and steel goods, they need to be fixed with various ropes inside to prevent the goods from shaking violently due to waves and swaying during vehicle transportation and ship transportation.

7. HS Code list of steel coils

7208100000

steel   coil

7220204000

steel   coil

7208271000

steel   coil

7210300000

Color   steel coil

7212400000

steel   coil

7210490000

Color   steel coil

7212500000

steel   coil

7210610000

Color   steel coil

7226920000

steel   coil

7210701000

Color   steel coil

7209161000

Coil

7211290000

steel   coil

7210490000

Coil

7211900000

carbon   steel coil

7227100000

Coil

7208360000

carbon   steel coil

7209169000

steel   coil

7228709000

steel   coil

7209189000

steel   coil

6805300000

steel   wool roll




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