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General Information on coils

In the case of steel strip wound into coils, a distinction is made between hot-rolled or cold-rolled strip and hot-rolled or cold-rolled wide strip. The former has a width of up to 600mm, whereas a width of more than 600m is referred to as wide strip.

Steel sheets cut from the coils benefit from the versatile material properties. Properties such as wear resistance have a positive effect on the longevity of the product. This in turn favors the cost-effectiveness of coils.

Production of coils

In order to produce coils, a steel strip must first be produced. Hot rolling is the first step. The rolling process reduces previously heated slabs to the desired thickness. The entire length of the strip is then wound directly into a roll.

In the next step, the scale produced during hot rolling can be removed. For example, the strip can be pickled. Here the steel strip is immersed in baths with hydrochloric or sulphuric acid. The last residues of the acid on the strip are neutralized with a base. This step is important because the acid would later lead to corrosion.

After removing the scale, the coils can also be cold-rolled. The strip is further rolled at room temperature until the desired dimension is reached again. Cold rolling is used above all when higher dimensional accuracy and a smoother surface are required. In addition, the strength of the material also increases, which represents a further advantage for the product.

It is also possible to machine the surface of coils. A popular method for this is coil coating, also known as coil coating. Here, the steel strip is continuously coated with a plastic film or lacquer. The popularity of this process results above all from the resource-saving use of materials and the high efficiency.

Where are coils used?

Due to the numerous positive properties of steel, the coiled steel strip can be used in various areas:

  • Automotive
  • Mechanical engineering
  • Tool construction
  • Construction