What Kind Of Steel Is Cold Rolled?

Cold-rolled steel sheets can be of various types depending on their characteristics and properties. They have four quality classes. The classification of this type of metal is carried out by the ability to extracting, rolling accuracy, the nature of the surface and edges, thickness, and strength. Accuracy of rolled products can be increased, high and normal. The flatness of steel is divided into: especially high, high, improved, normal. Cold-rolled sheets are also classified according to the quality of the surface: best bright finish (I), high finish (II), and increased finish (III).

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Along with the requirements for mechanical properties of cold-rolled steel, a number of requirements that determine its technological suitability are imposed. The microstructure of the sheet metal determines the ductility, ceteris paribus, very decapitated sheet steel is produced with a thickness of 0.25-2.0 mm and is supplied in sheets of 510×710, 600×2000, 710×1420, 710×2000, 750×1500, 1000×2000 and 1250×2500 mm, as a rule in the annealed condition. Sheet steel with a thickness of 0.25-2.0 mm is also supplied galvanized.

Transformer cold-rolled steel sheet is manufactured with a thickness of 0.28–0.5 mm and a width of 750–1000 mm. An important requirement for transformer steel is the amount of watt loss, the value of magnetic induction. For dynamo steel, along with other requirements for electrical properties, the anisotropy of the metal, and the ability to withstand a certain number of bends are important.

With the cold rolling a sheet made of alloyed, structural steel, structural alloyed extra-fine steel for special purposes, corrosion-resistant and heat-resistant, low-carbon electrical, siliceous electrical steels, tin, is produced; as well as cold-rolled tape (e.g., grain-oriented), electrical to magnetic cores, tool, spring and etc.

A characteristic feature of the development of sheet-rolling production is the continuous increase in the share of cold-rolled sheet steel in the total output of sheet steel. This is explained not only by the fact that it is more cost-effective to produce a sheet with a thickness of less than 1-1.2 mm by cold rolling, but also by the fact that the properties and quality of a cold-rolled sheet are much higher than that of hot-rolled.

The chemical composition of steel determines its chemical properties and, to a certain extent, its purpose. So, for cold forming complex products use low carbon steel containing up to 0.08% C. Low carbon content contributes to the deep drawing of steel.

A number of factors affect the dimensional accuracy of the obtained cold-rolled sheets: the rigidity of the cage, the operation of the automatic thickness control system, dimensional stability and the profile of the roll, etc. When assessing the accuracy of rolling cold-rolled and hot-rolled sheets, the longitudinal and transverse thickness variations are distinguished. The latter is closely related to the profile of cold-rolled sheets – waviness and warping. The rigidity of the stand has a great influence on the accuracy of cold-rolled sheets. The rigidity of the cage is characterized by force, which causes an increase in the gap between the rolls by 1 mm due to the elastic deformation of all elements of the working cage.