Flat steel products are made from Slabs, rolled and mechanized in different processes to achieve the desired final shape.
Hot Rolled Steel Coils, physician Sheets and Strips
Hot rolled coils are produced from slabs that are re-rolled at above re-crystallization temperature to produce a thinner sheet (between 1 and 20 mm). This long steel sheet can be bound in coil form, cut-to-length or slit into narrower strips to give it the desired shape.
Tube makers bend and weld the steel coil, sheet or strip to produce tubes for a variety of applications. Hot rolled products are also feedstock for upstream processing into higher value industrial products. They can be modified at cold rolling mills or by applying different coatings.
Cold Rolled Steel Coils, Sheets and Strips
Cold rolled coils are produced from re-rolling hot rolled coils under heat lower than re-crystallization temperature into thicknesses down to 0.2mm. This process improves the strength of the steel up to 20%. It also improves the surface finish and permits a tighter control of tolerances. Common uses are tube and pipe making, white goods manufacturing, cutting to length and further processing by galvanizing and coating into higher value products. Higher grades of cold rolled coils are used for automotive applications.