what is cold rolled steel coil?

The cold rolled steel coil is a type of cold rolled steel.It is different from the hot rolled steel coil.It
refers to the steel strip which is directly rolled into a certain
thickness by a roller and rolled into a whole roll by a winder at room
temperature.

The cold rolled steel coils are
manufactured from the hot rolled steel coils. The hot rolled coils are
cleaned chemically and processed further in cold reduction mills, where
the material is cooled (at room temperature) followed by annealing
and/or tempers rolling. This process will produce steel with closer
dimensional tolerances and a wider range of surface finishes.The
thickness of the cold rolled plate is generally between 0.1--8.0mm, the
thickness of the cold rolled plate produced by most factories is less
than 4.5mm, the thickness and width of the cold rolled plate is
determined according to the equipment capacity and market demand of each
factory.

Cold rolling is to further roll the steel sheet to the target thickness at room
temperature and below the recrystallization temperature.Compared with
hot rolled steel plate, cold rolled steel plate thickness is more
accurate, and the surface is smooth and beautiful. Cold rolling
increases strength, enhances the surface finish and offers uniform
thickness. To prevent thecold rolled steel coilsfrom rust, they are
usually coated with thin layer of oil. Further coating of Zinc-Aluminium
alloy or galvanization on the metal can be processed. Tianjin
Tianzhongzhongzhi offer cold rolled coils in a range of international
standard grades.