Sheet metal is a metal that is shaped into thin, flat pieces by hot and cold rolling industrial process. Sheet metal is one of the basic forms of metalworking and can be cut and bent into various shapes.
Sheet metal is made by running hot slabs of metal through a series of roughing rolling stands that makes them thinner and longer. To make them even thinner, these sheets go through finishing rolling stands and are then cooled and rolled into coils.
Pickling is a surface treatment method used to remove impurities such as stains, inorganic contaminants, rust or scale from the surface of the metal after manufacturing by using an acid bath.
Aluminium forms a protective layer of oxide when exposed to atmospheric air that protects aluminium from further rusting and oxidisation. However, steel can rust after going through pickling. To protect steel from rusting, a thin film of oil is usually used to protect the steel, and hence the term ‘pickled and oiled steel’.
Sheet metal coils after hot rolling and pickling can be used as what is known as a hot band. If special finishing is needed, further processing is done starting with cold rolling to make the sheets even thinner. After that, the sheet metal coils can go through other finishing processes.