Hot rolled, that is, hot rolled coil, which is made of slab (mainly continuous casting billet) as raw material, and is made into strip steel by rough rolling mill and finishing mill after heating.

The hot steel strip coming out of the last rolling mill of finishing rolling is cooled to the set temperature by laminar flow, and then rolled into a steel strip coil by the coiler. The cooled steel strip coil undergoes different finishing operations according to the different needs of users. Lines (leveling, straightening, cross-cutting or slitting, inspection, weighing, packaging and marking, etc.) are processed into steel sheets, flat coils and slit steel strip products.

Patterned coil, also known as patterned steel plate, is also called reticulated steel plate, which is a steel plate with diamond or ridges on its surface.