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.product category:1. Hot rolls can be divided into straight hair rolls and finishing rolls (split rolls, flat rolls and slit rolls).2. According to its material and performance, it can be divided into: ordinary carbon structural steel, low alloy steel, alloy steel.3. According to the different uses, it can be divided into: cold forming steel, structural steel, automobile structural steel, corrosion-resistant structural steel, mechanical structural steel, welded gas cylinder and pressure vessel steel, pipeline steel, etc