Hot-rolled coil is a strip steel made of slab (mainly continuous casting slab) heated by heating furnace (or soaking furnace) and rolled by roughing mill and finishing mill. The hot-rolled strip from the hot-rolled coil of the last finishing mill is cooled to the set temperature by laminar flow, and is coiled into a hot-rolled strip by a coiler. Hot rolled coil includes steel strip (coil) and steel plate cut from the steel strip. Steel strip (coil) can be divided into straight hair coil and finishing coil (divided coil, flat coil and longitudinal shear coil).

Classification of hot rolled coils

Hot rolled coil generally includes medium and wide steel strip, thin and wide hot rolled steel strip and hot rolled plate. Medium-thick and wide steel strip is one of the most representative varieties, and its output accounts for about two-thirds of the total output of hot rolled coils. The subject matter of the hot-rolled coil futures contract of Shanghai Futures Exchange belongs to medium plate and wide steel strip.

Hot rolled coil can be divided into ordinary carbon structural steel, low alloy steel and alloy steel according to different materials and properties.

According to its different uses, it can be divided into cold-formed steel, structural steel, automobile structural steel, corrosion-resistant structural steel, mechanical structural steel, steel for welding gas cylinders and pressure vessels, pipeline steel and so on.

Application of hot rolled coil

Hot-rolled coil products have excellent properties such as high strength, good toughness, easy processing and forming, and good weldability, and are widely used in manufacturing industries such as cold-rolled substrates, ships, automobiles, bridges, buildings, machinery, oil pipelines and pressure vessels.