What is the difference between hot rolled coil and cold rolled coil

Cold-rolled coils use hot-rolled coils as raw materials and are rolled under recrystallization, but are generally understood as rolling using normal-temperature rolled materials. Europe and the United States mostly use 3 to 6 continuous rolling mills as cold rolling equipment, including plates and coils, which can be produced by many steel mills in China, such as Baosteel, Wuhan Iron and Steel, and Anshan Iron and Steel. Among them, those delivered in sheets are called steel plates, also known as box plates or flat plates; those with long lengths and delivered in coils are called steel strips, also known as coil plates.

Hot-rolled coils are made of slabs (mainly continuous casting slabs) as raw materials, which are heated and made into strips by rough rolling mills and finishing mills. 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 plates, flat coils and slit steel strip products. Due to the excellent properties of high strength, good toughness, easy processing and good weldability, hot continuous rolled steel plate products are widely used in ships, automobiles, bridges, construction, machinery, pressure vessels and other manufacturing industries.

With the increasing maturity of hot rolling dimensional accuracy, shape, surface quality and other new control technologies and the continuous advent of new products, hot continuous rolled steel plates and strip products have been more and more widely used and have become more and more powerful in the market. competitiveness.