Flat steel, also known as flat steel, flat steel, flat steel, flat steel, etc., is a section steel with a rectangular section and accurately specified thickness. It is made of ordinary carbon structural steel or low alloy steel strip by cold rolling or cold rolling, or from hot rolled steel coil directly. The flat steel thickness is generally between less than 4mm and 8mm. Flat steel can be divided into cold rolled flat steel and hot rolled flat steel according to the product form.
Cold rolled flat steel is after cold rolling, cold drawing, annealing, leveling, brushing and other fine processing of hot-rolled coil as raw material production of steel plate, which thickness is generally less than 4mm, cold rolled plates can be used for deep processing, such as stamping, welding, cutting and other processing and manufacturing various shapes of products. Cold rolled flat steel can usually achieve better mechanical properties than hot rolled flat steel.
Hot rolled flat steel is the width of 12-300mm, the thickness of 4-60mm shallow internal volume of steel, hot rolling and normalizing on the basis of the short. Hot rolling is made of semi-finished products after heating furnace in rolling mill. The surface quality, dimension, shape and tolerances of hot-rolled products are better than those of cold-rolled products. The hot rolled flat steel usually has a thicker thickness, but the surface quality is relatively poor, which needs to be covered with a surface treatment technique, but it has excellent performance in plasticity, toughness, ductility and welding of molten iron.
Flat steel is widely used in mechanical, metallurgy, chemical, electrical, boiler, shipbuilding, automobile manufacturing and other industries. With the development of high-strength steel, the demand for flat steel has been increasing. To meet the rapid development of global industry, the production, research and development of flat steel has become an urgent task.
At present, the production of flat steel has characteristics of high energy consumption, high environment pollution and high cost. Developing and using high-efficiency, energy-saving and environmental protection technologies and equipment as soon as possible has become one of the trends of development in the manufacturing industry of flat steel. In the future, it is necessary to develop technologies and equipments to satisfy the new demands of the industry and society, improve the production technology and process level of flat steel, reduce the energy consumption and emission.
