Cold-formed steel is an economical cross-section light-weight thin-walled steel, also known as steel cold-formed section or a cold-formed section. Cold-formed steel is the main material for making light steel structures. It has a variety of ultra-thin, reasonable, and complex cross-sections that cannot be produced by hot rolling. Compared with hot-rolled section steel, in the case of the same cross-sectional area, the radius of gyration can be increased by 50% to 60%, and the section moment of inertia can be increased by 0.5 to 3.0 times, so the material strength can be used more reasonably; compared with ordinary steel structures (that is, steel structures made of traditional I-beams, channel steels, angle steels, and steel plates) can save about 30% to 50% of steel. In some cases, the steel consumption of cold-formed steel structures is equivalent to that of reinforced concrete structures under the same conditions, and it is an economical section of steel.
Cold-formed steel is also widely used and is generally used in production departments such as construction, railway vehicles, automobiles, and ships to make structural parts and auxiliary parts.