Refers to a finished steel product of various cross-sectional shapes bent by a steel plate or strip in a cold state. Cold-formed steel is an economical thin-section thin-walled steel, also known as steel-refrigerated curved or cold-formed profiles.
Cold-formed steel is the main material for making lightweight steel structures. It has a variety of extremely thin, well-shaped and complex sections that cannot be produced by hot rolling. Compared with hot-rolled steel, the radius of gyration can be increased by 50-60% and the moment of inertia of the section can be increased by 0.5-3.0 times in the same cross-sectional area, so that the material strength can be used reasonably; That is to say, the steel structure made of the traditional I-beam, channel steel, angle steel and steel plate can save about 30 to 50% of the steel. In some cases, the amount of steel used for a cold-formed steel structure is equivalent to that of a reinforced concrete structure under the same conditions, and is an economical section steel.
Cold-formed steel is generally made of carbon structural steel and low-alloy structural steel, as well as atmospheric corrosion resistant steel and stainless steel. Cold-formed steel is divided into open steel, semi-closed steel and closed steel. The types used in building structures are angle steel, channel steel, hat steel, Z-shaped steel and other special steels.
Cold-formed section steel is made of hot-rolled or cold-rolled strip by bending. Cold-formed steel has the following characteristics:
1. The section is economical and reasonable, and material is saved. The cross-section shape of cold-formed section steel can be designed according to the need, and the structure is reasonable. The cross-section coefficient per unit weight is higher than that of hot-rolled section steel. Under the same load, the weight of the component can be reduced and the material can be saved. The cold-formed section steel can save 38-50% of the metal in building structure and 15-60% of the metal in agricultural machinery and vehicles compared with hot-rolled section steel. It is convenient for construction and reduces the comprehensive cost.
2. Various kinds of profiles and cold-formed profiles of various materials with uniform wall thickness and complex cross-section can be produced by common hot rolling method.
3. The surface of the product is clean, the appearance is good, the size is accurate, and the length can also be adjusted flexibly according to the need, all of them are supplied according to fixed or multiple rulers, so as to improve the utilization rate of materials.
4. Production can also be combined with punching and other processes to meet different needs.