There are many types of cold-formed steel. According to the cross-sectional shape, there are open, semi-closed and closed. The main products are cold-formed channel steel, angle steel, Z-shaped steel, cold-formed corrugated steel plate, square tube, rectangular tube, welded special-shaped steel tube, and rolling door Wait. Generally produced cold-formed steel has a thickness of less than 6mm and a width of less than 500mm. Commonly used specifications in China are equilateral angle steel (limb length 25 to 75 mm), inner curled angle steel (limb length 40 to 75 mm), channel steel (height 25 to 250 mm), inner curled channel steel (height 60 to 250 mm) ), Crimped Z-shaped steel (100-180 mm high) and more than 400 specifications and varieties. Products are widely used in mining, construction, agricultural machinery, transportation, bridges, petrochemicals, light industry, electronics and other industries.
Cold-formed steel is the main material for making light steel structures. It is made by cold-forming of steel plate or steel strip. Its wall thickness can not only be made very thin, but also greatly simplify the production process and improve production efficiency. It is possible to produce various profiles and cold-formed steels of different materials with uniform wall thickness but complex cross-section shapes, which are difficult to produce by ordinary hot rolling methods. In addition to being used in various building structures, cold-formed steel is also widely used in vehicle manufacturing and agricultural machinery manufacturing. There are many types of cold-formed steel, divided according to the cross-section, semi-closed and closed. According to the shape, there are cold-formed channel steel, angle steel, Z-shaped steel, square tube, rectangular tube, special-shaped tube, roller shutter door and so on. According to GB6725-92, cold-formed steel is made of common carbon structural steel, high-quality carbon structural steel, low-alloy structural steel plate or steel strip. Cold-formed steel is an economical section steel, and it is also a highly efficient and energy-saving material. It is a new type of steel with strong vitality. It is widely used in various areas of the national economy. 10 categories are containers, steel formwork and scaffolding, railway vehicles, ships and bridges, steel sheet piles, transmission towers, etc.
冷 In the production of cold-formed hollow rectangular steel, there are currently two different production forming processes. One is to make a circle and then change to a square or rectangle; the other is to make a square or rectangle directly. At present, in the field of rectangular steel tube forming, the most advanced forming technology in the world is directly formed into square and moment. The process of directly forming a square or a rectangle is more advanced than the process of forming a circle and then deforming a square or a rectangle. Rounding first and then square or rectangular process will damage the material of steel strip or coil. The process of directly forming square and moment will not cause damage to the material during the forming process and can maintain the mechanical properties of the raw materials. And physical properties to ensure the excellent product. It is understood that a large steel pipe factory in Tai'an, Shandong Province, uses direct forming and moment forming technology, and the forming effect is very good.
In recent years, the market demand for cold-formed steel in our country has been increasing day by day, the application range has been continuously expanded, and the market prospect is very broad. At present, there is an urgent need to develop stainless steel, galvanized sheet, high-strength and ultra-high-strength low-alloy cold-formed steel, and ultra-thick and ultra-thin series of difficult-to-complicate cold-formed steel products.