There are many varieties of cold-formed steel, which are divided into cross-sectional shapes, 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. The cold-formed steel that is usually produced has a thickness of 6 mm or less and a width of 500 mm or less. Commonly used in China are equilateral angle steel (length of limbs 25 to 75 mm), inner rolled angle steel (length of limbs 40 to 75 mm), channel steel (25 to 250 mm high), and inner crimping channel steel (60 to 250 mm high) ), more than 400 specifications and varieties of rolled Z-shaped steel (100-180 mm high). Products are widely used in mining, construction, agricultural machinery, transportation, bridges, petrochemical, light industry, electronics and other industries. Puri steel cold-formed steel is the main material for making light steel structure, and it is made by cold bending of steel plate or steel strip. Its wall thickness can be made not only very thin, but also greatly simplifies the production process and improves production efficiency. It is possible to produce various types of profiles and different materials of cold-formed steel which are difficult to produce by general hot rolling methods and have a uniform wall thickness but a complicated cross-sectional shape. 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 varieties of cold-formed steel, which are divided into sections according to the section, semi-closed and closed. According to the shape, there are cold-formed channel steel, angle steel, Z-shaped steel, square tube, rectangular tube, shaped tube, rolling door and so on. According to the provisions of GB6725-92, cold-formed steel is made of ordinary 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 an energy-efficient material. It is a new type of steel with strong vitality. It is widely used in various fields of the national economy. Its use can be roughly divided into highway guardrails, steel structures, automobiles, Containers, steel formwork and scaffolding, railway vehicles, ships and bridges, steel sheet piles, transmission towers, and other 10 categories. In the production of cold-formed hollow rectangular steel, there are currently two different production forming processes. One is to round and then square or rectangular; the other is directly square or rectangular. At present, in the field of square rectangular steel tube forming, the technology is the most advanced molding technology of direct and square technology. The process of directly forming a square or a rectangle is more advanced than the process of forming a circle or a square or a rectangle. The method of forming a circle and then changing the square or the rectangle is more damaging to the steel strip or the coil material; and the process of directly forming the square and forming the moment, the material is not damaged in the molding process, and the mechanical properties of the raw material can be well maintained. And physical properties ensure the excellent product. It is understood that a large-scale steel pipe factory in Tai'an, Shandong Province, uses direct square and momentary technology, and the forming effect is very good. In recent years, the demand for cold-formed steel in China has been increasing, the scope of application has been expanding, and the market prospect is very broad. 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, ultra-thin series of difficult and complex section cold-formed steel products.
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