Cold-formed steel type and technology

There are many types of cold-formed steels, from cross-sectional shape, with open, semi-closed and closed, the main products are cold-formed channel steel, angle steel, Z-shaped steel, cold-formed steel plate, square tube, rectangular tube, special steel pipe, rolling shutter 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.

China's common specifications are equilateral angles (25 to 75 mm in length), angled steel (40 to 75 mm in length), channel steel (25 to 250 mm in height), and inner channel steel (60 to 250 mm in height). ), more than 400 specifications and varieties such as crimped Z-shaped steel (100 to 180 mm high). Products are widely used in mining, construction, agricultural machinery, transportation, bridges, petrochemicals, light industry, electronics and other industries.

Puri steel cold-formed steel is the main material for the production of lightweight steel structures, and is made of steel sheets or strips formed by cold bending. Its wall thickness can not only be made very thin, but also greatly simplifies the production process and increases production efficiency. It is possible to produce a wide variety of sections and cold-formed steels of different material thicknesses that are difficult to produce with a common hot rolling method but have a uniform wall thickness but a complex cross-sectional shape. In addition to 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 sections, which are divided into sections, which are open, semi-closed and closed. According to the shape of cold-formed channel steel, angle steel, Z-shaped steel, square tube, rectangular tube, shaped tube, shutter doors.

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 made of cold bends. Cold-formed steel is an economical section steel, also a high-efficiency and energy-saving material. It is a new type of steel with powerful vitality. It is widely used in various fields of the national economy. Its use can be divided into highway guardrails, steel structures, automobiles, There are 10 categories of containers, steel formwork and scaffolding, railway vehicles, ships and bridges, steel sheet piles, transmission towers, and others.

In the production of cold-formed, hollow square moment steels, there are currently two different production forming processes. One is first into a circle and then a square or rectangle; the other is a direct square or rectangular shape. At present, in the field of rectangular rectangular steel pipe forming, the most advanced molding technology of the international technology is directly developed into square and rectangular. The direct square or rectangular process is more advanced than the first round or rectangular or rectangular process. The first-round and then-reversible square or rectangular process has great damage to the material of the steel strip or coil; the direct square-forming and moment-forming process does not substantially damage the material during the molding process, and can maintain the mechanical properties of the raw material well. And physical properties ensure the excellent product. It is understood that a large-scale steel pipe plant in Tai'an, Shandong Province, is a technology that uses direct and square torque, and the molding effect is very good.

In recent years, the demand for cold-formed steel market in China has been increasing day by day and the scope of application has been continuously expanding. The market prospect is very broad. There is an urgent need to develop stainless steel, galvanized sheet, cold-formed steels with high strength and ultra-high strength and low alloy materials, and ultra-thin and ultra-thin series of difficult-to-complex section cold-formed steel products.