What Is Cold-Formed Steel?

Cold-formed steel, also known as steel refrigerated curved or cold-formed steel, refers to various sections of various cross-sectional shapes and sizes made by hot-rolling or cold-rolling strip steel as a blank. ^[1]

Cold-formed steel refers to various complex cross-sections made by hot-rolling or cold-rolling strip steel as raw materials under normal temperature conditions. Also known as thin-walled steel, it is a type of light building structural steel. Cold-formed steel has been produced for more than 100 years, and it was originally produced by a single bending press. In 1910, the United States first built the first continuous roll forming unit. After 1960, cold-formed steels developed rapidly. In 1989, the world's annual output reached 8 million tons, with more than 10,000 varieties and specifications. The output of cold-formed steel in various industrial developed countries accounts for about 5% of the total steel output. China completed the first cold-formed steel production unit in Shanghai in 1958. By the end of the 1980s, there were more than 30 forming units, producing nearly 100 varieties and an annual output of more than 200,000 tons of cold-formed steel. ^[2]

Cold-formed steel is hot rolled or

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,

Cold-formed steel is the main material for making light steel structures. It is made of cold-formed 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 can produce various profiles and cold-formed steels of different materials with uniform wall thickness, which is difficult to produce by general hot rolling methods, but complex cross-sectional shapes. 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, which are divided into open, semi-closed and closed according to section. According to the shape, there are cold-formed channel steel, angle steel, Z-shaped steel, square tube, rectangular tube, special-shaped tube, and rolling door. The latest standard 6B / T 6725-2008 adds the classification of the yield strength grade of cold-formed steel products, the addition of fine grain steel, and the specific assessment indicators of the mechanical properties of the product.

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, which 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. 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 square (rectangular) section steel, there are 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. In the field of rectangular (rectangular) steel pipe forming, the technology of directly forming a square or a rectangle is the most advanced forming technology in the world. 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. The process of first rounding and then square or rectangular damages the material of the steel strip or coil. The process of directly forming a square or rectangle 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. ^[3]