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Cold-formed steel refers to a finished steel product of various cross-sectional shapes bent by a steel plate or a 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, compared with the traditional steel structures made of I-beam, channel steel, angle steel, and steel plate, it can save about 30 to 50% of steel.

1. Cold-formed steel is classified according to size specifications and is divided into four types: large, medium, small and wide in terms of product thickness and expansion width.

(1) Large-scale cold-formed steel: the thickness of the product is 6-16mm, and the product has a width of 600-2000mm.

(2) Medium-sized cold-formed steel: the product thickness is 3-6mm, and the product expansion width is 200-600mm.

(3) Small cold-formed steel: the product thickness is 1.5-4mm, and the product expansion width is 30-200mm.

(4) Wide-width cold-formed steel: the thickness of the product is 0.5-4mm, and the product has a width of 700-1600mm.

2. Cold-formed steels are classified according to their shape and can be divided into open and closed.

(1) Universal open-formed cold-formed steel with equilateral and unequal angles, inner and outer bead angles, equilateral and unequal channel steel, inner or outer bead channel, Z-beam, coil Side Z-shaped steel, special shaped open-section steel, etc.

(2) Closed cold-formed steel is a cold-formed steel with a closed section of welded shape, which is round, square, rectangular and shaped according to its shape.

3. Cold-formed steel is classified according to the application.

Different industries have different requirements for cold-formed steel. The production of cold-formed steel can meet the different requirements of various industries and produce various special cold-formed steels. The main items can be listed below.