Cold-formed steel is a kind of high-efficiency and economical steel that can be deformed more. The main advantage is to save materials. According to foreign data, cold-formed steel can save 30% to 50% of materials compared with hot-rolled steel.
① Because the production process of cold-formed steel is different from that of hot-rolled steel, it can produce thinner and wider steel. From the perspective of section characteristics, steel is used where it is more necessary. For example, a 20-gauge light steel channel steel has a web thickness of 5.2mm and a flange thickness of 9mm, while the cold-formed channel steel can produce cold-formed channel steel with a thickness of 3mm, and can also be reduced to less than 2mm, so the cold-formed steel can produce more Thin section steel, like No. 20 light channel steel, has a flange width of 76~80mm, while cold-formed channel steel can be larger than 80mm and can reach or exceed 200mm, so cold-formed steel can produce wider section steel. Cold-formed steel can increase inner and outer curling, while hot-rolled steel cannot produce inner curling. The crimping acts to stabilize the section and increase the bending and torsional resistance. Round, square, rectangular and other hollow section steels are more difficult to produce by hot rolling, but can be produced by cold bending. Rolled steel window section steel, L-shaped purlin section steel, steel door frame and steel door, etc.
② Cold-formed steel is cold-formed, and the yield strength of the steel is increased during the cold-working deformation process. After testing, it can generally be increased by 10% to 15% in square and rectangular tubes, and some can be increased by 20%. It should be fully utilized in structural design. There are many examples of using cold working to improve yield strength in the construction field. For example, purlins are tensioned. After use, not only the length increases, but also the stress increases. Cold-drawn low-carbon steel wire, cold-rolled reinforced steel bar, and cold-rolled twisted steel bar all use cold working to increase the yield strength and increase the allowable stress of the design. However, the shape and size of cold-formed steel change, and the degree of yield strength improvement is not the same. This factor is used in the American light steel design code.
③ Cold-formed steel can produce many profiles with surface protective layers, such as galvanized, galvanized, tin-plated, plastic-coated and other materials to solve the problem of rust prevention. Color-coated steel sheets rolled into corrugated steel sheets are used for roofs and walls ideal material. The color plates produced by Baosteel with galvanized plate as the substrate and then coated with resin material can guarantee a 20-year life. Australian BHP company uses aluminum-zinc alloy coated plate as the substrate color plate to ensure a longer life. Steel companies such as Panzhihua Iron and Steel Co., Ltd. and Baosteel Iron and Steel Co., Ltd. have also successfully developed color plates plated with aluminum-zinc alloys.
④ Cold-formed steel can be connected with various deep processing processes, such as punching, welding, painting, etc., to create conditions for the factory production of parts. The special unit for purlin conditions manufactured by Hans Factory in New Zealand can produce channel steel, inner curling channel steel (C-shaped steel), Z-shaped steel, and curled Z-shaped steel. With punching equipment, cutting equipment, direct production of parts.
⑤ The macroscopic comprehensive economic benefit of cold-formed steel is proportional.