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COLD-FORMED STEEL

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.

  1. 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.

  1. 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.

(1) Cold-formed steel for automobile manufacturing; small passenger cars, mostly with irregular-shaped open-shaped steel, such as windows, rain gutters, seat machine pulleys. Most of the buses use closed rectangular steel, and most of the freight cars use open-cold steel; special vehicles such as fire trucks, engineering vehicles mostly use rectangular and shaped cold-formed steel. Bosj offerred cold roll forming machine can meets all kinds of industry requirements.

 

(2) Railway vehicles: Most of the passenger cars and freight vehicles use special shaped cold-formed steel, for example, cold-formed middle beams instead of hot-rolled middle beams. Open for a long time.

The middle beams used in the chassis of the car, the caravan, and the tanker are all hot-rolled steel-welded welded structures. They are welded by two hot-rolled sheets of steel with a height of 310. Since the middle beam is welded with a hot-rolled steel, it exists. The utility model has the advantages of large weight, high welding quality requirement (need to be non-destructive testing), and high comprehensive cost. Therefore, the railway department hopes to develop a high-efficiency cold-formed steel with integral shape, lightweight, high strength and good rigidity instead of hot-rolled steel. The cold-formed middle beam developed by WISCO uses hot-rolled coiled sheets as raw materials, and the integral middle beam is obtained by continuous molding. Another example: Qiqi Group developed cold-formed steel for end wall transverse belts and hat-shaped steel side columns in 1985. In 1993, cold-formed steel for upper side beams of rectangular tubes with sharp corners was developed. The material is cold-formed steel 09CuPTiRE-A The yield strength is 295 MPa. The application of cold-formed steel in China’s railway wagons will be more and more.

(3) Elevator: hollow guide rail for the elevator, structural frame for the automatic elevator and cold-formed steel for other special-shaped members

(4) Shelf: Cold-formed steel for small supermarket shelves and large warehouse-style supermarket shelves.

(5) Transmission tower: Focus on the study of replacing the traditional hot-rolled angle steel with cold-formed steel to improve the overall performance of the tower and reduce costs. In the high-voltage long-distance transmission tower, high-strength and anti-corrosion structural steel pipes have been tried in various places. The triangular tower structure made of cold-formed steel for the communication tower is also under development.

(6) Construction machinery: crane lifting arm, support arm, cold-formed steel for tower crane frame.

(7) Electrical equipment manufacturing industry: electrical cabinets, cold-formed steel for cable trays.

(8) Agricultural machinery: cold-formed steel for tractors, plows, hoes, and harvesters, and cold-formed steel for agricultural vehicle beams.

(9) Construction industry: steel structure (beam, column) maintenance structure, roofing, wall, door and window, cold-formed steel for decoration.

  • Furniture: Stools, chairs, cabinets, beds, etc. are special cold-formed steel.

If you want to know the coil forming machine, coil processing machinery and coil rolling machine.As one of the best coil former manufacturers ,we can tell you about coil forming.

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