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Application field and market prospect analysis of cold bending steel
Cold-formed steel is mainly made of carbon steel, high quality carbon structure steel, low alloy structural steel and stainless steel hot rolling and cold rolled strip as raw materials.
The continuous cold bending steel forming unit mainly includes unwinding, straightening, shearing and welding, storage, forming (welding, shaping), fixed length cutting, checking and collecting and some special procedures. Its equipment is basically similar to the high frequency welded pipe set, but the form of cold bending forming machine is very diverse. According to the specifications of the product, it can be divided into a common cold bending steel forming machine Group, open-ended cold-formed steel forming unit, wide-width wavy steel forming unit, the three types of unit structure and product focus are different. The general cold bending steel unit can produce not only the simple non Welded cold bending copper products, but also the welded closed sections, such as round tube, square moment type and other special-shaped tube.
This product is widely used in light steel structure, automobile manufacturing, highway transportation, logistics equipment, electrical appliance cabinet, etc. Typical products are "C" "Z" type sandalwood; oblique edge coiling Z steel; unequal winding edge Z steel; unequal coiling Z steel; color steel press type plate; "U" channel steel for automobile beam; upper and lower steel; marine fender, small barn; Japanese, European and American highway protection; suspension transmission guide rail and so on. Execute standard GB6723-86, GB6726-86etc.
Chinas cold bending steel production began in 50 to 60s, serving the agricultural machinery industry. By 80s, it was the first high tide of development. It serves automobiles, buses, building windows and doors, transportation, shelves, electrical appliances and so on. So far, more than 1000 sets of production units have been built, and 42 sets of large 200mm units are available and under construction. The maximum diameter is up to 660mm. The national cold-formed steel production capacity reached 15 million tons / year, basically meeting the market demand of 4 million 380 thousand tons / year. The export volume is very small, only a few thousand tons. The cold bending yield accounts for 2.4% of the steel output. The product variety has reached more than 2000. The steel is developed from single plain carbon steel to high strength, weathering and refractory steel. Cold formed steel has become an indispensable rising star in the variety of steel products, and is favored by the majority of users.
The China Iron and Steel Industry Association investigates eight industries with large amounts of steel, which are related to seven aspects of construction, machinery, automobiles, agricultural vehicles, shipbuilding, railway and containers. 9 cold bending steel industry large households have been investigated. The demand for cold bending steel market is 4 million 384 thousand and 500 tons per year, accounting for 2.4% of the steel output. In the later period of fifteen, the steel production is 7 million 326 thousand and 400 tons / year, accounting for 33% of the steel output, and the growth rate is 3 million 42 thousand and 300 tons per year, and the average annual growth rate is above 20%. It can be seen that the cold bending steel has second development climax.
In the market survey, the cold bending steel association of China Steel Association deeply felt that the knowledge of the cold bending steel was greatly improved and the advantages of the cold bending steel were greatly improved, such as the complexity of the section shape, the simple production equipment and technology, the small one-time investment, the quick riding, the organization production spirit, the length, width and thickness; The product has smooth surface and high precision, and the same shape and size of the same section can save metal material 5%. In engineering application, it belongs to the high efficiency economic section steel, generally can save 15 - 30% of metal, although the unit price is higher than the hot rolled section, but the cost of the project is still lower than that of the common material. Its vitality is strong, and is welcomed by all sectors and sectors of the national economy.
Nowadays, in the trend of personalized economy, users are demanding more and more accuracy in shape and size of materials. For example, railway vehicles and road wagons are developed to special vehicles, which account for more than 60% of foreign countries. The diversification of the product will inevitably lead to the diversification of the material. And cold bending steel itself is mainly special material, not general material, big goods, many varieties, production lot size is not large, the most suitable for personalized customer demand. Therefore, in recent years, all sectors of the national economy are willing to cooperate with the cold-formed steel industry to continuously develop new materials and new products. It is an irresistible trend that the large market of hot rolled steel has been replaced by cold-formed steel gradually.
Good prospects for cold bending steel market in China
In recent years, the demand for cold-formed steel market in China has been increasing, and its application scope is expanding. At present, it is urgent to develop cold bending steel of stainless steel, galvanized sheet, high strength and ultra-high strength low alloy material, and super - thick, super thin section cold bending steel products.
Cold-formed steel is a kind of special-shaped steel with important advantages of light weight and high strength. It is a new material with high efficiency and economy which is widely used in our country. Since the reform and opening up, with the acceleration of Chinas economic construction, the cold-formed steel has been gradually accepted by the market. At present, there are hundreds of enterprises producing cold bending steel in China, with annual production capacity of about 2 million tons, of which there are only 5 large and medium-sized state-owned backbone enterprises, with annual output of about 30-40 million tons. The output of cold-formed steel made in China accounts for only 1.2% of the total steel products. Compared with the proportion of 5% in developed countries, the development potential is great.
At present, the main types of cold bending steel in China are: Cold Bending Rectangular Tube for structure, cold bending steel for bus, rolling curtain door and steel window type steel, low pressure fluid conveying welding pipe, general opening cold bending steel, cold bending steel structure for construction steel structure, cold bending profile of various sections, and already in construction, machinery, nuclear power and automobile Railway, agricultural machinery, chemical industry, petroleum, refrigeration, food and textile.
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