The opening of the Hong Kong section of the Guangzhou- Shenzhen- Hongkong high-speed railway marks Hong Kong entry into the country's high-speed rail network, ushering in a new era of high-speed rail.
As the saying goes: to get rich, build roads first. The construction of traffic network is essential for the development of a city. With the rapid development of national economy in recent years, the construction of domestic high-speed railway has gradually accelerated the process. Along with the continuous improvement of high-speed railway technology in China, cities along the high-speed railway have also got great development opportunities. Numerous large, medium and small cities are connected by high-speed rail, and the flow between cities and regions is more convenient and efficient. The high-speed rail network is changing the pattern of Chinese cities at an unprecedented speed, and cities are rising with the help of high-speed rail.
The development of rail transit industry directly drives the market demand of relevant materials. Industrial aluminum profile is an important part of high-speed rail industry, and aluminum profile is an excellent material for realizing the lightweight of high-speed rail. As early as in the 1950s, some of developed countries in the world began to use aluminum profiles to manufacture railway vehicles, including the United States, Canada, Japan, Russia, Germany and France, and other countries. At present, aluminum alloy materials have been widely used in domestic high-speed train carriages.
Aluminum profiles for rail vehicles
The density of aluminum alloy is about one third that of steel, and the alloy formed by adding certain elements has higher strength than steel alloy. Therefore, the strength and rigidity meet the safety requirements of high-speed train, the use of aluminum alloy can greatly reduce the self-weight of high-speed train. The surface of aluminum anodized to form a compact and stable oxidation film, so the corrosion resistance is good. Aluminum has good foundry, due to its low melting temperature, good fluidity, easy to manufacture a variety of complex shape parts. The aluminum alloy still maintains the light weight characteristic, but the mechanical performance obviously enhanced.
Whether it is high-speed or subway train, the main material is aluminum alloy. It is understood that the high-speed train body with a speed over 300 km/h, must use lightweight aluminum alloy materials. Over 350 km/h, the train carriage in addition to the chassis all use of aluminum profiles. At present, the magnetic levitation train and high-speed train with speeds exceeding 200 km/h have all been aluminum, and the aluminum rate of other rail vehicle compartments has also exceeded 40 percent. Among the aluminum used, extrusion aluminum is the main material, accounting for about 76% of the total aluminum consumption, and about 24% of the board, foil, pipe and tape. In addition to the manufacturing of rail vehicles need to apply large profile, also include some sheet, foil, pipes, forgings, and doors and Windows, luggage racks, decorative pieces, storage cabinets, carts and other small profile.
Generally speaking, the aluminum alloy used in a high-speed railway carriage is about 10 tons, and the weight of the whole body is 30% to 50% less than that of all steel. It has been shown that a 10% reduction in vehicle weight results in an 8% reduction in fuel consumption. In the scrap recycling, aluminum products can achieve 100% recovery, recycling aluminum profile recycling can reduce 95% of energy consumption.
Policy Orientation
According to China's 13th five-year plan. By 2020, China will have 140,000 km to 150,000 km of railways in operation, including 50,000 km to 60,000 km of high-speed railways to be completed. It is estimated that the total length of high-speed railways completed during the 13th five-year plan period will reach 33,000 km, which is 1.0625 times more than the 16,000 km at the end of the 12th five-year plan period and the framework of the high-speed railway network has been basically completed. At the same time, The country also lowered the minimum number of people applying for subway construction in major cities from 3 million to 1.5 million, which will increase the number of cities that can build subway from 30 to 90. According to experts, the compound annual growth rate of aluminum used in rail transit equipment manufacturing should be above 22% from now to 2030.
High-speed rail has become an important means of transportation for People's Daily travel.
The high-speed rail industry represents the level of a country's high-end manufacturing industry, and transportation aluminum profiles has made an important contribution to the development of China's high-speed rail. The output of high-speed railway means that the output of the whole industrial chain, including engineering construction, equipment manufacturing, rolling stock, follow-up maintenance and other industries, all will be greatly improved.