The Zhengwan high-speed rail, Zhengfu high-speed rail, and Shanghe-Hangzhou high-speed rail north section have been opened. Netizens shouted: I finally waited for you, but fortunately I did not give up. So, do you know which steels are made of high-speed rail?
stainless steel
High-speed rail car bodies are mainly made of nickel-chromium austenitic stainless steel. Stainless steel car body has the advantages of high corrosion resistance, beautiful appearance, energy saving and significant economic benefits, etc., and is widely used in car body manufacturing. Because the air tightness of the stainless steel body cannot be solved well, the speed of the stainless steel body must not be higher than 200km / h.
Aluminum alloy
The density of aluminum is only 2.7 (a light metal), which is about 1/3 of that of steel. Because the aluminum surface is easy to oxidize, it forms a dense and dense oxide film with good corrosion resistance and can be used for decoration. Because aluminum has a low melting point and good fluidity, it is easy to manufacture various complex parts. Especially the automotive engine parts are particularly suitable for the use of aluminum alloy materials.
In the 1950s, some developed countries such as the United States, Russia, and Germany have begun to use aluminum profiles to manufacture railway vehicles. At present, aluminum alloy materials have been widely used in domestic high-speed railway cars. Insiders said that high-speed trains with a speed of more than 300km / h must be made of lightweight aluminum alloy, and cars with speeds exceeding 350km / h are made of aluminum except the chassis. At present, there are four types of EMUs: crhi, crh2, crh3 and crh5. Among them, three types of crh2, crh3 and crhi5 are made of aluminum alloy.
High quality carbon steel, low alloy low carbon high strength steel and weathering steel
Because the structure of the high-speed rail bogie is a high-strength component related to the safety of the entire vehicle, it must meet the requirements of vehicle body safety, wear resistance, easy maintenance and running comfort. Therefore, high-quality carbon steel, low-alloy low-carbon high-strength steel, and weathering steel are often used to make bogie frames with their suitable characteristics.
The emergence of the high-speed rail has drawn a heavy stroke for the development of human civilization. Its constituent materials are diverse. Here are just a few of them. Have you found any steel you know on the high-speed rail?
