Urban rail transportation mainly includes metro, light rail, maglev, and tram transportation. Nowadays, more and more cities in China are engaged in the boom of developing urban rail transit. Urban rail transit to speed up the construction, and the demand for stainless steel will increase significantly.

Rail vehicles using stainless steel, in the United States, France, Japan, South Korea, Sweden, and other countries have long begun to develop. The development of stainless steel vehicles in China has been ongoing.It can be said that urban rail transit is currently an important area of stainless steel applications.The use of a high-strength stainless steel body structure can greatly reduce the weight of the vehicle, and enhance the strength of the body structure, stainless steel for the vehicle panels and decorative components can reduce maintenance costs. In addition, stainless steel is also used in the exhaust system of automobiles because of the advantages of resistance to chloride ion corrosion and heat resistance.

Similarly, the application of stainless steel in urban rail transit construction is also a lot, in addition to the vehicle body and internal structure, there are many components in the vehicle, such as the subway vehicle inside the handrail bar, doorway handrail, handrail bar seat, electric heater, and cover plate, stainless steel seats, seat skeleton, hanging ring, air conditioning units, side sliding door guide, etc., all use stainless steel. In addition, several stainless steel applications in urban rail transit construction projects, such as automatic elevators in subway stations, station channel guardrails, seats, billboards, pipes, etc., also used stainless steel.

Urban rail transit construction pulls the demand for stainless steel, and the demand is quite amazing, the stainless steel production enterprises and stainless steel market are undoubtedly a major boon.With the continuous development of new domestic stainless steel,the basic realization of domestic steel for vehicle bodies instead of imports；Meanwhile, the breakthrough in resistance spot welding three-dimensional joint technology，make the production and use of stainless steel for vehicle bodies gradually matured and began to enter a period of rapid development.At the same time, stainless steel car manufacturing companies also put forward new and higher requirements for the quality of stainless steel,For example, the exterior wall panel surface of vehicle body quality of stainless steel materials such as gloss, color difference, and plate shape is required to be nearly perfect,Domestic stainless steel and foreign still have some differences,And China's stainless steel vehicle research and development started late,The degree of localization of stainless steel materials for vehicles still needs to be improved.