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SHAFT

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SHAFT refers to the application of railway locomotives and vehicle axles. Axle steel is used to manufacture professional steel for railway locomotives and vehicle axles. The axle force and the performance of the axle steel require that the axle is a key component to withstand the quality of the locomotive and the vehicle. It can withstand many complex stresses such as rotational bending and impact during operation, and fatigue cracking is the main form of failure. Therefore, axle steels are required to have sufficient strength and toughness, and the requirements for various metallurgical defects that can become a source of axle cracks are very strict.
Process flow
The process flow used in SHAFT smelting is: electric furnace steelmaking→LF refining→VOD/VD treatment→casting into ingots. The capacity of the electric furnace is 30t. When de-steeling, aluminum or composite deoxidizer is used for deoxidation. LF refining can achieve deoxidation by adding enough aluminum, silicon carbide or calcium carbide, properly control the oxygen content of molten steel and measure its activity; after LF refining The steel is subjected to VOD/VD treatment, and when the degree of vacuum reaches 0.5 Torr, it stays for more than 15 minutes, and finally is poured into an ingot by argon gas protection.
Classification
According to the application, it can be divided into steel for truck shaft and steel for passenger axle; according to chemical composition, it can be divided into carbon steel and alloy steel axle. Among them, trucks and ordinary passenger cars are mainly carbon steel, and high-speed trains are mainly made of alloy steel. According to China's steel classification standards, the carbon content of truck axle steels used in the world is changing between 0.35% and 0.57%. It is a medium-carbon high-quality carbon steel, and high-speed trains use low-carbon alloy steel. In recent years, with the development of high-speed railway vehicles, alloy steel hollow axles have developed rapidly.
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