Titanium and its alloys of specific strength (strength to weight ratio) in the metal structure materials is very high, its strength and steel equivalent, but its weight is only 57% of steel. In addition, titanium and its alloys are very heat-resistant, in the atmosphere at 500 ℃ can still maintain good strength and stability, short-term working temperature can even be higher. Aluminum at 150 ℃, stainless steel at 310 ℃ on the loss of the original mechanical properties. When the aircraft, missiles, rockets, high-speed flight, its engine and surface temperature is quite high, aluminum alloy has not been able to cope with, at this time, the use of titanium alloy is very suitable. It is because of titanium and its alloys with high strength, light weight, heat resistance and strong comprehensive performance, in the aircraft manufacturing with it to replace other metals, not only can extend the service life of the aircraft, but also can reduce its weight, thereby greatly improving its flight performance. Therefore, titanium is one of the most promising structural materials in the aviation industry and the cosmic industry.

Titanium and its alloys are mainly used in the aerospace industry to manufacture aircraft engines and fuselages. Generally speaking, the Mach number is less than 2 aircraft, its engine using part of the titanium and its alloys, fuselage generally use aluminum alloy. Mach number equal to 2 aircraft, the amount of titanium used in its engine increased, and part of the fuselage also need to use titanium. Mach number greater than 3.5 aircraft, its engine inlet temperature has been very high, can not use titanium alloys and the need to use superalloys, but the amount of titanium fuselage with a significant increase in the amount of titanium.

Titanium and its alloys also have good low-temperature resistance, even at the ultra-low temperature of -250 ℃, it still has a high impact strength, can be resistant to high-pressure vibration, therefore, titanium and its alloys in rockets, missiles and spaceships are not only used in the manufacture of engine shells and structural components, but also used in the manufacture of high-pressure containers, such as high-pressure gas cylinders, low-temperature liquid fuel tanks and so on.