Titanium and its alloys specific strength (strength to weight ratio) in the metal structural materials is very high, its strength and steel equivalent, but its weight is only 57% of the steel. In addition, the heat resistance of titanium and its alloys are strong, in the atmosphere of 500 ℃ can still maintain good strength and stability, but also short-term operating temperature even higher. The aluminum 150 ℃, stainless steel at 310 ℃ to lose their mechanical properties. When the aircraft, missiles, rockets flying at high speed, the engine and the surface temperature is very high, aluminum was not competent, then, using titanium is very appropriate. It is because when titanium and its alloys have high strength, light weight, high heat resistance of the overall excellent performance, aircraft used in it instead of other metals, not only prolong the life of the aircraft, but also reduce its weight, thereby greatly improve its flight performance. Therefore, titanium is one of the structural materials in the aviation industry and the universe's most promising industries.

     Titanium and its alloys are mainly used in the aviation industry, the manufacture of aircraft engine and airframe. Generally, aircraft Mach number less than 2, the engine uses a portion of titanium and its alloys, aluminum alloy body in general. Mach 2 is equal to the aircraft, its engine to increase the amount of titanium and titanium fuselage section required. Greater than Mach 3.5 aircraft, the engine inlet temperature is very high, can not be used titanium and superalloys required, but significantly increased the amount of its body with titanium.

     Titanium and its alloys also have good low temperature performance, even at ultra-low temperature -250 ℃, and it still has a high impact strength, high pressure, anti-vibration, therefore, titanium and its alloys in rockets, missiles and spacecraft not only for the manufacture of the engine casing and structural components, and for the manufacture of pressure vessels, such as high-pressure gas cylinders, cryogenic liquid fuel tanks.