Automobile structural parts made of titanium alloy are mainly valve, spring and its bearing, connecting rod, crankshaft, gearbox, steering rack and pinion of engine system, spring, muffler, exhaust device of chassis system, wheel bushing and bearing and all kinds of half shaft, fasteners of car body system, etc. Titanium has been used extensively in racing car parts because racing cars are driven to win and be safe, regardless of cost.

Automobile valves made of titanium alloy can not only reduce the mass and prolong the service life, but also improve the reliability and save fuel. The engine's Max speed was increased by about 10% with the adoption of γ-Ti Al alloy, which was previously used in titanium alloys with high manufacturing costs. In recent years, some titanium producers have developed a batch of lower price titanium alloys for engine valves and some have entered the mass production stage. Improving the wear resistance of titanium alloy used for valves is a key technology. It is one of the effective techniques to improve the surface hardness and wear resistance to oxygenate the surface, even if the solid solution in titanium is as much oxygen as possible.

The working temperature of the exhaust valve is high, which can be made of high-temperature titanium alloy Ti-6Al-2Sn-4Zr-2Mo-0.1Si (6242s) alloy. But the motorcycle valve is more likely to be exposed to high temperature for a long time, so it is appropriate to choose more heat resistant Timetal-1100 (Ti-2.7Sn-4Zr-0.4Mo-0.45Si) alloy, it is one of the best heat resistance titanium alloy. The working temperature of about 600℃. The exhaust valve of two wheels motorcycle is best made of titanium alloy which can work for a long time at 800℃. At the same time. The alloy should have a high damage tolerance, so researchers hope to develop AlTi3 and AITi based intermetallic compound new titanium alloys and some results have been achieved. Representative alloys are: Ti- 14al-21Nb, Ti- 14al-21NB-3V-2Mo, Ti- 24al-10Nb, Ti- 25al-8NB-2Mo-2Ta, Ti- 25al-10NB-3V-1Mo and Ti-22AI-27Nb, but they are not cheap.