China's industrial pure titanium is divided into four grades according to GB/T3260- 1994 Titanium and Titanium Alloys: TAO, TA 1, TA2 and TA3. American ASTM is divided into Gr 1, Gr2, Gr3 and Gr4, and Japanese JIS standard is divided into 1, 2, 3 and 4. In addition, according to the phase composition of the alloy in equilibrium and metastable state, titanium alloys can be divided into α, near α and α+? , near? 、? Wait for five categories; But it is customary to divide titanium alloys into α and α+? And then what? Three categories. According to the characteristics of service performance, it can be divided into structural titanium alloy, heat-resistant titanium alloy and anti-titanium alloy. In the national standard brand of titanium alloy in China, TA series represents α titanium alloy; TB series representative? T-type titanium alloy; TC series stands for α+? T-titanium alloy.