Titanium is one of the elements with high abundance in the crust, ranks ninth with 0.64% proved content in the crust. Titanium has low density, high specific strength and corrosion resistance. Titanium and titanium alloys are widely used in aerospace, petrochemical, electric power, seawater desalination and other industries, below are different titanium and titanium alloys and related Chemical compositions,

       ① Industrial Pure titanium
                   Fe         C         N         H          O
  TA0       0.15    0.10    0.03    0.015    0.15
  TA1       0.25    0.10    0.03    0.015    0.20
  TA2       0.30    0.10    0.05    0.015    0.25
  TA3       0.40    0.10    0.05    0.015    0.30
  Gr1       0.20    0.10    0.03    0.015    0.18
  Gr2       0.30    0.10    0.03    0.015    0.25
  Gr3       0.30    0.10    0.05    0.015    0.35
  Gr4       0.50    0.10    0.05    0.015    0.40
  BT1-00    0.15    0.05    0.04    0.008    0.10
  Excepting welding wire,allowing Al≤0.30℅
  BT1-0     0.25    0.07    0.04    0.010    0.20
  allowing Al≤0.70℅
  TA0ELI    TA0-1    TA1ELI      TA2ELI
  TA3ELI
  ②  Industrial titanium alloy—α and Near α titanium alloy
  TA4           Ti-3Al
  TA5           Ti-4Al-0.005B   (Al:3.3-4.7%)
  TA5-A         TI-4Al-0.005B   (AL:3.7-4.5%, Marine titanium alloy )
  TA6 (BT5)           Ti-5Al
  TA7(Gr.7, BT5-1)   Ti-5Al-2.5Sn (Al:4.0-6.0%)
  TA7-D     Ti-5Al-2.5Sn(Al:4.5-5.75%,ELI  applied-155—-255℃)
  TA8           Ti-5Al-2.5Sn-3Cu-1.5Zr( Removed from GB standard)
  TA9           Ti-0.2Pa
  TA10          Ti-0.3Mo-0.8Ni
  TA11(Ti-811)        Ti-8Al-1Mo-1V
  TA12(Ti-55 plate)   Ti-5.0Al-4.2Sn-2.0Zr-1.5Mo-0.25Si-1.0Nd
  (Ti-55  bar)   Ti-5.4Al-4.2Sn-2.0Zr-1.0Mo-0.25Si-1.0Nd
  TA13(Ti-230,IMI230)       Ti-2.5Cu
  TA14(Ti-679,IMI679)       Ti-2.25Al-11Sn-5Zr-1Mo-0.25Si
  TA15(BT20)                Ti-6.5Al-1.5Zr-1Mo-1V
  TA15-1(BT201CB)           Ti-2.5Al-1.5Zr-1Mo-1V
  TA15-2(BT202CB)           Ti-4.0Al-1.5Zr-1Mo-1V
  TA16(ПT-7M)              Ti-2Al-2.5Zr
  TA17(ПT-3B)              Ti-4Al-2V
  TA18(Gr.9)                Ti-3Al-2.5V
  TA19(Ti-6242S)            Ti-6Al-2Sn-4Zr-2Mo-0.1Si
  TA20(CПT-2)             Ti-4Al-3V-1.5Zr
  TA21(OT4-0)               Ti-1Al-1Mn
        ②  Industrial titanium alloy—β and Near β titanium alloy
  TB1            Ti-3Al-8Mo-11Cr ( Removed from GB standard)
  TB2            Ti-3Al-5Mo-5V-8Cr
  TB3            Ti-3.5Al-10Mo-8V-1Fe
  TB4            Ti-4Al-7Mo-10V-2Fe-1Zr
  TB5(Ti-15-3-3-3)   Ti-15V-3Cr-3Sn-3Al
  TB6(Ti-1023)   Ti-10V-2Fe-3Al
  TB7(Ti-32Mo)   Ti-32Mo
  TB8(β-21S)     Ti-15Mo-2.7Nb-3Al-0.2Si
  TB9(βc ,Ti-38644) Ti-3Al-8V-6Cr-4Mo-4Zr  (Used to produce titanium springs)
  Ti-15-5-3       Ti-15Mo-5Zr-3Al
  ③ Industrial Titanium alloy——(α+β) titanium alloy
  TC1(OT4-1)      Ti-2Al-1.5Mn
  TC2(OT4)        Ti-4Al-1.5Mn
  TC3             Ti-5Al-4V
  TC4(Gr.5  BT6)  Ti-6Al-4V
  TC5             Ti-5Al-2.5Cr
  TC6(BT3-1)      Ti-6Al-1.5Cr-2.5Mo-0.5Fe-0.3Si
  TC7             Ti-6Al-0.6Cr-0.4Fe-0.4Si-0.01B
  TC8             Ti-6.5Al-3.5Mo-0.25Si
  TC9             Ti-6.5Al-3.5Mo-2.5Sn-0.3Si
  TC10(Ti-662)    Ti-6Al-6V-2Sn-0.5Cu-0.5Fe
  TC11(BT9)       Ti-6.5Al-3.5Mo-1.5Zr-0.3Si
  TC12            Ti-5Al-4Mo-4Cr-2Zr-2Sn-1Nb
  TC15(Ti-5Al-2.5Fe)       Ti-5Al-2.5Fe
  TC16(BT16)      Ti-3Al-5Mo-4.5V
  TC17(Ti-17)     Ti-5Al-2Sn-2Zr-4Mo-4Cr
  TC18(BT22)      Ti-5Al-5Mo-5V-1Cr-1Fe
  TC19(Ti-6246)   Ti-6Al-2Sn-4Zr-6Mo
  TC20(IMI367)    Ti-6Al-7Nb
  TC21(Ti-62222S)  Ti-6Al-2Zr-2Mo-2Sn-2Cr-0.25Si
  ④ Other titanium Alloys
  Ti-60          Ti-5.6Al-4.8Sn-2.0Zr-1.0Mo-0.35Si-0.85Nd
  BT8            Ti-6.5Al-3.3Mo-0.3Si
  BT18           Ti-7.7Al-11Zr-0.6Mo-1Nb
  BT18y          Ti-6.7Al-4.0Zr-2.5Sn-0.7Mo-1.0Nb-0.15Si
  BT25           Ti-6.8Al-1.7Zr-2Sn-2Mo-0.7W-0.2Si
  BT25y          Ti-6.5Al-3.7Zr-1.7Sn-4.0Mo-1W-0.2Si
  BT14           Ti-4.5Al-3Mo-1V
  OT4-2          Ti-6Al-1.5Mn
  Ti-3111         Ti-3Al-1V-1Mo-1Zr
  Ti-70           Ti-2.5Al-2.0Zr-1Fe-0.1O
  Ti-31           Ti-3Al-1Mo-1Ni-1Zr
  Ti-75           Ti-3Al-2Mo-2Zr
  Ti-80           Ti-6Al-3Nb-1Zr-1Mo
  Ti-91           Ti-3.4Al-1V-1Fe-0.6Zr
  Ti3Al           Ti-12.8Al-31.1Nb-1.92Mo
  SP-700          Ti-4.5Al-3V-2Mo-2Fe