There are four grades of commercially pure titanium, categorized by strength, so the most appropriate material can be selected
according to the required strength and workability. They are used
for non-structural applications, such as water supply systems for
galleys and sanitary, and for ducts and piping, many of which require corrosion resistance and good formability

Ti-6Al-4V alloy is designed for a good balance of characteristics, including: strength, ductility, fracture toughness, high temperature strength, creep characteristics, weldability, workability, and thermal processability (higher strength is easily obtained by heat treatment). This alloy is therefore used for many airframe and engine parts. Furthermore, there are many actual applications of this alloy in aircraft where high reliability is required, and further, the availability of abundant data promotes its application. In airframes,it is used for general structural material, bolts, seat rails and the like.In engines, due to the relatively low allowable temperature of about 300˚C, the alloy is used for fan blades, fan case and the like in the intake section where temperatures are relatively low. Major relevant standards are JIS H 4600 (TAP 6400H) and ASTM G5. The yield strength of annealed material is 825 MPa or higher, tensile strength is 895 MPa or higher, and elongation is 10% or higher at room temperature.3)