(7) Ti-15V-3Cr-3Sn-3Al alloy
Ti-15V-3Cr-3Sn-3Al alloy was developed around 1980. This solution
heat-treated material has excellent cold workability and, in
the form of a thin sheet, a strength higher than that of pure titanium
JIS H 4600 (TP550H) can be obtained. For airframes, welded pipes
and ducts made by welding thin sheets are used. The major relevant
standard is AMS 4914. Yield strength of the solution heat-treated
material is 690-835 MPa, tensile strength is 745-945 MPa, elongation
is 12% or higher, the yield strength of STA material is
965-1,170 MPa, tensile strength is 1,000 MPa or higher, and elongation
is 7% or higher.3)