Heat treatable titanium alloy

A meta-stable β titanium alloy comprising

• 7.5 to 8.5 wt. % vanadium,
• 5.5 to 6.5 wt. % chromium,
• 3.5 to 4.5 wt. % molybdenum,
• 3.5 to 4.5 wt. % zirconium,
• 3 to 4 wt. % aluminum,
• up to 0.30 wt. % oxygen,
• a maximum of 0.3 wt. % iron,
• nitrogen up to 0.03 wt. %,
• hydrogen up to 0.03 wt. %,
• a maximum of 50 ppm yttrium,
• a maximum of other elements comprising unavoidable impurities present at 0.15 wt. % each and 0.40 wt. % in aggregate,
• with a balance (apart from carbon) of titanium;
• the alloy having carbon present at a stable total carbon level sufficiently in excess of 0.05 wt. % achieving an improvement in the mechanical properties of ultimate tensile strength (UTS), double shear strength (DSS) and fatigue strength in threaded regions relative to standard Beta-C alloy with a specified carbon level below 0.05 wt. %, with a maximum stable total carbon content of 0.2 wt. %, the stable carbon comprising carbon in solid solution and thereby controlled so as to preclude carbide formation having a detrimental effect on the level of fatigue strength,
• wherein, when drawn as a 10 mm to 20 mm rod, the titanium alloy exhibits one or more of:
• a UTS of about 1500 MPa or more, an elongation of about 9% or more, or a DSS of about 824 MPa or more.