This titanium alloy in the form of bars up through 101.60 mm in nominal diameter or least distance between parallel sides, inclusive, forgings of thickness up through 4 inches (101.60 mm), inclusive, and stock for forging of any size.


Element Min Max
Vanadium 7.5 8.5
Chromium 5.5 6.5
Molybdenum 3.5 4.5
Zirconium 3.5 4.5
Aluminum 3 4
Iron 0.3
Oxygen 0.12
Carbon 0.05
Nitrogen 0.03(300ppm)
Hydrogen 0.02(200ppm)
Yttrium 0.005(50ppm)
Other Elements, each 0.1
Other Elements, total 0.4
Titanium remainder

The composition similar to UNS R58640.


Metastable beta-titanium alloy is the strongest titanium alloy after precipitation hardening. Ti–3Al–8V–6Cr–4Mo–4Zr alloy. After solution treatment, the alloy is mainly composed of a body-centered cubic β phase. It has high plasticity but average strength, with the yield strength being only 860MPa. However, after post-aging treatment, extremely high strength can be achieved, and its yield strength (>1600MPa) is almost doubled.