Features of a competitive diffusion of individual alloying elements in hightemperature β-phase of titanium alloys of the metastable β-class under nonequilibrium conditions of continuous rapid heating are investigated using a few commercial alloys. As established, the rate of diffusion redistribution of alloying elements in β-phase depends not so much on their total concentration (expressed by the integral content of β-stabilizing elements in molybdenum equivalent Mo 0 C ), but on the rates of diffusion of individual elements. Iron concentration is homogenized thought high-temperature β-phase at first, chromium concentration equalizes somewhat slower, and the concentration of β-stabilizers of isomorphic type (like vanadium or molybdenum) smoothes most slowly. This leads to the fact that, similarly to carbon steels, in the titanium alloys of metastable β-class under non-equilibrium conditions of rapid heating in the beginning the para-(partial) and then the ortho-(complete) equilibrium distributions are formed for β-stabilizers of eutectoid and isomorphic type, respectively.