The general principles of thermomechanical treatment for ensuring isotropy of mechanical properties are discussed. The deformation conditions of isotropy are formulated, and an expression is derived for estimating the intensity of plastic deformation during the treatment which may consist of several cycles. As a specific example of a treatment of this kind a high-temperature thermomechanical treatment of steel ShKh15 and 37KhN3A torsion bars (involving a single deformation cycle in torsion) is considered.