Abstract: The technique of reverse coefficient analysis concerning the model of the material rheological properties (Johnson-Cook Constitutive Model) at its high-speed milling which allows, regardless of the deformation component to calculate reliably the coefficients of a viscoplastic hardening and thermal softening. The use of this technique reduces the number of calculations with the use of FEM by grouping the experiment results. The example of coefficient calculation for the material with the following chemical composition (C-0,1% Ni-23% Cr-10% Ti-3% Mo-1,3% Al-0.8 rest <1%) is presented.