An experimental procedure is proposed and presented, for determining some corrected values for two coefficients that appear into the relationship for the residual stresses determination. The method is based on some tensile tests on specimens (from the studied material) that are instrumented with a special strain gage rosette (for the hole drilling strain gage method). Every specimen is twice loaded - before and after the hole drilling process. The resulted stress-strain dependences (for the three transducers of the rosette) are used for the calculus of some material parameters, included into the determination of corrected values, for the two above-cited coefficients.