A passive industrial experiment has been carried out, which consists in processing data on the mechanical properties of 15G steel wire after the annealing operation and after the calibration operation. It was revealed that under production conditions the ranges of deformation indices fluctuate within the following limits: relative reduction 3,5-7,8%; logarithmic strain deformation 0,04-0,08; elongation ratio 1,04-1,09. It was found that for a given range of deformations, the relative narrowing after rupture is practically independent of the presence of a calibration operation and amounts to 81%. At the same time, during calibration, the average values of ultimate strength increase from 434 MPa to 478 MPa, i.e. by an average of 10%. A high level of variance of the samples of tensile strength up to 321 MPa2 for the annealed state and 354 MPa2 for the calibrated state was also revealed, which is explained by the different state of the tool at the drawing stage.