The most recent trends in high-tech of using new steel materials with special metallurgical elaboration, instead of the old steels with standard metallurgical elaboration, appear in the subject of our study. From the new (40CD4X) and old (42CrMo4) steels' charges were extracted round short samples (L0=5d0) and they were tested on the universal Zwick – Rel 1875 machine, with the following regimes: were programmed two test speeds from the domain of quasi-static speeds, at every speed were programmed many temperature steps. The results obtained, processed and analyses have reflected the superiority of the special metallurgical elaboration steel, being justified their use in the new models of Dacia’s gearboxes.
