Abstract
The studies made regarding the elaboration of some low alloyed steels of high resistance refer to the construction of some equipment that has maximum fatigue resistance on different directions, the steel having remarkable tenacity and ductility. In this category one can find the romanian steel 15VMoCr14X, pure in what concerns the gas content (azote, hydrogen) and non-metallic inclusions, having an advanced chemical and structural homogeneity. The characteristics of deformability are studied, which are represented by plasticity and deformation resistance, and the optimum temperature for heat processing is determined. After rolling the 3.6 tone ingots in half-finished products of blum □ shape of 250mm, a fist thermal treatment was applied to re-establish the resulted structure after deformation, which is formed out of ferrite and globular perlite with a bainitic orientation. The obtained granulation was inhomogeneous. Its correction to a more fine and uniform granulation was realized through a second thermal treatment after a previous rolling at a profile of □150mm. From the experimented secondary thermal treatments was chosen for the industrial practice the optimum one. A more homogeneous and finer granulation is observed, which determines an increase of the mechanical characteristics, especially resistance and fatigue resistance.
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