Medium-carbon, low-alloy steelsSteel alloyed with Si, Mo, and V represent an alternative for structural applications that require high strengthStrength, ductility, and thermal stability. In this work, an experimental steelSteel alloyed with Si, Mo, and V was subjected to thermal cycles of austemperingAustempering and quenching-temperingTempering. The microstructuresMicrostructure were characterized by optical microscopy and X-ray diffraction, while mechanical performance was assessed through Vickers microhardness and uniaxial tensile tests. AustemperingAustempering cycles resulted in bainitic and martensitic microstructuresMicrostructure, accompanied by retained austenite, while the predominant microstructureMicrostructure in the temperingTempering was tempered martensiteMartensite, confirmed by XRDX-Ray Diffraction (XRD). AustemperingAustempering treatments offer lower mechanical strengthsStrength with greater strain hardening capacity, but at the expense of reduced ductility. In contrast, tempered steelsSteel have higher strengthsStrength, accompanied by better elongation percentages. The results confirm that the microstructureMicrostructure influences the mechanical propertiesMechanical properties; the best mechanical performance is achieved through low-temperatureTemperature temperingTempering treatments.