In the present study, in a quenching-partitioning (Q-P) process, the effects of partitioning time (Pt) and partitioning temperature (PT) on the mechanical and microstructural properties of a microalloyed Fe-0.21C-1.5Si-2.2Mn-0.054Al-0.08Ti steel were studied. The XRD and SEM results confirmed increases in retained austenite (γR) volume fraction (VγR) and (γR)carbon concentration by increasing Pt and PT. XRD patterns confirmed reduction in (VγR)by further increasing the Pt and PT over 500 sec and 390°C, respectively, due to super-saturation of austenite (γ) with carbon. PT of 390°C and Pt of 500 sec were recorded as the optimum values for PTs and Pts, which allowed the present steel to obtain higher formability and higher fracture strain characteristics, while retaining higher hardness and strength. The highest yield and tensile strength, hardness and fracture elongation were obtained for the sample partitioned at 390°C for about 500 sec, which were about 741MPa, 1366 MPa, 424 HV and 25.2 %, respectively.