Abstract: The 0.08C-1.2Mn-0.15Si steel was investigated for the effect of annealing and quenching processes in γ + α region on the microstructures and properties of such strips of which the initial structures are different. It was found that under the same heat-treatment regime the finer the grains are, the more the volume fraction of martensite is. If the initial structures are the same, the volume fraction of martensite increases slowly with the lengthening holding time for 2-30 min. The tensile strength of specimens comes up to 600 MPa after annealing and quenching processes, and the initial work hardening index n varies in the range 0.17-0.22, with the ratio Rel/Rm 0.5-0.6 and percentage elongation higher than 20%.