Stainless steels have a wide range of uses in the industry due to their high corrosion resistance and high formability capabilities. Stainless steel flat materials are produced with hot rolling process after casting, annealing and cold rolling. After these processes, stainless steel prepared for service lines by annealing and surface passivation. In this study, after the tensile tests of the materials of different thicknesses after rolling the AISI 304 stainless steels in different deformation ratios before and after solution annealing, true yield and tensile strengths were calculated based on engineering tensile and true tensile strengths. Using of these calculated values, the strength constant and deformation hardening base values of the materials subjected to cold working in the mill were theoretically tried to be calculated, and the relationship between these values and the hardening ability formed by the alloy elements that make up the material were investigated.