In metal working, the flow stress vs. true strain diagram (flow curve) is the most important data for the calculation of the forming force and of the deformation work.It is a well known fact, that the flow curve is a function of the true strain, the strain rate, the process temperature during deformation, and the grain structure (microstructural properties) of the tested metal.However, in cold forming at room temperature, the parameter strain rate is in general of negligible value regarding the value of the flow stress.For the determination of the flow stress vs. true strain diagram at room temperature, the uni-axial isothermal compression test is often used.The determination of the flow curve by using the standard metal forming processes, e.g. cold extrusion or drawing, is also of interest, because of the fact, that the state of the stress in the tested specimen during compression test can not be compared regarding the state of stress in the workpiece during the standard cold forming processes: cupping, bar extrusion, hollow extrusion, or drawing.After compression test, cupping, and drawing operation, the main process parameters, i.e. microstructure, strain, strain rate, and hardness, were under study.