Ferritic stainless steel AISI 430 is one of the most widely produced stainless steels worldwide. It has good corrosion resistance in moderate corrosive environments, good drawability and an aesthetically attractive surface. For applications that require better drawability or weldability, the addition of stabilizing elements promotes the formation of carbonitrides that prevent the formation of martensite and the phenomenon called sensitization. To perform simulations of forming of these steels, either by analytical or numerical methods, the flow curves characterization of these materials is required. In this work, two different methods were used to obtain the flow curves of AISI 430 (standard) and AISI 430 DDQ (niobium stabilized) steels. The first method consisted of tensile testing of cold-rolled samples, each sample being at a different deformation level. The pilot rolling mill at the Aperam South America research facility was used to prepare the samples. The second test consisted of plane-strain compression tests performed in the mechanical testing laboratory of the metallurgy department of the Federal University of Minas Gerais, using devices adapted to a universal tensile machine. The raw materials used were samples of hot-rolled, annealed and pickled coil sheets. In both tests, replicates were performed to provide greater reliability of the results. Through transformations made using the Levy–Mises equations, the flow curves of each steel were plotted and compared. The results showed similarity between the two methods when considering the yield strength of the samples tested by tension at 0.2% strain, with a small variation in the AISI 430 DDQ steel for true strains above 0.5. From the data obtained in the tests, the coefficients of the Hollomon equation were then established for both steels.