In this work, the porous sintered steel Astaloy Mo+0,2C is observed with three different densities of 6,5 g/cm3, 6,8 g/cm3 and 7,1 g/cm3. Porous sintered steels show many advantages compared to steels manufactured by the classical ways of manufacturing. With the selective application, they can bring great economic and ecological value. To describe the behavior of sintered steels in diverse ranges of applications by numerical simulations, it is needed to describe the constitutive behavior of sintered steel as accurately as possible. Main goal of this work is to observe the constitutive behavior of the material Astaloy Mo+0,2C for three different densities of material in elastic and elastoplastic range. Obtained material parameters will be validated by comparing the numerical simulations and available experimental tests. Constitutive behavior of material will be determined by the Ramberg - Osgood model, isotropic hardening model, kinematic hardening model and combined hardening. Obtained material parameters for each of these models are used for numerical simulations of monotonic tensile tests whose results are validated on experimental monotonic tensile tests. Also, the simulations of cyclic tests will be conducted for models of combined hardening for all three densities for ratios of load amplitudes 𝑅= −1 and 𝑅= 0,05 where the results of obtained hystereses will be commented on. Material parameters are obtained in software package Excel and all numerical simulations are conducted in software package Abaqus. Obtained material parameters described the constitutive behavior very accurately for all three densities. Validations are conducted for monotonic tests and partially on available cyclical tests. For further validation of these parameters, new cyclical experiments can be conducted with different types of hystereses and material parameters can be further validated.