To examine the mechanical behavior of a sintered steel, Astaloy™ 85 Mo, an experimental investigation was conducted using uniaxial tensile testing. The samples analyzed were processed to varying amounts of porosity, as well as at different sintering times and temperatures. Test data is used to determine constitutive parameters and strength. The influence of porosity on these properties is discussed. In an ongoing effort to formulate constitutive models of the sintered material, additional testing (in particular uniaxial compressive and indentation testing) to determine, for example, the compressive yield behavior, is planned.