The powders used in additive manufacturing (AM) are important factors in the quality of the final manufacturedpart, where reliable flowability is critical. Predicting and measuring the flow of powder is very complex because ofthe large number of variables involved. Powder flow is influenced by the physical properties of the powder, such asthe particle size, distribution, and shape, as well as the environment and conditions applied during AM. Becauseflow is not a fundamental material property, there is no measurement device or test that can fully understand thepowder flow behavior. In this study, a method for analyzing the rheological characteristics of metal powders ispresented, and each analysis item is considered by measuring the physical, chemical, and flow characteristics of threetypes of STS630 (17-4PH stainless steel) metal powders for PBF.