Three sinter steel materials, AD15, AD4 and Astaloy CrM, have been under evaluation in this study. The study has been focusing on three types of trials in order to see how the sintering parameters influence the reduction of oxides. The first series of trails were focused on how the green body density affects the reduction rate. The second and third series of trail were more focused on the sintering parameters, i.e. sintering time and sintering atmospheres, respectively. For sinter steel pellets a clear effect of the green body density can be seen on PAS and oxygen analyses. A higher green body density decreases the oxygen reduction reactions during sintering and results in higher oxygen content in the final pellet. How the hydrogen content in the sintering atmosphere affects the reduction efficiency is still not clear as the results from the PAS and the chemical and microstructure analysis had different outcome. Further studies are required. The total reduction time has effect on the reduction result i.e. a longer reduction time will reduce more than a faster reduction time.