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This paper deals with machining of ferritic martensitic steel in regime of semi-finishing cut. For machining of steel grade P91 two kinds of cutting material, which are called type "A" and type "B" at this paper, were chosen. Main part is interested to choose of suitable cutting conditions (cutting speed, feed rate) for these two materials of cutting tool. The main criterion is tool life of cutting tool. At the end, the best cutting conditions for machining of real steam turbine are recommended.