The paper presents the results of the industrial tests of cutting tools sub
jected to the nitrogen ion implantation, both conventional and performed us
ing the PIII (Plasma Immersion ion Implantation) process. The tools were ma
de of NC10 and SW7M tool steel. The nitrogen doses ranged from 3x10(17) cm(
-2) to 2x10(18) cm(-2). Significant improvements of the tool life have been
found.