Coated insert

摘要

A cutting tool insert particularly for turning of steel comprising a body and a coating with a first (innermost) layer system of at least two layers of TiC x N y O z with x+y+z‰¤1 with a total thickness of 0.7-4.5 µm, a second layer system to a large extent consisting of Al 2 O 3 and an outermost layer system comprising one or several layers in sequence of TiC x N y (x+y‰¤1) with individual thicknesses of >0.15-0.8 µm and a layer with Al 2 O 3 with a thickness >0.1-0.4 µm with a total thickness of the outermost layer system thinner than 2.5 µm and a total thickness of the coating in the range 2.0 to 12.0 µm.