Cutting tool insert and method for the preparation thereof

摘要

The present invention discloses a coated cutting insert particularly useful for intermittent cutting in low alloyed steel. The insert is characterised by a WC-Co-based cemented carbide body having a highly W-alloyed Co-binder phase and a coating including an innermost layer of TiCxNyOz with columnar grains and a top coating of a fine grained, textured alpha -Al2O3-layer.