Cemented carbide inserts for milling of hard fe-based alloys more than 45 HRC

摘要

The present invention relates to cutting insert for milling of hardened steels, tool steels and hard cast irons and stainless steels with a hardness of more than about 45 HRC comprising a substrate and a coating. The substrate has a hardness of from about 1700 HV3 to about 2000 HV3, with a 10° angle and 0.2 mm wide negative chamfer giving an edge sharpness of 0(sharp) to about 40 mum and the coating comprises a homogeneous Al_xTi_1-xN-layer with x=from about 0.6 to about 0.67, preferably x=about 0.62 and a thickness of more than about 1 to less than about 3.8 mum. The invention also relates to a method of making as well as the use of the inserts.