Cemented carbide inserts for parting, grooving and threading

摘要

The present invention relates to a cutting insert for parting, grooving and threading in steel and stainless steels comprising a substrate and a coating. The substrate comprises WC, 7.5-10.5 wt-% Co, 0.7-1.1 wt-% Cr and 100-300 ppm Ti. Ti may partly be replaced by Ta to a weight ratio Ti/Ta of ≥0.8. The coating comprises two (Ti,Al)N-layers with different Al/Ti-ratios: an inner Al_yTi_1-yN-layer with y=0.4-0.67 with a thickness of 0.3-2.5 µm and an outer Al_wTi_1-wN layer with w=0.15-0.35 with a thickness of 0.5-5.0 µm.