Patent ID: 7767319

Claim:
Cutting tool insert comprising a cemented carbide substrate and a coating wherein: the substrate comprises from about 5 to about 7 wt-% Co, from about 140 to about 250 ppm Ti+Ta and balance WC with a weight ratio Ti/Ta of from about 0.8 to about 1.3, a coercivity, Hc, of from about 15.5 to about 19.5 kA/m, and a CW-ratio of from about 0.81 to about 0.95, and the coating comprises a homogeneous layer of Al x Ti 1−x N, with x =from about 0.5 to about 0.7 with a total thickness of from about 0.5 μm to about 15 μm, on the rake side and from about 2 μm to about 7 μm on the flank side.