CEMENTED CARBIDE WITH REFINED STRUCTURE

摘要

The present invention relates to a coated cemented carbide milling insert for either wet or dry machining of cast iron such as nodular cast iron (NCI), grey cast iron (GCI), austempered ductile iron (ADI) and compacted graphite iron (CGI) where a high wear resistance and an excellent resistance against thermo cracks are required comprising:
-a substrate comprising 5-7 wt-% Co, 140-250 ppm Ti+Ta and balance WC with a weight ratio Ti/Ta of 0.8-1.3 and
-a PVD-layer consisting of Al x Ti 1-x N, with x 0.50-0.70 and with a thickness of 1-10 µm.
The invention also relates to a method for making cutting tool inserts.