Cemented carbide inserts for notch and wear demanding turning in heat resistant super alloys (HRSA) and stainless steels

摘要

The present invention relates to a cutting insert for turning in heat resistant super alloys and stainless steels comprising a substrate and a coating. The substrate consists of WC 5-7 wt-% Co and 0.15-0.60 wt-% TaC and 0.10-0.50 wt-% NbC and balance WC, has a coercivity of 19.5-24.5 kA/m and a CW-ratio between 0.85-1.00. The coating comprises a homogeneous Al x Ti 1-x N-layer with x=0.6-0.7 and a thickness of >1 µm but <3.8 µm.