Patent ID: 6884497
Filing Date: 2005-04-26
Classification: B23B,C22C,C23C,Y10T

Abstract:
1. A cutting tool insert comprising a cemented carbide body and a coating, the cemented carbide body comprising 7.9-8.6 wt % Co, 0.5-2.1 wt % total amount of cubic carbides of the metals Ta and Nb, a ratio of the weight concentrations of Ta and Nb being 1.0-12.0, and balance WC with a mean intercept length of 0.4-0.9 μm, a binder phase being alloyed with W corresponding to an S-value of 0.81-0.95, and said coating comprises a layer of Ti x Al y N where 0.8<x+y<1.2, with 0.25<x/y<1.45 and a thickness of 0.5-7 μm with columnar grains.