COATED CUTTING INSERT

摘要

A coated indexable cutting insert (1) for wet and dry milling of cast irons is provided. The substrate of the insert (1) is composed of a cemented tungsten carbide based composition containing about 5.7 to about 6.4 weight percent cobalt and about 2.9 to about 3.6 weight percent tantalum. The coating includes two coatings of differing composition. The first coating is selected from titanium carbide, titanium carbonitride, and titanium nitride. The second coating is alumina.