Coated cutting tool

摘要

A coated cutting tool with a hard coating layer formed on a substrate. The substrate comprises a binder phase and a hard phase. The coating layer comprises a smooth face having a surface roughness of 0.2 mum or less substantially at the blade-edge ridge and in a region which extends at least 200 mum from the rake face side boundary of the ridge toward the rake face side, and extends at least 50 mum from the flank side boundary of the ridge toward the flank side.