CUTTING EDGE-REPLACEABLE CUTTING TOOL

摘要

An indexable cutting tool 100 includes a cermet including 75 to 95 mass% a hard phase and a balance of a binder phase and inevitable impurities, the binder phase containing an iron group metal. The cutting tool 100 includes a layer of a structure A and a layer of a structure B extending from an inner peripheral face 5r of a mounting hole 5 toward the inside of the cutting tool, and further includes a structure C within the cutting tool beyond the layer of the structure B. An outermost surface portion of a cutting edge section 4r of the insert 100 is composed of the structure C. The structure A is substantially composed of the binder phase, the structure B is composed of TiCN and the binder phase, and the structure C is composed of the hard phase and the binder phase.