SURFACE-COATED CUTTING TOOL WITH HARD COATING LAYER EXHIBITING EXCELLENT WEAR RESISTANCE

To provide a coated tool which has a coating layer with excellent toughness, and exhibits excellent chipping resistance and wear resistance over a long term use even when the tool is used for high-speed continuous cutting processing of stainless steel or the like.SOLUTION: A surface-coated cutting tool includes a hard coating layer, which is formed by laminating a plurality of layers including a first layer and a second layer on it, on a surface of a tool base body. The first layer, which is in contact with a tool base material, out of the hard coating layer is a TiN layer. An average particle size of TiN crystalline grains for structuring the TiN layer is 30 nm or less in an interface area within a range of 0.1 μm from an interface between the tool base body and the TiN layer. The interface area contains C of 5.0-35.0 atom%.SELECTED DRAWING: None 【課題】ステンレス鋼等の高速連続切削加工に供した場合であっても、その被覆層が優れた靭性を備え、長期の使用にわたって優れた耐チッピング性、耐摩耗性を発揮する被覆工具を提供する。【解決手段】工具基体の表面に、第１層とその上部に第２層を含む複数の層が積層された硬質被覆層を設けた表面被覆切削工具であって、前記硬質被覆層のうち、前記工具基材と接する前記第１層はＴｉＮ層であり、前記工具基体と前記ＴｉＮ層との界面から０．１μｍの範囲内の界面領域における前記ＴｉＮ層を構成するＴｉＮ結晶粒子の平均粒径が３０ｎｍ以下であり、該界面領域には５．０〜３５．０原子％のＣを含むことを特徴とする、表面被覆切削工具。【選択図】なし