| abstract |
(57) [Summary] [PROBLEMS] To provide a coated cemented carbide tool for milling which can achieve both heat crack resistance and impact strength. SOLUTION: This cutting tool has a cemented carbide composed of a hard phase containing WC and a binder phase containing Co, and a coating layer formed on the surface of the cemented carbide, and satisfies the following conditions. As the hard phase, carbides of metals from groups 4a, 5a and 6a of the periodic table (WC ), At least one selected from the group consisting of nitrides, oxides, and solid solutions thereof, in an amount of 1 to 25% by mass. The content of the binder phase in the cemented carbide is 5 to 15% by mass. The average particle size of WC is 2 μm or more. The value of the coercive force Hc of the cemented carbide is in the range of 140 to 180. C contained in cemented carbide with saturation magnetic quantity of 4πσ of cemented carbide The value (4πσ / Co) divided by the mass% of o is 8 or more and less than 15. Does not contain η phase in cemented carbide. The coating layer contains Al. |