| CPC B23B 51/0007 (2022.01) [B23B 2222/28 (2013.01)] | 8 Claims |
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1. A cemented carbide consisting of a hard phase consisting of a plurality of tungsten carbide grains; and a binder phase comprising cobalt, wherein
a content of the hard phase in the cemented carbide is 91.5 mass % or more and 97 mass % or less,
a content of the cobalt in the cemented carbide is 3 mass % or more and 8.5 mass % or less,
the hard phase has an average grain size of 0.15 μm or more and 0.50 μm or less,
the binder phase has an average grain size of 0.10 μm or more and 0.25 μm or less,
in a histogram showing a grain size distribution of the hard phase, a number N1 is 7 or more and 10 or less, wherein N1 is the number of classes having a frequency of 50% or more of the maximum frequency Fmax,
the classes on the horizontal axis of the histogram represent the grain sizes of the hard phase, and the classes are 0.05 μm intervals,
the frequencies on the vertical axis of the histogram represent percentages, on number basis, of the hard phases falling within the respective classes, the percentages based on all of the hard phases, and
the binder phase has a ratio of a 10% cumulative grain size D10 on area basis to a 90% cumulative grain size D90 on area basis, D10/D90, of 0.23 or more.
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