| 摘要 |
PROBLEM TO BE SOLVED: To provide a fine-grained cemented carbide having high strength, having reduced variation in bending strength, and further having stable high hardness. SOLUTION: Disclosed is a fine-grained cemented carbide in which the average grain size of WC is≤0.4μm, and having a composition in which the content of Co is, by weight, 5 to 15%, and including one or more kinds selected from Cr, V, Ta and Nb by 0.4 to 1.5%, and the balance WC with inevitable impurities, and, when the maximum concentration dispersed value of Co obtained by line analysis using an EPMA (Electron Probe Micro Analyzer) is defined as CRav, CRav≥0.52 is satisfied. COPYRIGHT: (C)2009,JPO&INPIT
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