| 摘要 |
PROBLEM TO BE SOLVED: To provide WC base cemented carbide having high strength and reduced in variance in transverse rupture strength. SOLUTION: The WC base cemented carbide is characterized in that: it has a composition consisting of, by weight, 5 to 15% Co, 0.4 to 1.5% of one or more elements among Cr, V, Ta and Nb, and the balance WC with inevitable impurities; the average grain size of WC is≤1.2μm; and, when CRav represents a Co minimum concentration dispersion value determined by line analysis using an EPMA (electron probe microanalyzer), CRav≥0.22 is satisfied. COPYRIGHT: (C)2009,JPO&INPIT
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