FINE-GRAINED CEMENTED CARBIDE

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PROBLEM TO BE SOLVED : To provide fine-grained cemented carbide which prevents occurrence of coarse WC particles and has excellent hardness and strength. SOLUTION : The fine-grained cemented carbide is a WC-based cemented carbide which has a composition consisting of, by mass, 2 to 13% Co, Cr in an amount satisfying 2%≤Cr/Co≤15% with respect to the Co content, one or more rare earth elements selected from Nd, Sm and Y and the balance WC with inevitable impurities and also has an average particle size of WC of ≤0.8 μm. In this cemented carbide, the rare earth elements exist in a state of solid solution in a Co phase, the content of the rare earth elements with respect to the Co content ranges from 0.2 to 2.0 mass%, and the number of coarse WC particles having ≥2 μm particle size is ≤300 pieces/mm2. COPYRIGHT : (C)2008, JPO&INPIT