CEMENTED CARBIDE

PROBLEM TO BE SOLVED: To provide cemented carbide having excellent toughness and corrosion resistance. SOLUTION: There is provided (1) a cemented carbide in which a hard phase is composed of WC and a binder phase is composed of a Co-base alloy and in which the content of the Co-base alloy is made to 35 to 55 mass% and the Co-base alloy contains ≥20 mass% Ni and ≥6 mass% Cr, or (2) the cemented carbide composed of the above cemented carbide (1) in which Ni content and Cr content in the Co-base alloy are made to ≥30 mass% and ≥8 mass%, respectively. Further alternatively, there is provided (3) the cemented carbide composed of either of the above cemented carbides (1) and (2) in which the Co-base alloy contains 10 to 25 mass% W. COPYRIGHT: (C)2007,JPO&INPIT