CEMENTED CARBIDES

摘要

Cemented carbides which include WC having an average particle diameter of 0.3 µm or less as a hard phase and 5.5 to 15 mass % of at least one iron group metal element as a binding phase, and comprise, in addition to the above hard phase and binding phase, 0.005 to 0.06 mass % of Ti, Cr in a wt ratio relative to the binding phase of 0.04 to 0.2, and the balanced amount of inevitable impurities. Especially, the above cemented carbides contain no Ta. The above cemented carbides are composed of WC in the alloy which forms uniformly fine particles and is effectively inhibited in the growth to a rough WC, which results in the provision of cemented carbides being excellent in both strength and toughness.