WC-Co cemented carbide has unique advantages in both hardness and toughness. Tungsten carbide (WC) itself has high hardness (more than corundum, or aluminum oxide), and at elevated operating temperatures rarely drop its hardness. However, it lacks sufficient toughness, which is essential for the cutting tool performance. In order to take advantage of the high hardness of tungsten carbide, and to improve its toughness, people use the metal-bonded tungsten carbide together, so that it not only has a hardness far exceeding high-speed steel, but also able to withstand the most Machining cutting forces. In addition, it can withstand high cutting temperatures generated by high-speed machining.

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