Hard metal (also known as Widia, cemented carbide, or tungsten carbide) is a material used in machining that consists of hard tungsten carbide particles embedded in a metal matrix (often cobalt).
Hard metal is produced via a sintering process; essentially, the fine component powders are mixed, pressed, and then heated under high pressure, causing the powder granules to bond together into a single, solid piece.
This means that hard metals are not true metals in the strict sense, but rather carbides (80–95%) bound together by a metal. Tungsten carbide is the material of choice for components subject to wear—such as abrasion, erosion, corrosion, and metal-on-metal seizing.
Consequently, it possesses an extremely high degree of hardness. It also exhibits high compressive strength and resistance to deformation and high temperatures.
These physical characteristics are particularly advantageous for metal-cutting applications. The material ensures a long service life for tools that would otherwise wear out prematurely if made from other materials.