What is currently the hardest grade of hard alloy? What is the hardness?

The hardest grade of hard alloy currently known is an alloy that includes tungsten carbide, which is recognized for its extreme hardness. Tungsten carbide is often used in applications requiring highly wear-resistant materials, such as cutting tools and abrasives. Its hardness can reach up to 9 on the Mohs scale, which is comparable to that of diamonds. In terms of the Rockwell hardness scale, tungsten carbide typically ranges from 85 to 92 HRA (Rockwell A).

Another contender in the category of hard alloys is titanium carbide, which also exhibits high hardness and is used in demanding industrial applications. Titanium carbide has a hardness of approximately 9 to 9.5 on the Mohs scale and around 89 to 94 HRA.

These materials are often utilized in environments where extreme durability and resistance to wear are critical, reflecting their superior hardness characteristics.