How about hardness of tungsten carbide rings?

Cemented carbide, also known as tungsten carbide alloy, is a composite material composed of tungsten (W) and carbon (C) and other alloying elements such as cobalt, cobalt nickel, etc. The Mohs hardness of tungsten carbide is usually between 8.5 and 9.5, sometimes even higher. This makes tungsten carbide wear-resistant and scratch-resistant, and harder than many other metals and alloys. Specifically, tungsten carbide is about 10 times harder than gold, 5 times harder than tool steel, and 4 times harder than titanium. This high hardness allows tungsten carbide rings to maintain their shape and gloss for a long time.

Due to their extremely high hardness, tungsten carbide rings are widely used in occasions that require high wear resistance, such as seals, disc gears, instruments, etc. They are called "permanent polishing rings", which means that their gloss and shape can remain unchanged for a long time.

Tungsten carbide generally has good chemical stability and corrosion resistance, and can resist the erosion of most chemicals. Tungsten carbide can still maintain its hardness and structural stability at high temperatures, so it is suitable for use in environments with high temperatures or risks of mechanical wear.

Overall, whether as seals, cutting tools or other demanding applications, tungsten carbide rings can provide excellent performance and long-term stability. Its hardness value is not only reflected in the high value of Mohs hardness, but also verified by its performance in practical applications.