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What is the difference between cemented carbide and tungsten steel?

For a long time, many people in the industry believe that cemented carbide is tungsten steel. In fact, there are certain differences between the two. Let’s take a look at the difference between cemented carbide and tungsten steel.

Cemented carbide is made of hard compound of refractory metal and bonding metal through powder metallurgy process, which is an alloy material with extremely high hardness. It has the characteristics of high hardness, high strength, good toughness, excellent wear resistance and heat resistance, especially its high hardness and excellent wear resistance, so that it remains basically unchanged even at a temperature of 500°C , It can still have high hardness at 1000°C, and has certain characteristics of metal ceramics. Commonly used cemented carbides can be divided into three categories according to their composition and performance characteristics: tungsten-cobalt, tungsten-titanium-cobalt, tungsten-titanium-tantalum (niobium), and the most widely used in production are tungsten-cobalt and tungsten-titanium-cobalt Quality alloy.

Tungsten steel, also known as tungsten-titanium alloy, high-speed steel or tool steel. Its hardness is Vickers 10K, second only to diamond, and refers to a sintered composite material composed of at least one metal carbide. The advantage of tungsten steel lies in its high hardness and excellent wear resistance. It can still have a high hardness even at 1000°C, so it is often called the second diamond. The grain size of the carbide component is usually between 0.2-10 microns.

Tungsten steel belongs to cemented carbide, but cemented carbide is not necessarily tungsten steel.

Generally speaking, tungsten steel is smelted by adding tungsten raw materials into molten steel by a steelmaking process, and its tungsten content is generally 15-25%; while cemented carbide is a powder metallurgy process with tungsten carbide as the main body and cobalt or other The bonding metal is sintered together, and its tungsten content is generally more than 80%
Simply put, all alloys with a hardness exceeding HRC65 can be called cemented carbide, so tungsten steel belongs to cemented carbide, but strictly speaking, cemented carbide is not necessarily tungsten steel.


Post time: Nov-18-2021