The hardest metal is a matter of definition and can vary depending on the criteria used to measure hardness. However, tungsten carbide is often considered one of the hardest metals known to man.
Tungsten carbide is an extremely hard and dense compound made of tungsten and carbon atoms. It has a high melting point, excellent strength, and exceptional resistance to wear and abrasion.
Diamond is not considered a metal but is often referenced when discussing hardness. It is technically a form of carbon and is the hardest known material overall, surpassing the hardness of any metal.
However, in the context of metals specifically, tungsten carbide is typically regarded as one of the hardest.
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