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What is the hardest metal in the world?

The hardest known metal alloy, and the hardest known metal in general, is a type of carbon steel, Alloy 1090. With a tensile strength of .84 GPa (122,000 psi) and a yield strength of .64 GPa (67,000 psi), carbon steel is surpassed in hardness only by very hard non-metals, such as ruby, diamond, or aggregated diamond nanorods.

by Dr Vanessa Cheel