what is the hardest type of material
â¢ Is metal one of the hardest material in the world? Yes, they are but the hardest material in the world known to mankind is DIAMOND. â¢ What is the hardest metal? 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 nonmetals, such as ruby, diamond, or aggregated diamond nanorods.