Grade: MG80 density 0.8-1.0 Specific Gravity: 14.2 Hardness: 90.5 Flexural strength: 3800 Usage: powder molding in 1923, the German Shileteer tungsten carbide powder added to the 10% to 20% cobalt for bonding agent, invented a new tungsten carbide and cobalt alloy, hardness only to diamond, which is the world's first artificial made of cemented carbide. With this cutting tool made of steel alloy, the blade will wear out quickly, even edge crack. United States in 1929 in the original composition of Schwarzkopf added a certain amount of tungsten carbide and titanium carbide compound, improves the performance of cutting tool steel. This is yet another achievement in the history of carbide.