Grade: RX12UF Brand: Tenda Daye Metal content: 99.96 impurity content: 0.4 for high speed milling grain size of ultrafine grades, especially for mold making. Suitable for low and high alloy steels, titanium alloys, austenitic stainless steel, heat-resistant alloys, glass fiber reinforced plastic. Tungsten steel with a cutting tool made of this alloy steel, 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.