Grade: HS07 Metal content: 99.96 impurity content: 0.4 Application: Suitable for indexable tool submicron grain size of the standard grades. This grade has high hardness, high toughness and good edge stability. Suitable alloy, heat-resistant alloys, aluminum, cast iron, steel and other non-metal materials processing. Past two decades, coated carbide also come out. Sweden in 1969 the successful development of titanium carbide coated tools, the tool substrate is a cobalt-tungsten-titanium carbide or tungsten carbide cobalt, titanium carbide surface but a few microns thickness of the coating, but with the same grade of alloy tool compared 3 times longer service life, cutting speed increased by 25% to 50%. 1970s, the fourth generation has emerged coating tool for cutting difficult to machine materials.