Taiwan Chun Bao cobalt tungsten steel ST7: 20 Size :2-6 Hardness: 85.3 Specific Gravity: 13.4 Flexural strength: 270 Uses: 20 straight-through stainless steel screws above the mold. Carbide with high hardness, wear resistance, strength and toughness, heat resistance, corrosion resistance and a series of excellent performance, especially its high hardness and wear resistance, even at 500 ℃ high temperature also remained without deformation, at 1000 ℃ still very high hardness. Carbide is widely used as a tool material, such as turning, milling, planer, drill, boring knives. For cutting cast iron, nonferrous metals, plastics, chemical fiber, graphite, glass, stone and ordinary steel can also be used to cut heat-resistant steel, stainless steel, high manganese steel, tool steel and other difficult to machine materials. Carbide cutting tools are now new carbon steel equal number of times.