Because of its excellent performances such as good wearing resistance, good corrosion resistance and higher impact resistance. Tungsten carbide bushings is widely used in pump industry, seal industry, bearing industry, petrochemical industry, automobile industry and so on. Especially in pump industry, tungsten carbide bushings often used in water pump, oil pump and other pumps, especially used for high pressure or corrosion resistance pumps, flow restrictors, servo seat, etc. Today, the tungsten carbide bushings has been playing an important role in the field of long working parts material.