Blade is a component easy to be damaged in the filed of mechanism. Its service life directly influences mechanization. According to this problem, our company applies tungsten carbide as the material to make blade, greatly improving its service life. The cemented alloy product is a alloy product made by felting carbide that is hard to melt in metal (such as, tungsten carbide, titanium carbide, tantalum carbide, columbium carbide, vanadium carbide, chrome carbide and so on) with metal or nickel in the method of powder metallurgy.