The special steel has been widely used in the machinery industry. For instance, the high strength wear-resisting low alloy steel can be applied in the ball screws and slides of the machine tool. It can also be used to forge parts and components of the vehicles and hand tools. Large forged parts, such as the shaft and ring, have been widely used in the wind turbines and large machines. A great number of stainless steel and low alloy wire rods have been used to make screw fasteners. The machinery industry has been closely linked to our daily life.