Because of the difference of zinc content in brass, the mechanical properties of brass are different. Figure 7 shows the curve of the mechanical properties of brass varying with the difference of zinc content. For alpha brass, with the increase of zinc content, both_b and_increase continuously. For (alpha + beta) brass, room temperature strength continues to improve until zinc content increases to about 45%. If the zinc content is further increased, the strength of the alloy decreases sharply due to the presence of more brittle R phase (solid solution Brass Based on Cu5Zn8 compound). The room temperature plasticity of brass decreases with the increase of zinc content. Therefore, copper-zinc alloys containing more than 45% zinc have no applicable cost. Popular brass is widely used, such as water tank belts, water supply and drainage pipes, medals, bellows, serpentine pipes, condensation pipes, cartridge shells and various shapes of punched products, hardware and so on. With the increase of zinc content from H63 to H59, they can well withstand thermal processing, mostly used in machines and electrical appliances, stamping parts and musical instruments.