Pure
copper is a rose-red metal, and its surface turns purple after forming a copper oxide film, so industrial pure copper is often called red copper or electrolytic copper. The density is 8-9g/cm3, and the melting point is 1083°C. Pure copper has good electrical conductivity and is widely used in the manufacture of wires, cables, brushes, etc.; it has good thermal conductivity and is often used to manufacture magnetic instruments and instruments that must prevent magnetic interference, such as compasses and aviation instruments; it has excellent plasticity and is easy to heat. Press and cold press processing, can be made into tubes, rods, wires, strips, strips, plates, foils and other copper materials.
Brass is an alloy of copper and zinc. The simplest brass is a copper-zinc binary alloy, called simple brass or common brass tube. Brass with different mechanical properties can be obtained by changing the content of zinc in brass. The higher the zinc content in brass, the higher its strength and slightly lower plasticity. The zinc content of brass used in the industry does not exceed 45%. No matter how high the zinc content is, it will cause brittleness and deteriorate the performance of the alloy.
Tin bronze is the earliest alloy used in history. It originally refers to copper-tin alloy. Because of its blue-gray color, it is called bronze. Tin bronze has high mechanical properties, good corrosion resistance, anti-friction and good casting performance; it has low sensitivity to overheating and gas, good welding performance, no ferromagnetism, and small shrinkage coefficient. Tin bronze is more resistant to corrosion than brass in the atmosphere, sea water, fresh water and steam.
