1. Copper: copper or red copper or pure copper, there is a certain amount of natural copper in nature. Natural copper without artificial complicated other substances, that is, pure copper, also known as red copper, it has a certain metallic luster and ductility, it is easy to be valued and used. Pure copper is a purple red metal, commonly known as "red copper", "red copper" or "red copper". Pure copper is malleable. Pure copper, the size of a drop of water, can be drawn into filaments up to two kilometres long, or rolled into almost transparent foils larger than a bed.

2. Brass is an alloy of copper and zinc. The simplest brass is a copper-zinc binary alloy called simple brass or plain brass. The brass used in industry now generally contains less than 45% zinc, so most common brass is yellow. Zinc is added to brass to improve mechanical strength and corrosion resistance.

Copper alloys Common in addition to copper, brass, there are bronze, tin bronze is an alloy of copper and tin. Beryllium bronze is an alloy of copper and beryllium. The commonly used phosphorus copper in electrical appliances is an alloy of phosphorus and copper, and so on.

Tin bronze round steel A bronze with tin as the main alloying element. The tin content is generally between 3 and 14%, mainly used for the production of elastic components and wear-resistant parts. The tin content of deformed tin bronze does not exceed 8%, and sometimes phosphorus, lead, zinc and other elements are added. Phosphorus is a good deoxidizer and also improves fluidity and wear resistance. Adding lead to tin bronze can improve machinability and wear resistance, and adding zinc can improve casting performance. This alloy has high mechanical properties, wear resistance and corrosion resistance, easy machining, brazing and welding performance, small shrinkage coefficient, non-magnetic. Bronze lining can be prepared by wire flame spraying and arc spraying. 

Copper is actually pure copper, and brass is an alloy of copper and zinc. Since the price of copper is higher than the price of zinc, the price of pure copper is higher than that of copper-zinc alloy.