The chemical composition of yellow copper plate
Plain brassIt is an alloy made of copper and zinc. When the amount of zinc is less than 39%, zinc can dissolve in copper, forming single-phase a, called single-phase brass, good plasticity, suitable for cold and hot pressing processing. When the zinc content is greater than 39%, a as well as single-phase copper zinc based B solid solution, called double phase brass, B plastic small and tensile strength increase, only suitable for hot working if continue to increase the mass fraction of zinc, while the tensile strength decreased, the non use value of "H + code table H shows that digital digital representation of brass, copper mass fraction. For example, "H68" means that copper content is 68%, zinc content is 32%, brass, casting brass is in the code before "Z" word, such as ZH62, such as Zcuzn38, said zinc content is 38%, copper casting copper. H90, H80, single phase, golden yellow, so it is called gold, known as coating, decorations, medals and so on. H68 and H59 are dual phase brass, widely used in electrical components, such as bolts, nuts, washers, springs, etc.. In general, cold deformation is processed with single phase brass by hot deformation using dual phase brass.
Depending on the composition, copper alloys are divided into brass and bronze. 1. brass is a copper alloy with zinc as the main alloying element. According to the chemical composition, brass is divided into ordinary copper and special brass two kinds. (1) ordinary brass, ordinary brass is copper, zinc two yuan alloy. As a result of good plasticity, it is suitable for making plates, bars, wires, pipes and deep drawing parts, such as condensing tubes, heat pipes and machinery, electrical parts, etc.. Copper with an average content of 62% and 59% of brass can also be cast, called casting brass. (2) special brass in order to obtain higher strength, corrosion resistance and good casting performance, in the copper zinc alloy to add aluminum, silicon, manganese, lead, tin and other elements, forming a special brass. Such as lead brass, tin brass, aluminum brass, silicon brass, manganese, brass and so on. Lead brass has excellent cutting performance and good wear resistance. It is widely used to make clocks and watches parts, and to make Bush and bush by casting.
Purity measurementThe purity of brass can be measured by Archimedes principle, the volume and quality of the sample are measured, and the proportion of copper in brass is calculated according to the density of copper and the density of zinc.
