This is an alloy of copper and zinc. When the content of zinc is less than 39%, zinc can be dissolved in copper to form single-phase A, which is called single-phase brass. Good plasticity, suitable for cold and hot pressing. When the content of zinc is more than 39%, there are single-phase A and solid solution B mainly composed of copper and zinc, which is called biphase brass. B reduces plasticity and increases tensile strength, which is only suitable for hot pressing. If the mass fraction of zinc continues to increase and the tensile strength decreases, the useless code is represented by H+ numbers, H stands for brass, and the numbers represent the mass fraction of copper. For example, H68 indicates that the copper content of brass is 68% and the zinc content is 32%, and the cast brass is Z-shaped before the symbol. ZH62, such as Zcuzn38, represents cast brass with 38% zinc content, and the rest is copper. H90 and H80 are single-phase and golden yellow, so they are called gold, called electroplating, decorations, medals, etc. H68 and H59 belong to biphase brass, which are widely used in the structural parts of electrical appliances, such as bolts, nuts, washers and springs. Generally speaking, single-phase brass is used for cold deformation and double-phase brass is used for hot deformation. Category pure copper oxygen-free copper phosphorus oxygen-free copper silver-containing pure copper