Ordinary brass is an alloy composed of copper and zinc. Aluminum bronze (QAL7 QAL5) lead bronze ( ZQPB30) etc. When the tin content is less than 5~6%, tin dissolves in copper to form a solid solution, and the plasticity rises when the tin content When it is greater than 5~6%, due to the presence of a Cu31sb8-based solid solution, the tensile strength decreases, so the tin content of the scaled tin bronze is mostly between 3-14%. When the tin content is less than 5%, it is suitable for cold deformation When the tin content is 5~7%, it is suitable for thermal deformation. Copper-nickel binary alloy is called ordinary cupronickel, and copper-nickel alloys with elements such as manganese, iron, zinc and aluminum are called messy cupronickel. China copper tubes manufacturers For example, HPb591 indicates that the mass fraction of copper is 59%, the mass fraction of lead containing the main element is 1%, and the balance is lead brass with zinc. The condition of large wall thickness is not suitable for casting castings that require fine density and good sealing. 2 . Because tin bronze has a wide crystallization temperature and poor fluidity,it is not easy to form condensed shrinkage cavities, but it is easy to form dendritic segregation and scattered shrinkage cavities, and the casting shortening rate is small. In general, single-phase brass is used for cold deformation production and dual-phase brass is used for hot deformation production. If the zinc is continuously increased If the mass fraction is higher, the tensile strength will decrease, and the code of no use value is indicated by 'H + number', H means brass, and the number means copper mass fraction. The copper-based alloy with nickel as the primary added element is silver-white, called cupronickel. When the zinc content is less than 39%, zinc can be dissolved in copper to form a single-phase a, called single-phase brass, which has good plasticity and is suitable for cold, hot and pressurized production. H90 and H80 are single-phase, golden yellow, so they are collectively called golden, called plating, decorations, medals, etc.