Characteristics of Brass
Brass is an alloy of copper and zinc. The simplest brass is a copper-zinc binary alloy, called simple brass or ordinary brass. Brass can be divided into two types of products: casting and pressure processing.
By changing the content of zinc in brass, brass with different mechanical properties can be obtained. The higher the zinc content in brass, the higher its strength and the slightly lower plasticity. The zinc content of brass used in industry is not more than 45%, and even higher zinc content will produce brittleness and deteriorate the alloy performance. In order to improve certain performance of brass, brass with other alloy elements added on the basis of one-yuan brass is called special brass. Commonly used alloy elements are silicon, aluminum, tin, lead, manganese, iron and nickel.
Adding aluminum to brass can improve the yield strength and corrosion resistance of brass, and slightly reduce the plasticity. Brass with less than 4% aluminum has good processing, casting and other comprehensive properties. Adding 1% tin to brass can significantly improve the resistance of brass to seawater and marine atmospheric corrosion, so it is called "navy brass". Tin can also improve the cutting performance of brass. The main purpose of adding lead to brass is to improve the machinability and wear resistance, and lead has little effect on the strength of brass. Manganese brass has good mechanical properties, thermal stability and corrosion resistance; adding aluminum to manganese brass can also improve its performance and obtain a smooth surface casting.