Lead brass is an extremely important and widely used complex brass with excellent cutting performance and wear resistance. The lead content of lead brass is less than 3%, and a small amount of iron, nickel or tin is often added. Ph exists in the microstructure in a free state, which separates the matrix and makes lead brass have good machinability and friction reduction.
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Lead brass is a complex brass with lead as the main additive element, which is composed of four non-ferrous metals: copper, lead, aluminum and zinc in a certain proportion. Lead rarely dissolves in Cu-Zn alloy, exists as an independent phase in the alloy, and is distributed in grain boundaries and grains in the form of free particles, which not only has lubrication effect, but also can break chips, which can improve the cutting performance and wear resistance of brass.
The machinability of lead brass is directly proportional to the lead content, but when the lead content exceeds 3%, the machinability of copper will not be improved obviously, and the hardness, strength and elongation of brass will decrease. Therefore, the main properties of lead brass can be summarized as wear resistance, corrosion resistance and good toughness.
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