Brass is an alloy of copper and zinc. If it is only composed of copper and zinc, it is called ordinary brass. Brass is often used to make valves, water pipes, connecting pipes for internal and external air conditioners, and radiators.
Mechanical properties of ordinary brass characteristics: Due to the different zinc content in brass, the mechanical properties are also different, and the mechanical properties of brass vary with the zinc content. For brass, the room temperature strength increases with increasing zinc content until the zinc content increases to about 45%. If the zinc content is further increased, the strength decreases sharply. The room temperature plasticity of brass always decreases with the increase of zinc content. Properties of special brass: α phase and β phase in special brass are multi-component complex solid solutions, which have a greater strengthening effect, while α and β phases in ordinary brass are simple Cu-Zn solid solutions, and their strengthening effect is low. . Although the zinc equivalents are equivalent, the properties of multicomponent solid solutions are different from those of simple binary solid solutions. Therefore, a small amount of multi-component strengthening is a way to improve the properties of the alloy.
Lead-brass characteristics: Lead is actually insoluble in brass, and is distributed on the grain boundary in the state of free particles. Lead brass has two types: α and (α+β) according to its organization. Alpha lead brass can only be cold-deformed or hot-extruded due to the harmful effects of lead and low high-temperature plasticity. (α+β) Lead brass has good plasticity at high temperature and can be forged. Tin brass: Adding tin to brass can significantly improve the heat resistance of the alloy, especially the ability to resist seawater corrosion, so tin brass is called "navy brass". Manganese brass characteristics: Manganese has a large solubility in solid brass. Adding 1% to 4% manganese to brass can significantly improve the strength and corrosion resistance of the alloy without reducing its plasticity.
Characteristics of iron brass: In iron brass, iron is precipitated as iron-rich particles, which serve as crystal nuclei to refine the grains, and can prevent the growth of recrystallized grains, thereby improving the mechanical properties and process properties of the alloy. The iron content in iron brass is usually less than 1.5%, and its structure is (α+β), which has high strength and toughness, good plasticity at high temperature, and can be deformed in cold state.
Nickel brass characteristics: Nickel and copper can form a continuous solid solution, which significantly expands the α phase region. The addition of nickel to brass can significantly improve the corrosion resistance of brass in the atmosphere and seawater. Nickel also increases the recrystallization temperature of brass, promoting the formation of finer grains. Brass has strong wear resistance. Special brass is also called special brass, which has high strength, high hardness and strong chemical corrosion resistance. There are also outstanding mechanical properties of cutting. The seamless copper tube drawn from brass is soft and wear-resistant. Brass seamless tubing can be used for heat exchangers and condensers, cryogenic piping, subsea transportation pipes. Manufacture of sheets, strips, bars, tubes, cast parts, etc. The copper content is 62% to 68%, the plasticity is strong, and it is used to manufacture pressure-resistant equipment.
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