Brass is an alloy of copper and zinc. The simplest brass is a binary alloy of copper and zinc, called simple brass or ordinary brass. Brass with different mechanical properties can be obtained by changing the zinc content in brass. The higher the zinc content in brass, the higher its strength and slightly lower plasticity. The zinc content of brass used in industry does not exceed %. Any higher zinc content will cause brittleness and deteriorate the properties of the alloy. In order to improve certain properties of brass, brass that adds other alloying elements to unary brass is called special brass. Commonly used alloying elements include silicon, aluminum, tin, lead, manganese, iron and nickel. Adding aluminum to brass can improve the yield strength and corrosion resistance of brass, but slightly reduce the plasticity. Brass containing less than % aluminum has good processing, casting and other comprehensive properties. Adding % tin to brass can significantly improve the brass's ability to resist seawater and marine atmosphere 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. 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 castings with smooth surfaces. Brass can be divided into two categories: casting and pressure processing products.
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() All elements will reduce the electrical conductivity and thermal conductivity of the copper rod without exception. All elements are solid dissolved in copper. In the rod, it causes lattice distortion of the copper rod, causing wave scattering when free electrons flow in a directional manner, increasing the resistivity. On the contrary, there is no solid solubility or very few solid solution elements in the copper rod, which is harmful to the copper rod. It has little effect on the electrical and thermal conductivity. It should be noted that the solid solubility of some elements in the copper rod decreases drastically as the temperature decreases, and they precipitate as elemental elements and metal compounds. They can both solid solution and dispersion strengthen the copper rod alloy, and The electrical conductivity does not decrease much, which is an important alloying principle for the study of high-strength and high-conductivity alloys. It should be particularly pointed out here that the alloy composed of the four elements of iron, silicon, aluminum, chromium and copper rods is extremely important for high-strength and high-conductivity alloys. High conductivity alloys due to alloy elements
