High-strength brass, the chemical formula is ZCuZn25Al6Fe3Mn3, the mechanical properties are different from the zinc content, the mechanical properties are not the same, the pressure processing performance has good plasticity, can withstand hot and cold processing.
A variety of alloys composed of more than two elements are called special brass. For example, copper alloys composed of aluminum, lead, tin, manganese, nickel, iron and silicon, high-strength brass is one of them. High-strength brass has strong wear resistance, and high-strength brass has strong chemical resistance. In addition, the mechanical properties of cutting processing are also superior. High-strength brass is often made into sheets, strips, rods, pipes, casting parts, etc.
The academic formula is ZCuZn25Al6Fe3Mn3, with a copper content of about 65% and a zinc content of about 24%. Zinc improves brass's strength, hardness and corrosion resistance. There are three types of room temperature tissues of brass: brass with a zinc content of less than 35%, and microstructure at room temperature consists of single-phase α solid solutions, called α brass; It has good plasticity and can withstand hot and cold processing, but it is easy to appear medium temperature brittleness during hot processing such as forging, and its specific temperature range varies with the amount of Zn contained, generally between 200 and 700 °C. Therefore, the temperature during hot processing should be higher than 700 ° C.The zinc content is different, the mechanical properties are also different, for α brass, with the increase of zinc content, σb and δ are constantly increasing. Therefore, copper-zinc alloys with a zinc content of more than 45% have no practical value. The standard high-strength brass Brinell hardness HB is greater than 200, the compressive strength is greater than 600MPa, and the elongation is greater than 10%.