Brass is an alloy composed of copper and zinc. Brass composed of copper and zinc is called ordinary brass. If it is a variety of alloys composed of more than two elements, it is called special brass. Brass has strong wear resistance. Brass is often used to make valves, water pipes, connecting pipes of internal and external units of air conditioners and radiators.EN 10025 S235JR S275JR Carbon10mm Square Steel Bar
Room temperature structure
Ordinary brass is a binary alloy of copper and zinc. Its zinc content varies widely, so its room temperature microstructure is also very different. There are three kinds of microstructure of brass at room temperature: single-phase brass with less than 35% zinc and single-phase brass with less than 35% zinc at room temperature α Solid solution composition, called α Brass; The microstructure of brass with zinc content in the range of 36% ~ 46% at room temperature is composed of（ α+β） Two phase composition, called（ α+β） Brass (two-phase brass); The microstructure of brass containing more than 46% ~ 50% zinc at room temperature is only composed of β Phase composition, called β Brass.
Single phase brass (from H96 to H65) has good plasticity and can withstand hot and cold working, but α Single phase brass is prone to medium temperature brittleness during hot working such as forging, and its specific temperature range varies with the content of Zn, generally between 200 ~ 700 ℃. Therefore, the temperature during hot working shall be higher than 700 ℃. single-phase α The reason for the formation of medium temperature brittle zone of brass is mainly in Cu Zn alloy system α There are two ordered compounds cu3zn and cu9zn in the phase region. When heated at medium and low temperature, the ordered transformation occurs, which makes the alloy brittle; In addition, there are a small amount of harmful impurities of lead and bismuth in the alloy, which form a low melting point eutectic film with copper, which is distributed on the grain boundary, and intergranular fracture occurs during hot working. Practice shows that adding a small amount of cerium can effectively eliminate medium temperature brittleness.Retail buying easy assemble steel structure shed building
Two phase brass (from h63 to H59) has good plasticity in the alloy structure α In addition to the phase, there is also a reaction based on the electronic compound CuZn β Solid solution. β The phase has high plasticity at high temperature and low temperature β′ The phase (ordered solid solution) is hard and brittle. Therefore（ α+β) Brass shall be forged in the hot state. Zinc content greater than 46% ~ 50% β Brass cannot be processed by pressure because of its hard and brittle properties.s shandong province 15-18mm depth corrugated steel sheet Corrugated board