Direct sale to import brass C34000 brass C3400 brass band Brass is an alloy composed of copper and zinc. If only by copper, zinc, brass called on ordinary brass. If it is composed of a variety of alloy by more than two kinds of elements called special brass. Such as lead, tin, manganese, nickel, lead, iron, silicon, copper alloy. Brass have a strong wear resistance. Special brass known as special brass, high strength, hardness, corrosion-resistant chemical. There is the cutting of the mechanical properties are more prominent. Pull into a seamless copper from brass, soft, wear resistance and strong. Brass seamless pipe heat exchanger and condenser can be used for low temperature piping, submarine transport tube. Manufacture of sheet metal, Rod, bar, pipe, cast parts. 62% to 68% in copper, plastic, manufacturing, such as pressure devices. 
 Outline 
 If it is composed of a variety of alloy by more than two kinds of elements called special brass. Such as lead, tin, manganese, nickel, iron, silicon, copper alloy. Brass have a strong wear resistance. Special brass known as special brass, high strength, hardness, corrosion-resistant chemical. There is the cutting of the mechanical properties are more prominent. Pull into a seamless copper from brass, soft, wear resistance and strong. Brass seamless pipe heat exchanger and condenser can be used for low temperature piping, submarine transport tube. Manufacture of sheet metal, Rod, bar, pipe, cast parts. 62% to 68% in copper, plastic, manufacturing, such as pressure devices. 
 According to the different types of alloying elements contained in the brass, brass divided into ordinary brass and special brass two. Pressure processing of brass called a deformation of brass. 
 Add elements copper zinc alloy, brass, a beautiful yellow, collectively referred to as brass. Cu, Zn binary alloy that ordinary brass, or a simple brass. Three yuan more than the brass called special brass or complex brass. Lower than 36% zinc brass alloy by solid solution, with good cold working properties, such as zinc 30% of the brass used to make the casings, commonly known as the cartridge case brass, 73 brass. Zinc brass alloy by solid solution between 36 to 42 percent, one of the most commonly used is zinc 40% of the Tiananmen brass. In order to improve the performance of ordinary brass, often add other elements such as aluminum, nickel, manganese, tin, silicon, lead. Aluminum can improve the strength, hardness and corrosion resistance of brass, but the plasticity decreases, suitable for ocean-going vessel condenser and other corrosion-resistant parts. Tin can improve the strength of brass and corrosion resistance to seawater, it said, the Navy brass, as the ship of thermal equipment and propeller. Lead can improve brass cutting; This cutting brass is used as a clock or watch parts. Brass castings used to make valves and pipe fittings. 
 Room temperature, the organization 
 Ordinary brass is a binary alloy of copper and zinc, the zinc content varied greatly, so the room temperature, the organization is also very different. Cu-Zn binary state diagram (Figure 6), the Organization of brass at room temperature, there are three: the amount of zinc in 35% of the brass, the microstructure at room temperature by single-phase alpha solid solution, referred to as α yellow copper; the amount of zinc in the brass within the range of 36% to 46% at room temperature microstructure (α + β) two-phase, known as the (α + β) brass (two-phase brass); containing The zinc content of more than 46 percent to 50 percent of the brass, the microstructure at room temperature only by the β phase, known as β brass. 
 Pressure processing performance 
 α single-phase brass (from H96 to of H65) with good ductility, able to withstand hot and cold processing, but the α single phase brass forging and other thermal processing in temperature brittleness appears specific temperature range of Zn content of different changes, generally between 200 ~ 700 ℃. Therefore, the thermal processing temperature should be higher than 700 ℃. Single-phase alpha brass in the temperature brittle zone mainly due to the ordered compounds in the α phase region of the Cu-Zn alloy the Cu3Zn and Cu9Zn orderly transition in the low-temperature heating, so that the alloy brittle; trace amounts of lead alloy, bismuth harmful impurities and copper, the formation of low melting point eutectic film distribution at the grain boundaries on intergranular rupture, thermal processing. The practice shows that adding a small amount of cerium can effectively eliminate the intermediate temperature brittleness. 
 Two-phase brass (from H63 to H59), Alloy addition to the α phase of plastic good, but also appeared in electronic compound CuZn β solid solution. β phase at high temperatures with high plasticity, hard and brittle nature of the low temperature of β 'phase (ordered solid solution). Therefore, the (α + β) brass forged in the hot state. Zinc large amount of 46% to 50% β-brass due to the performance of hard and brittle, pressure processing. 
 Mechanical properties 
 Brass, zinc content, mechanical properties are not the same, Figure 7 is the mechanical properties of brass vary with the amount of zinc curve. For α brass, with the increase of zinc content, σb and δ have all been increased. (Α + β) brass, the zinc content increased to about 45%, room temperature strength continues to increase. If we further increase the amount of zinc, due to the alloy brittle larger r phase (solid solution based on Cu5Zn8 compounds 
 Body), the intensity decreased dramatically. (Room temperature ductility of the α + β) brass always decrease with increasing zinc content. The zinc content of more than 45% of the copper-zinc alloy is of no practical value. 
 Uses of ordinary brass band, such as water tanks and water supply pipes, medals, bellows, snake-like tube, condenser, shell and all kinds of shape complexity of the washed products, hardware parts. With the increase in zinc content from the H63 and H59, they can well withstand the hot working, used for a variety of mechanical and electrical parts, stamping parts and musical instruments, etc.. 
 In order to improve brass corrosion resistance, strength, hardness and machinability of copper - zinc alloys, adding a small amount (usually 1% to 2%, a small number of 3% to 4%, a very few up to 5 percent to 6 %), tin, aluminum, manganese, iron, silicon, nickel, lead elements, constitute a ternary, quaternary, or even $ 5 alloy is the complexity of brass, also known as a special brass. 
 Zinc equivalent coefficient 
 Brass complex organization, according to the brass elements zinc equivalent coefficient projections. Adding a small amount of other alloying elements in copper and zinc alloy, usually only in the state diagram of Cu-Zn α / (α + β) phase region to the left or right. Therefore, the organization of special brass, usually equivalent to the increase or decrease in the zinc content of the organization in the ordinary brass. For example, in the Cu-Zn alloy to join the organization 1% silicon, which is equivalent to increase of 10% zinc alloy in the Cu-Zn alloy. Silicon "zinc equivalent" of 10. Silicon zinc equivalent coefficient of Cu-Zn in the α / (α + β) phase boundary significantly towards the copper side, that is, strongly reduce the α phase. Nickel zinc equivalent coefficient is negative, that the expansion of the α phase. 
 Performance 
 Special brass in the α phase and β phase is a diverse and complex solid solution, the strengthening effect in the ordinary brass α and β phase of Cu-Zn solid solution strengthening effect lower. Although zinc is quite equivalent, the nature of multi-solid solution with a simple binary solid solution is not the same. Therefore, a small amount of yuan to strengthen a way to improve the performance of alloy. 
 Lead Brass 
 Lead not actually dissolve in brass, was free particle state is distributed in the grain boundary. Α and (α + β) two kinds of lead brass according to their organization. α leaded brass due to the harmful effects of lead and high temperature ductility is very low, so only cold deformation or hot extrusion. Leaded brass (α + β) at high temperature with good plasticity, can be forged. 
 Tin brass 
 Added tin brass, can significantly improve the heat resistance of the alloy, in particular, is to improve the capacity of sea water resistant, so the tin brass naval brass, "said. 
 Tin can integrate into the copper-based solid solution, since the solid solution strengthening effect. With increasing tin content alloys brittle r phase (CuZnSn compounds), plastic deformation is not conducive to alloy tin content of tin brass is generally in the range of 0.5% to 1.5%. 
 Commonly used tin brass HSn70-1, HSn62-1 HSn60-1. Former alpha alloys with high ductility, cold, heat stress processing. The latter two grades of alloy (α + β) two-phase structure, and often a small amount of r phase, the room temperature ductility is not high, only deformation in the hot state. 
 Manganese brass 
 Manganese have a greater solubility in solid brass. Brass added 1% to 4% of manganese, can significantly increase the tensile strength and corrosion resistance without reducing its plasticity. 
 Manganese brass (α + β) organization, commonly used HMn58-2, cold, pressure in the hot state processing performance is quite good. 
 Iron brass: iron brass, iron, iron-rich particles precipitated as a nucleation and grain refinement, and can prevent recrystallization grain growth, thereby enhancing the mechanical and technological properties of the alloy. The iron content in iron brass is usually less than 1.5 percent of their organization (α + β), with high strength and toughness, high temperature and good plasticity, cold state can also be deformed. The common grades Hfe59-1-1. 
 Nickel silver 
 Nickel and copper to form a continuous solid solution, a significant expansion of the α phase. Brass containing nickel can significantly improve the corrosion resistance of brass in the atmosphere and seawater. Nickel also improve the recrystallization temperature of brass, prompting the formation of a finer grain. 
 HNi65-5 nickel-brass single-phase α-organization, very good ductility at room temperature can also be deformed in the hot state, but on the lead content of impurities must be strictly controlled, and whether it has a serious deterioration in the thermal processing properties of the alloy. 
 Brass chemical composition 
 It is an alloy of copper and zinc. 
 When the zinc content of less than 39%, zinc can be dissolved in copper, the formation of single-phase a, said the single-phase brass, plastic, suitable for hot and cold pressurized processing. 
 When zinc is greater than 39%, a single-phase copper-zinc base b solid solution, called duplex brass, b so that the plastic small and tensile strength increased by only suitable for the thermal pressure processing 
 Continue to increase the mass fraction of zinc, the tensile strength decreased, use of 
 Code with the "H + number", H-brass, and numbers indicate the mass fraction of copper. 
 Such as H68 copper content of 68%, zinc 32%, brass, cast brass in the code before the "Z" word, such as ZH62 
 Such as Zcuzn38 zinc content of 38% margin for copper casting brass. 
 H90, H80 single-phase, golden yellow, so the gold of Moreover, he referred to as coatings, decorations, medals. 
 H68, H59 belong to duplex brass, is widely used in the electrical structure, such as bolts, nuts, washers, spring. 
 Under normal circumstances, cold deformation processing phase brass with single-phase brass hot deformation processing. 
 Special brass 
 In multicomponent alloys of other alloying elements are composed of the ordinary brass as brass. Often added elements lead, tin, aluminum, etc., can be described as leaded brass, tin, brass, aluminum brass. The purpose of the alloying element increases. Mainly to improve the tensile strength to improve manufacturability 
 Code: H + main (in addition to zinc) + mass fraction of copper + main add the element mass fraction and element symbols + and the other elements of the mass fraction of. 
 Such as: HPb59-1 copper mass fraction of 59%, with main plus elements such as lead mass fraction of 1%, the margin for lead zinc brass. 

 Brass copper purity measurement 
 Measuring the purity of the brass can be measured by Archimedes' principle, to measure the volume and quality of the sample, according to the density of copper and zinc density calculations can be drawn, the proportion of copper in brass.