Imports of high-precision brass band C2700

C2700 imported high-precision brass band brass is an alloy of copper and zinc thereof. If only the copper and zinc composition of the brass called ordinary brass. If a variety of alloy composed of two or more elements of composition called special brass. The copper alloy of lead, tin, manganese, nickel, lead, iron, silicon composition. Brass has strong wear resistance. Special brass special brass called it high strength, hardness, resistance to chemical corrosion. There machining mechanical properties are more prominent. The pull from the brass into a seamless copper tube, soft, strong wear resistance. Seamless brass heat exchangers and condensers can be used for low temperature piping, sea transport pipe. Manufacture of sheet, strip, bars, tubing, casting parts. Copper at 62 to 68 percentage, strong plastic, manufacturing pressure equipment. Overview If multiple alloy is composed of two or more elements called special brass. The copper alloy of lead, tin, manganese, nickel, iron, silicon composition. Brass has strong wear resistance. Special brass special brass called it high strength, hardness, resistance to chemical corrosion. There machining mechanical properties are more prominent. The pull from the brass into a seamless copper tube, soft, strong wear resistance. Seamless brass heat exchangers and condensers can be used for low temperature piping, sea transport pipe. Manufacture of sheet, strip, bars, tubing, casting parts. Copper at 62 to 68 percentage, strong plastic, manufacturing pressure equipment. According brass alloy elements contained in different types of brass is divided into ordinary brass and special brass two. Pressure called deformation processing of brass brass. Brass to zinc as the main element of the copper alloy, with a beautiful yellow, collectively referred to as brass. Cu-Zn binary alloy that ordinary brass, or a simple brass. More than triple brass said the complexity of special brass or brass. Less than 36% zinc brass alloy by solid solution, with good cold working properties, such as 30% zinc brass used to make shells, commonly known as cartridge brass or seventy-three brass. Zinc between 36 to 42% of the brass alloy by solid solution, of which the most commonly used is 40% zinc brass Tiananmen. To improve the performance of ordinary brass, and often add other elements such as aluminum, nickel, manganese, tin, silicon, lead. Brass aluminum can improve the strength, hardness and corrosion resistance, but the plastic lower condenser suitable for sea vessels, and other corrosion-resistant parts. Brass tin can improve the strength and corrosion resistance to seawater, it said the Navy brass, used thermal equipment and ship propellers and so on. Lead can improve the cutting performance of brass; this cutting brass is often used as watch parts. Brass castings used to produce valves and pipe fittings. Brass is an ordinary room organization binary alloy of copper and zinc, zinc content varies greatly, so the room is also very different organization. According Cu-Zn binary state diagram (Figure 6), brass room three organizations: the amount of 35% zinc brass, the microstructure at room temperature by the α single phase solid solution composition, called α Huang copper; zinc content in the range of 36% -46% of the brass, the microstructure at room temperature by the (α + β) two-phase, known as the (α + β) brass (two-phase brass); with zinc more than 46% to 50% of the brass, the microstructure at room temperature consists of only phase β, called β brass. Pressure processing performance α single-phase brass have good ductility (from H96 to H65), able to withstand hot and cold processing, but the α single-phase brass prone to temperature brittle forging and other thermal processing, the specific temperature range containing Zn amount Different vary, generally between 200 ~ 700 ℃. Thus, thermal processing temperature should be higher than 700 ℃. The main reason for the single-phase α brass in the temperature brittle zone in Cu-Zn alloy system α phase region and the existence of Cu3Zn Cu9Zn two ordered compounds, occurs when low-temperature heating and orderly transition of the alloy brittle; other alloy in the presence of trace amounts of lead, bismuth harmful impurities and copper forming low melting point eutectic films distributed in the grain boundary, resulting in intergranular fracture during thermal processing. Practice shows that adding small amounts of cerium can effectively eliminate temperature brittle. Two-phase brass (from H63 to H59), Alloy, in addition to having good elasticity α phase, but also emerged from the electronic compound CuZn-based β solid solution. β phase has a high plasticity at high temperature, low temperature and β 'phase (ordered solid solution) hard and brittle nature. Therefore, (α + β) brass should be forged in the hot state. Zinc is greater than 46% to 50% due to the performance of hard and brittle β brass, pressure can not be processed. Due to the different mechanical properties of brass, zinc, mechanical properties are not the same, FIG. 7 is a brass mechanical properties vary with different zinc curve. For α brass, with the increase in zinc content, σb and δ have constantly increased. For the (α + β) brass, when the zinc content increased about 45%, room temperature strength continues to increase. Ruozai further increase the amount of zinc, since the alloy appeared more brittle r phase (Cu5Zn8 compound-based solid solution), a sharp decrease in strength. (Α + β) brass is always room temperature ductility with increasing zinc content decreases. So more than 45% of zinc and zinc alloy no practical value. Ordinary brass is extremely versatile cistern with water supply and drainage, medals, bellows, snake-like tube, condenser, shells and various forms of complex impulse products, hardware and other items. With increasing zinc content from H63 to H59, they could well withstand thermal processing, machinery and appliances used for various parts, stamping parts and musical instruments, etc.. To improve the brass corrosion resistance, strength, hardness and cutting, etc., in a copper - zinc alloy added a small amount (usually 1% to 2%, a small 3% to 4%, a very few up to 5% to 6 %) tin, aluminum, manganese, iron, silicon, nickel, lead elements, constitute or three or four, or even five yuan alloy, brass is complex, also known as special brass. Brass zinc equivalent coefficient of complex organizations, according to Brass adding elements "zinc equivalent factor" to calculate. Because a small amount of other alloying elements copper and zinc alloy, usually just make Cu-Zn state diagram of α / (α + β) phase region to the left or right. So special brass bodies, usually the equivalent of ordinary brass increase or decrease the zinc content of the tissue. For example, join the organization after a 1% silicon in Cu-Zn alloy, which is equivalent to an increase of 10% zinc alloys in the Cu-Zn alloy. Therefore, the silicon "zinc equivalent" 10. "Zinc equivalent coefficient" Silicon maximum, so that the Cu-Zn-based α / (α + β) phase boundary significantly towards the copper side, which strongly reduce α phase region. Nickel "zinc equivalent coefficient" is negative, that the expansion of α-phase region. Performance of special brass phase α and β solid solution phase is diverse and complex, the larger its strengthening effect, but ordinary brass in the α and β phase is a simple Cu-Zn solid solution strengthening effect lower. Although zinc equivalent rather, the nature of pluralism solid solution with simple binary solid solution is not the same. Therefore, a small amount strengthening pluralism as a way to improve the performance of the alloy. Lead Brass Lead is virtually insoluble in the brass, the state was free distribution of particles on the grain boundaries. Brass lead their organizations α two kinds of (α + β). α lead brass due to adverse effects of lead larger, high-temperature ductility is very low, it can be cold or hot extrusion deformation. (Α + β) lead brass has good plasticity at high temperatures, it can be forged. Tin Brass Brass adding tin, can significantly improve the heat resistance of the alloy, in particular to improve the ability of sea water resistant, so tin brass have "Navy brass," he said. Tin can dissolve copper-based solid solution, from the solid solution strengthening effect. But with the increase of tin-containing alloys brittle r phase (compound CuZnSn) will appear, it is not conducive to plastic deformation of the alloy, so the amount of tin-containing tin brass is generally within the range of 0.5% to 1.5%. Commonly used tin brass have HSn70-1, HSn62-1, HSn60-1 like. The former is the α alloy with high plasticity, can be cold, hot pressure processing. The latter two grades of alloy having (α + β) two-phase structure, and often a small amount of r-phase, room temperature ductility is not high, only deformed in the hot state. Manganese manganese brass have a greater solubility in the solid brass. Brass added 1% to 4% manganese, can significantly improve the strength and corrosion resistance of the alloy, without reducing its ductility. Manganese brass with (α + β) organization, commonly used HMn58-2, cold, hot under pressure processing performance is quite good. Iron Brass: Brass, iron with iron-rich phase precipitation particles as nuclei and grain refinement, and to prevent recrystallization grain growth, thereby improving the mechanical and technological properties of the alloy. Iron brass iron content is usually below 1.5%, the organization is (α + β), with high strength and toughness at high temperatures and good plasticity, cold state can be deformed. Commonly used grades for Hfe59-1-1. Nickel and copper nickel plated to form a continuous solid solution, a significant expansion α-phase region. Brass adding nickel brass can significantly improve the atmosphere and seawater corrosion resistance. Nickel also increases the recrystallization temperature of brass, to promote the formation of finer grains. HNi65-5 Brass organizations have α single phase, with good ductility at room temperature, it can be deformed in the hot state, but the lead content of impurities must be strictly controlled, otherwise the system would seriously deteriorate alloy thermal processing performance. Brass is an alloy of the chemical composition of which is made of copper and zinc. When the zinc content of less than 39% of zinc can be dissolved copper to form a single-phase a, known as single-phase brass, plastic, suitable for hot and cold pressure processing. When zinc is greater than 39%, there are also a single-phase copper and zinc-based b solid solution, called duplex brass, b and the tensile strength of the plastic small rise, only suitable for hot pressure processing if it continues to increase zinc The mass fraction, the tensile strength decreased, no use value code with "H + digital" represents, H represents brass, numbers indicate the mass fraction of copper. Expressed as H68 copper content of 68%, 32% zinc content, brass, cast brass in the former code "Z" word, such as ZH62 Zcuzn38 expressed as zinc content of 38%, the balance being copper cast brass. H90, H80 single-phase, golden yellow, it has a golden co Moreover, he called plating, decorations, medals and so on. H68, H59 belong duplex brass, is widely used in structural parts of electrical appliances, such as bolts, nuts, washers, springs, etc. In general, cold deformation with single-phase brass hot deformation processing phase brass. Special brass joined other alloying elements in the general composition of the brass in the multi-alloy called brass. Often adding elements lead, tin, aluminum, etc., and accordingly may be referred to leaded brass, tin, brass, aluminum, brass. The purpose of alloying elements added. Mainly to improve the tensile strength to improve the process of code: the "H + the main element symbol (except for zinc) + mass fraction of copper + the main element mass fraction + other element mass fraction" he said. Such as: HPb59-1 represents a mass fraction of 59% copper, containing the main element Pb mass fraction of 1%, the balance being zinc-lead brass. Brass, copper purity measurement Measuring brass purity can be measured by Archimedes, measure the volume and quality of the sample, and then calculate the copper brass can be drawn based on the density of copper and zinc density ratio.